diff --git a/apps/labrinth/migrations/20250523174544_project-versions-environments.sql b/apps/labrinth/migrations/20250523174544_project-versions-environments.sql
new file mode 100644
index 000000000..f3db809e3
--- /dev/null
+++ b/apps/labrinth/migrations/20250523174544_project-versions-environments.sql
@@ -0,0 +1,114 @@
+DO LANGUAGE plpgsql $$
+DECLARE
+    VAR_env_field_id INT;
+    VAR_env_field_enum_id INT := 4; -- Known available ID for a new enum type
+BEGIN
+
+-- Define a new loader field for environment
+INSERT INTO loader_field_enums (id, enum_name, ordering, hidable)
+    VALUES (VAR_env_field_enum_id, 'environment', NULL, TRUE);
+
+INSERT INTO loader_field_enum_values (enum_id, value, ordering, created, metadata)
+    VALUES
+        -- Must be installed on both client and (integrated) server
+        (VAR_env_field_enum_id, 'client_and_server', NULL, NOW(), NULL),
+        -- Must be installed only on the client
+        (VAR_env_field_enum_id, 'client_only', NULL, NOW(), NULL),
+        -- Must be installed on the client, may be installed on a (integrated) server. To be displayed as a
+        -- client mod
+        (VAR_env_field_enum_id, 'client_only_server_optional', NULL, NOW(), NULL),
+        -- Must be installed only on the integrated singleplayer server. To be displayed as a server mod for
+        -- singleplayer exclusively
+        (VAR_env_field_enum_id, 'singleplayer_only', NULL, NOW(), NULL),
+        -- Must be installed only on a (integrated) server
+        (VAR_env_field_enum_id, 'server_only', NULL, NOW(), NULL),
+        -- Must be installed on the server, may be installed on the client. To be displayed as a
+        -- singleplayer-compatible server mod
+        (VAR_env_field_enum_id, 'server_only_client_optional', NULL, NOW(), NULL),
+        -- Must be installed only on a dedicated multiplayer server (not the integrated singleplayer server).
+        -- To be displayed as an server mod for multiplayer exclusively
+        (VAR_env_field_enum_id, 'dedicated_server_only', NULL, NOW(), NULL),
+        -- Can be installed on both client and server, with no strong preference for either. To be displayed
+        -- as both a client and server mod
+        (VAR_env_field_enum_id, 'client_or_server', NULL, NOW(), NULL),
+        -- Can be installed on both client and server, with a preference for being installed on both. To be
+        -- displayed as a client and server mod
+        (VAR_env_field_enum_id, 'client_or_server_prefers_both', NULL, NOW(), NULL),
+        (VAR_env_field_enum_id, 'unknown', NULL, NOW(), NULL);
+
+INSERT INTO loader_fields (field, field_type, enum_type, optional)
+    VALUES ('environment', 'enum', VAR_env_field_enum_id, FALSE)
+    RETURNING id INTO VAR_env_field_id;
+
+-- Update version_fields to have the new environment field, initializing it from the
+-- values of the previous fields
+INSERT INTO version_fields (version_id, field_id, enum_value)
+    SELECT vf.version_id, VAR_env_field_id, (
+        SELECT id
+        FROM loader_field_enum_values
+        WHERE enum_id = VAR_env_field_enum_id
+        AND value = (
+            CASE jsonb_object_agg(lf.field, vf.int_value)
+                WHEN '{ "server_only": 0, "singleplayer": 0, "client_and_server": 0, "client_only": 1 }'::jsonb THEN 'client_only'
+                WHEN '{ "server_only": 0, "singleplayer": 0, "client_and_server": 1, "client_only": 0 }'::jsonb THEN 'client_and_server'
+                WHEN '{ "server_only": 0, "singleplayer": 0, "client_and_server": 1, "client_only": 1 }'::jsonb THEN 'client_only_server_optional'
+                WHEN '{ "server_only": 0, "singleplayer": 1, "client_and_server": 0, "client_only": 0 }'::jsonb THEN 'singleplayer_only'
+                WHEN '{ "server_only": 0, "singleplayer": 1, "client_and_server": 0, "client_only": 1 }'::jsonb THEN 'client_only'
+                WHEN '{ "server_only": 0, "singleplayer": 1, "client_and_server": 1, "client_only": 0 }'::jsonb THEN 'client_and_server'
+                WHEN '{ "server_only": 0, "singleplayer": 1, "client_and_server": 1, "client_only": 1 }'::jsonb THEN 'client_only_server_optional'
+                WHEN '{ "server_only": 1, "singleplayer": 0, "client_and_server": 0, "client_only": 0 }'::jsonb THEN 'server_only'
+                WHEN '{ "server_only": 1, "singleplayer": 0, "client_and_server": 0, "client_only": 1 }'::jsonb THEN 'client_or_server'
+                WHEN '{ "server_only": 1, "singleplayer": 0, "client_and_server": 1, "client_only": 0 }'::jsonb THEN 'server_only_client_optional'
+                WHEN '{ "server_only": 1, "singleplayer": 0, "client_and_server": 1, "client_only": 1 }'::jsonb THEN 'client_or_server_prefers_both'
+                WHEN '{ "server_only": 1, "singleplayer": 1, "client_and_server": 0, "client_only": 0 }'::jsonb THEN 'server_only'
+                WHEN '{ "server_only": 1, "singleplayer": 1, "client_and_server": 0, "client_only": 1 }'::jsonb THEN 'client_or_server'
+                WHEN '{ "server_only": 1, "singleplayer": 1, "client_and_server": 1, "client_only": 0 }'::jsonb THEN 'server_only_client_optional'
+                WHEN '{ "server_only": 1, "singleplayer": 1, "client_and_server": 1, "client_only": 1 }'::jsonb THEN 'client_or_server_prefers_both'
+                ELSE 'unknown'
+            END
+        )
+    )
+    FROM version_fields vf
+    JOIN loader_fields lf ON vf.field_id = lf.id
+    WHERE lf.field IN ('server_only', 'singleplayer', 'client_and_server', 'client_only')
+    GROUP BY vf.version_id
+    HAVING COUNT(DISTINCT lf.field) = 4;
+
+-- Clean up old fields from the project versions
+DELETE FROM version_fields
+    WHERE field_id IN (
+        SELECT id
+        FROM loader_fields
+        WHERE field IN ('server_only', 'singleplayer', 'client_and_server', 'client_only')
+    );
+
+-- Switch loader fields definitions on the available loaders to use the new environment field
+ALTER TABLE loader_fields_loaders DROP CONSTRAINT unique_loader_field;
+ALTER TABLE loader_fields_loaders DROP CONSTRAINT loader_fields_loaders_pkey;
+
+UPDATE loader_fields_loaders
+    SET loader_field_id = VAR_env_field_id
+    WHERE loader_field_id IN (
+        SELECT id
+        FROM loader_fields
+        WHERE field IN ('server_only', 'singleplayer', 'client_and_server', 'client_only')
+    );
+
+-- Remove duplicate (loader_id, loader_field_id) pairs that may have been created due to several
+-- old fields being converted to a single new field
+DELETE FROM loader_fields_loaders
+    WHERE ctid NOT IN (
+        SELECT MIN(ctid)
+        FROM loader_fields_loaders
+        GROUP BY loader_id, loader_field_id
+    );
+
+-- Having both a PK and UNIQUE constraint for the same columns is redundant, so only restore the PK
+ALTER TABLE loader_fields_loaders ADD PRIMARY KEY (loader_id, loader_field_id);
+
+-- Finally, remove the old loader fields
+DELETE FROM loader_fields
+    WHERE field IN ('server_only', 'singleplayer', 'client_and_server', 'client_only');
+
+END;
+$$
diff --git a/apps/labrinth/src/models/v2/projects.rs b/apps/labrinth/src/models/v2/projects.rs
index 35a340f0b..0af1e53fe 100644
--- a/apps/labrinth/src/models/v2/projects.rs
+++ b/apps/labrinth/src/models/v2/projects.rs
@@ -127,7 +127,7 @@ impl LegacyProject {
             .collect();
 
         if let Some(versions_item) = versions_item {
-            // Extract side types from remaining fields (singleplayer, client_only, etc)
+            // Extract side types from remaining fields
             let fields = versions_item
                 .version_fields
                 .iter()
@@ -135,10 +135,11 @@ impl LegacyProject {
                     (f.field_name.clone(), f.value.clone().serialize_internal())
                 })
                 .collect::<HashMap<_, _>>();
-            (client_side, server_side) = v2_reroute::convert_side_types_v2(
-                &fields,
-                Some(&*og_project_type),
-            );
+            (client_side, server_side) =
+                v2_reroute::convert_v3_side_types_to_v2_side_types(
+                    &fields,
+                    Some(&*og_project_type),
+                );
 
             // - if loader is mrpack, this is a modpack
             // the loaders are whatever the corresponding loader fields are
diff --git a/apps/labrinth/src/models/v2/search.rs b/apps/labrinth/src/models/v2/search.rs
index dfc9356b7..1aabaca14 100644
--- a/apps/labrinth/src/models/v2/search.rs
+++ b/apps/labrinth/src/models/v2/search.rs
@@ -102,28 +102,20 @@ impl LegacyResultSearchProject {
 
         let project_loader_fields =
             result_search_project.project_loader_fields.clone();
-        let get_one_bool_loader_field = |key: &str| {
+        let get_one_string_loader_field = |key: &str| {
             project_loader_fields
                 .get(key)
-                .cloned()
-                .unwrap_or_default()
+                .map_or(&[][..], |values| values.as_slice())
                 .first()
-                .and_then(|s| s.as_bool())
+                .and_then(|s| s.as_str())
         };
 
-        let singleplayer = get_one_bool_loader_field("singleplayer");
-        let client_only =
-            get_one_bool_loader_field("client_only").unwrap_or(false);
-        let server_only =
-            get_one_bool_loader_field("server_only").unwrap_or(false);
-        let client_and_server = get_one_bool_loader_field("client_and_server");
+        let environment =
+            get_one_string_loader_field("environment").unwrap_or("unknown");
 
         let (client_side, server_side) =
-            v2_reroute::convert_side_types_v2_bools(
-                singleplayer,
-                client_only,
-                server_only,
-                client_and_server,
+            v2_reroute::convert_v3_environment_to_v2_side_types(
+                environment,
                 Some(&*og_project_type),
             );
         let client_side = client_side.to_string();
diff --git a/apps/labrinth/src/queue/moderation.rs b/apps/labrinth/src/queue/moderation.rs
index 49c2e38c2..3aaa932fc 100644
--- a/apps/labrinth/src/queue/moderation.rs
+++ b/apps/labrinth/src/queue/moderation.rs
@@ -242,7 +242,7 @@ impl AutomatedModerationQueue {
                                 version_specific: HashMap::new(),
                             };
 
-                            if project.project_types.iter().any(|x| ["mod", "modpack"].contains(&&**x)) && !project.aggregate_version_fields.iter().any(|x| ["server_only", "client_only", "client_and_server", "singleplayer"].contains(&&*x.field_name)) {
+                            if project.project_types.iter().any(|x| ["mod", "modpack"].contains(&&**x)) && !project.aggregate_version_fields.iter().any(|x| x.field_name == "environment") {
                                 mod_messages.messages.push(ModerationMessage::NoSideTypes);
                             }
 
diff --git a/apps/labrinth/src/routes/v2/project_creation.rs b/apps/labrinth/src/routes/v2/project_creation.rs
index 540b3a6e1..9a4562430 100644
--- a/apps/labrinth/src/routes/v2/project_creation.rs
+++ b/apps/labrinth/src/routes/v2/project_creation.rs
@@ -158,10 +158,12 @@ pub async fn project_create(
                 .into_iter()
                 .map(|v| {
                     let mut fields = HashMap::new();
-                    fields.extend(v2_reroute::convert_side_types_v3(
-                        client_side,
-                        server_side,
-                    ));
+                    fields.extend(
+                        v2_reroute::convert_v2_side_types_to_v3_side_types(
+                            client_side,
+                            server_side,
+                        ),
+                    );
                     fields.insert(
                         "game_versions".to_string(),
                         json!(v.game_versions),
diff --git a/apps/labrinth/src/routes/v2/projects.rs b/apps/labrinth/src/routes/v2/projects.rs
index 4915b3ad0..dae61bd9c 100644
--- a/apps/labrinth/src/routes/v2/projects.rs
+++ b/apps/labrinth/src/routes/v2/projects.rs
@@ -547,10 +547,12 @@ pub async fn project_edit(
             let version = Version::from(version);
             let mut fields = version.fields;
             let (current_client_side, current_server_side) =
-                v2_reroute::convert_side_types_v2(&fields, None);
+                v2_reroute::convert_v3_side_types_to_v2_side_types(
+                    &fields, None,
+                );
             let client_side = client_side.unwrap_or(current_client_side);
             let server_side = server_side.unwrap_or(current_server_side);
-            fields.extend(v2_reroute::convert_side_types_v3(
+            fields.extend(v2_reroute::convert_v2_side_types_to_v3_side_types(
                 client_side,
                 server_side,
             ));
diff --git a/apps/labrinth/src/routes/v2/version_creation.rs b/apps/labrinth/src/routes/v2/version_creation.rs
index 093f1736b..24f893f22 100644
--- a/apps/labrinth/src/routes/v2/version_creation.rs
+++ b/apps/labrinth/src/routes/v2/version_creation.rs
@@ -105,7 +105,7 @@ pub async fn version_create(
                     json!(legacy_create.game_versions),
                 );
 
-                // Get all possible side-types for loaders given- we will use these to check if we need to convert/apply singleplayer, etc.
+                // Get all possible side-types for loaders given- we will use these to check if we need to convert/apply side types
                 let loaders =
                     match v3::tags::loader_list(client.clone(), redis.clone())
                         .await
@@ -136,53 +136,32 @@ pub async fn version_create(
                     .collect::<Vec<_>>();
 
                 // Copies side types of another version of the project.
-                // If no version exists, defaults to all false.
+                // If no version exists, defaults to an unknown side type.
                 // This is inherently lossy, but not much can be done about it, as side types are no longer associated with projects,
-                // so the 'missing' ones can't be easily accessed, and versions do need to have these fields explicitly set.
-                let side_type_loader_field_names = [
-                    "singleplayer",
-                    "client_and_server",
-                    "client_only",
-                    "server_only",
-                ];
+                // so the 'missing' ones can't be easily accessed, and versions do need to have that field explicitly set.
 
-                // Check if loader_fields_aggregate contains any of these side types
+                // Check if loader_fields_aggregate contains the side types
                 // We assume these four fields are linked together.
                 if loader_fields_aggregate
                     .iter()
-                    .any(|f| side_type_loader_field_names.contains(&f.as_str()))
+                    .any(|field| field == "environment")
                 {
-                    // If so, we get the fields of the example version of the project, and set the side types to match.
-                    fields.extend(
-                        side_type_loader_field_names
-                            .iter()
-                            .map(|f| (f.to_string(), json!(false))),
-                    );
-                    if let Some(example_version_fields) =
+                    // If so, we get the field of an example version of the project, and set the side types to match.
+                    fields.insert(
+                        "environment".into(),
                         get_example_version_fields(
                             legacy_create.project_id,
                             client,
                             &redis,
                         )
                         .await?
-                    {
-                        fields.extend(
-                            example_version_fields.into_iter().filter_map(
-                                |f| {
-                                    if side_type_loader_field_names
-                                        .contains(&f.field_name.as_str())
-                                    {
-                                        Some((
-                                            f.field_name,
-                                            f.value.serialize_internal(),
-                                        ))
-                                    } else {
-                                        None
-                                    }
-                                },
-                            ),
-                        );
-                    }
+                        .into_iter()
+                        .flatten()
+                        .find(|f| f.field_name == "environment")
+                        .map_or(json!("unknown"), |f| {
+                            f.value.serialize_internal()
+                        }),
+                    );
                 }
                 // Handle project type via file extension prediction
                 let mut project_type = None;
diff --git a/apps/labrinth/src/routes/v2_reroute.rs b/apps/labrinth/src/routes/v2_reroute.rs
index a73baac4d..18cf774d6 100644
--- a/apps/labrinth/src/routes/v2_reroute.rs
+++ b/apps/labrinth/src/routes/v2_reroute.rs
@@ -164,69 +164,46 @@ where
     Ok(new_multipart)
 }
 
-// Converts a "client_side" and "server_side" pair into the new v3 corresponding fields
-pub fn convert_side_types_v3(
+/// Converts V2 side types to V3 side types.
+pub fn convert_v2_side_types_to_v3_side_types(
     client_side: LegacySideType,
     server_side: LegacySideType,
 ) -> HashMap<String, Value> {
-    use LegacySideType::{Optional, Required};
-
-    let singleplayer = client_side == Required
-        || client_side == Optional
-        || server_side == Required
-        || server_side == Optional;
-    let client_and_server = singleplayer;
-    let client_only = (client_side == Required || client_side == Optional)
-        && server_side != Required;
-    let server_only = (server_side == Required || server_side == Optional)
-        && client_side != Required;
+    use LegacySideType::{Optional, Required, Unsupported};
+
+    let environment = match (client_side, server_side) {
+        (Required, Required) => "client_and_server", // Or "singleplayer_only"
+        (Required, Unsupported) => "client_only",
+        (Required, Optional) => "client_only_server_optional",
+        (Unsupported, Required) => "server_only", // Or "dedicated_server_only"
+        (Optional, Required) => "server_only_client_optional",
+        (Optional, Optional) => "client_or_server", // Or "client_or_server_prefers_both"
+        _ => "unknown",
+    };
 
-    let mut fields = HashMap::new();
-    fields.insert("singleplayer".to_string(), json!(singleplayer));
-    fields.insert("client_and_server".to_string(), json!(client_and_server));
-    fields.insert("client_only".to_string(), json!(client_only));
-    fields.insert("server_only".to_string(), json!(server_only));
-    fields
+    [("environment".to_string(), json!(environment))]
+        .into_iter()
+        .collect()
 }
 
-// Convert search facets from V3 back to v2
-// this is not lossless. (See tests)
-pub fn convert_side_types_v2(
+/// Converts a V3 side types map into the corresponding V2 side types.
+pub fn convert_v3_side_types_to_v2_side_types(
     side_types: &HashMap<String, Value>,
     project_type: Option<&str>,
 ) -> (LegacySideType, LegacySideType) {
-    let client_and_server = side_types
-        .get("client_and_server")
-        .and_then(|x| x.as_bool())
-        .unwrap_or(false);
-    let singleplayer = side_types
-        .get("singleplayer")
-        .and_then(|x| x.as_bool())
-        .unwrap_or(client_and_server);
-    let client_only = side_types
-        .get("client_only")
-        .and_then(|x| x.as_bool())
-        .unwrap_or(false);
-    let server_only = side_types
-        .get("server_only")
-        .and_then(|x| x.as_bool())
-        .unwrap_or(false);
-
-    convert_side_types_v2_bools(
-        Some(singleplayer),
-        client_only,
-        server_only,
-        Some(client_and_server),
+    convert_v3_environment_to_v2_side_types(
+        side_types
+            .get("environment")
+            .and_then(|x| x.as_str())
+            .unwrap_or("unknown"),
         project_type,
     )
 }
 
-// Client side, server side
-pub fn convert_side_types_v2_bools(
-    singleplayer: Option<bool>,
-    client_only: bool,
-    server_only: bool,
-    client_and_server: Option<bool>,
+/// Converts a V3 environment and project type into the corresponding V2 side types.
+/// The first side type is for the client, the second is for the server.
+pub fn convert_v3_environment_to_v2_side_types(
+    environment: &str,
     project_type: Option<&str>,
 ) -> (LegacySideType, LegacySideType) {
     use LegacySideType::{Optional, Required, Unknown, Unsupported};
@@ -236,30 +213,18 @@ pub fn convert_side_types_v2_bools(
         Some("datapack") => (Optional, Required),
         Some("shader") => (Required, Unsupported),
         Some("resourcepack") => (Required, Unsupported),
-        _ => {
-            let singleplayer =
-                singleplayer.or(client_and_server).unwrap_or(false);
-
-            match (singleplayer, client_only, server_only) {
-                // Only singleplayer
-                (true, false, false) => (Required, Required),
-
-                // Client only and not server only
-                (false, true, false) => (Required, Unsupported),
-                (true, true, false) => (Required, Unsupported),
-
-                // Server only and not client only
-                (false, false, true) => (Unsupported, Required),
-                (true, false, true) => (Unsupported, Required),
-
-                // Both server only and client only
-                (true, true, true) => (Optional, Optional),
-                (false, true, true) => (Optional, Optional),
-
-                // Bad type
-                (false, false, false) => (Unknown, Unknown),
-            }
-        }
+        _ => match environment {
+            "client_and_server" => (Required, Required),
+            "client_only" => (Required, Unsupported),
+            "client_only_server_optional" => (Required, Optional),
+            "singleplayer_only" => (Required, Required),
+            "server_only" => (Unsupported, Required),
+            "server_only_client_optional" => (Optional, Required),
+            "dedicated_server_only" => (Unsupported, Required),
+            "client_or_server" => (Optional, Optional),
+            "client_or_server_prefers_both" => (Optional, Optional),
+            _ => (Unknown, Unknown), // "unknown"
+        },
     }
 }
 
@@ -279,13 +244,14 @@ mod tests {
     };
 
     #[test]
-    fn convert_types() {
-        // Converting types from V2 to V3 and back should be idempotent- for certain pairs
+    fn v2_v3_side_type_conversion() {
+        // Only nonsensical V2 side types cannot be round-tripped from V2 to V3 and back.
+        // When converting from V3 to V2, only additional information about the
+        // singleplayer-only, multiplayer-only, or install on both sides nature of the
+        // project is lost.
         let lossy_pairs = [
             (Optional, Unsupported),
             (Unsupported, Optional),
-            (Required, Optional),
-            (Optional, Required),
             (Unsupported, Unsupported),
         ];
 
@@ -294,10 +260,13 @@ mod tests {
                 if lossy_pairs.contains(&(client_side, server_side)) {
                     continue;
                 }
-                let side_types =
-                    convert_side_types_v3(client_side, server_side);
+                let side_types = convert_v2_side_types_to_v3_side_types(
+                    client_side,
+                    server_side,
+                );
                 let (client_side2, server_side2) =
-                    convert_side_types_v2(&side_types, None);
+                    convert_v3_side_types_to_v2_side_types(&side_types, None);
+
                 assert_eq!(client_side, client_side2);
                 assert_eq!(server_side, server_side2);
             }
diff --git a/apps/labrinth/src/search/indexing/local_import.rs b/apps/labrinth/src/search/indexing/local_import.rs
index c6d2e408c..4a3463572 100644
--- a/apps/labrinth/src/search/indexing/local_import.rs
+++ b/apps/labrinth/src/search/indexing/local_import.rs
@@ -362,7 +362,7 @@ pub async fn index_local(
                 let (_, v2_og_project_type) =
                     LegacyProject::get_project_type(&project_types);
                 let (client_side, server_side) =
-                    v2_reroute::convert_side_types_v2(
+                    v2_reroute::convert_v3_side_types_to_v2_side_types(
                         &unvectorized_loader_fields,
                         Some(&v2_og_project_type),
                     );
diff --git a/apps/labrinth/src/search/indexing/mod.rs b/apps/labrinth/src/search/indexing/mod.rs
index 3f4dcdee9..6ae58eb49 100644
--- a/apps/labrinth/src/search/indexing/mod.rs
+++ b/apps/labrinth/src/search/indexing/mod.rs
@@ -327,11 +327,8 @@ const DEFAULT_DISPLAYED_ATTRIBUTES: &[&str] = &[
     "color",
     // Note: loader fields are not here, but are added on as they are needed (so they can be dynamically added depending on which exist).
     // TODO: remove these- as they should be automatically populated. This is a band-aid fix.
-    "server_only",
-    "client_only",
+    "environment",
     "game_versions",
-    "singleplayer",
-    "client_and_server",
     "mrpack_loaders",
     // V2 legacy fields for logical consistency
     "client_side",
@@ -374,11 +371,8 @@ const DEFAULT_ATTRIBUTES_FOR_FACETING: &[&str] = &[
     "color",
     // Note: loader fields are not here, but are added on as they are needed (so they can be dynamically added depending on which exist).
     // TODO: remove these- as they should be automatically populated. This is a band-aid fix.
-    "server_only",
-    "client_only",
+    "environment",
     "game_versions",
-    "singleplayer",
-    "client_and_server",
     "mrpack_loaders",
     // V2 legacy fields for logical consistency
     "client_side",
diff --git a/apps/labrinth/tests/common/api_v3/request_data.rs b/apps/labrinth/tests/common/api_v3/request_data.rs
index 3e2586f45..f1a6902cb 100644
--- a/apps/labrinth/tests/common/api_v3/request_data.rs
+++ b/apps/labrinth/tests/common/api_v3/request_data.rs
@@ -74,10 +74,7 @@ pub fn get_public_version_creation_data_json(
 
         // Loader fields
         "game_versions": ["1.20.1"],
-        "singleplayer": true,
-        "client_and_server": true,
-        "client_only": true,
-        "server_only": false,
+        "environment": "client_only_server_optional",
     });
     if is_modpack {
         j["mrpack_loaders"] = json!(["fabric"]);
diff --git a/apps/labrinth/tests/common/search.rs b/apps/labrinth/tests/common/search.rs
index daf7a9eb5..0f7559b29 100644
--- a/apps/labrinth/tests/common/search.rs
+++ b/apps/labrinth/tests/common/search.rs
@@ -65,7 +65,7 @@ pub async fn setup_search_projects(
     let id = 0;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[4..6] },
-        { "op": "add", "path": "/initial_versions/0/server_only", "value": true },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "server_only" },
         { "op": "add", "path": "/license_id", "value": "LGPL-3.0-or-later" },
     ]))
     .unwrap();
@@ -80,7 +80,7 @@ pub async fn setup_search_projects(
     let id = 1;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[0..2] },
-        { "op": "add", "path": "/initial_versions/0/client_only", "value": false },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "client_or_server" },
     ]))
     .unwrap();
     project_creation_futures.push(create_async_future(
@@ -94,7 +94,7 @@ pub async fn setup_search_projects(
     let id = 2;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[0..2] },
-        { "op": "add", "path": "/initial_versions/0/server_only", "value": true },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "server_only" },
         { "op": "add", "path": "/name", "value": "Mysterious Project" },
     ]))
     .unwrap();
@@ -109,7 +109,7 @@ pub async fn setup_search_projects(
     let id = 3;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[0..3] },
-        { "op": "add", "path": "/initial_versions/0/server_only", "value": true },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "server_only" },
         { "op": "add", "path": "/initial_versions/0/game_versions", "value": ["1.20.4"] },
         { "op": "add", "path": "/name", "value": "Mysterious Project" },
         { "op": "add", "path": "/license_id", "value": "LicenseRef-All-Rights-Reserved" },
@@ -126,7 +126,7 @@ pub async fn setup_search_projects(
     let id = 4;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[0..3] },
-        { "op": "add", "path": "/initial_versions/0/client_only", "value": false },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "client_or_server" },
         { "op": "add", "path": "/initial_versions/0/game_versions", "value": ["1.20.5"] },
     ]))
     .unwrap();
@@ -141,7 +141,7 @@ pub async fn setup_search_projects(
     let id = 5;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[5..6] },
-        { "op": "add", "path": "/initial_versions/0/client_only", "value": false },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "client_or_server" },
         { "op": "add", "path": "/initial_versions/0/game_versions", "value": ["1.20.5"] },
         { "op": "add", "path": "/license_id", "value": "LGPL-3.0-or-later" },
     ]))
@@ -157,8 +157,7 @@ pub async fn setup_search_projects(
     let id = 6;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[5..6] },
-        { "op": "add", "path": "/initial_versions/0/client_only", "value": false },
-        { "op": "add", "path": "/initial_versions/0/server_only", "value": true },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "client_or_server_prefers_both" },
         { "op": "add", "path": "/license_id", "value": "LGPL-3.0-or-later" },
     ]))
     .unwrap();
@@ -175,8 +174,7 @@ pub async fn setup_search_projects(
     let id = 7;
     let modify_json = serde_json::from_value(json!([
         { "op": "add", "path": "/categories", "value": DUMMY_CATEGORIES[5..6] },
-        { "op": "add", "path": "/initial_versions/0/client_only", "value": false },
-        { "op": "add", "path": "/initial_versions/0/server_only", "value": true },
+        { "op": "add", "path": "/initial_versions/0/environment", "value": "client_or_server_prefers_both" },
         { "op": "add", "path": "/license_id", "value": "LGPL-3.0-or-later" },
         { "op": "add", "path": "/initial_versions/0/loaders", "value": ["forge"] },
         { "op": "add", "path": "/initial_versions/0/game_versions", "value": ["1.20.2"] },
diff --git a/apps/labrinth/tests/files/dummy_data.sql b/apps/labrinth/tests/files/dummy_data.sql
index f3fb1e47d..9866a9d45 100644
--- a/apps/labrinth/tests/files/dummy_data.sql
+++ b/apps/labrinth/tests/files/dummy_data.sql
@@ -67,8 +67,8 @@ VALUES (2, 'Ordering_Negative1', '{"type":"release","major":false}', -1);
 INSERT INTO loader_field_enum_values(enum_id, value, metadata, ordering)
 VALUES (2, 'Ordering_Positive100', '{"type":"release","major":false}', 100);
 
-INSERT INTO loader_fields_loaders(loader_id, loader_field_id) 
-SELECT l.id, lf.id FROM loaders l CROSS JOIN loader_fields lf WHERE lf.field IN ('game_versions','singleplayer', 'client_and_server', 'client_only', 'server_only')  ON CONFLICT DO NOTHING;
+INSERT INTO loader_fields_loaders(loader_id, loader_field_id)
+SELECT l.id, lf.id FROM loaders l CROSS JOIN loader_fields lf WHERE lf.field IN ('game_versions','environment') ON CONFLICT DO NOTHING;
 
 INSERT INTO categories (id, category, project_type) VALUES
     (51, 'combat', 1),
@@ -108,6 +108,6 @@ VALUES (
 INSERT INTO oauth_client_redirect_uris (id, client_id, uri) VALUES (1, 1, 'https://modrinth.com/oauth_callback');
 
 -- Create dummy data table to mark that this file has been run
-CREATE TABLE dummy_data ( 
+CREATE TABLE dummy_data (
     update_id bigint PRIMARY KEY
  );
diff --git a/apps/labrinth/tests/loader_fields.rs b/apps/labrinth/tests/loader_fields.rs
index 7caf8beb4..4b9ac1e2e 100644
--- a/apps/labrinth/tests/loader_fields.rs
+++ b/apps/labrinth/tests/loader_fields.rs
@@ -115,7 +115,7 @@ async fn creating_loader_fields() {
                 Some(
                     serde_json::from_value(json!([{
                         "op": "remove",
-                        "path": "/singleplayer"
+                        "path": "/environment"
                     }]))
                     .unwrap(),
                 ),
@@ -274,12 +274,8 @@ async fn creating_loader_fields() {
                         "value": ["1.20.1", "1.20.2"]
                     }, {
                         "op": "add",
-                        "path": "/singleplayer",
-                        "value": false
-                    }, {
-                        "op": "add",
-                        "path": "/server_only",
-                        "value": true
+                        "path": "/environment",
+                        "value": "client_or_server_prefers_both"
                     }]))
                     .unwrap(),
                 ),
@@ -290,16 +286,17 @@ async fn creating_loader_fields() {
             v.fields.get("game_versions").unwrap(),
             &json!(["1.20.1", "1.20.2"])
         );
-        assert_eq!(v.fields.get("singleplayer").unwrap(), &json!(false));
-        assert_eq!(v.fields.get("server_only").unwrap(), &json!(true));
+        assert_eq!(
+            v.fields.get("environment").unwrap(),
+            &json!("client_or_server_prefers_both")
+        );
         // - Patch
         let resp = api
             .edit_version(
                 alpha_version_id,
                 json!({
                     "game_versions": ["1.20.1", "1.20.2"],
-                    "singleplayer": false,
-                    "server_only": true
+                    "environment": "client_or_server_prefers_both"
                 }),
                 USER_USER_PAT,
             )
@@ -327,8 +324,8 @@ async fn creating_loader_fields() {
                     "value": ["1.20.5"]
                 }, {
                     "op": "add",
-                    "path": "/singleplayer",
-                    "value": false
+                    "path": "/environment",
+                    "value": "client_or_server"
                 }]))
                 .unwrap(),
             ),
@@ -367,16 +364,16 @@ async fn creating_loader_fields() {
         assert!(
             project
                 .fields
-                .get("singleplayer")
+                .get("environment")
                 .unwrap()
-                .contains(&json!(false))
+                .contains(&json!("client_or_server"))
         );
         assert!(
             project
                 .fields
-                .get("singleplayer")
+                .get("environment")
                 .unwrap()
-                .contains(&json!(true))
+                .contains(&json!("client_or_server_prefers_both"))
         );
     })
     .await
@@ -440,10 +437,7 @@ async fn get_available_loader_fields() {
                 fabric_loader_fields,
                 [
                     "game_versions",
-                    "singleplayer",
-                    "client_and_server",
-                    "client_only",
-                    "server_only",
+                    "environment",
                     "test_fabric_optional" // exists for testing
                 ]
                 .iter()
@@ -463,10 +457,7 @@ async fn get_available_loader_fields() {
                 mrpack_loader_fields,
                 [
                     "game_versions",
-                    "singleplayer",
-                    "client_and_server",
-                    "client_only",
-                    "server_only",
+                    "environment",
                     // mrpack has all the general fields as well as this
                     "mrpack_loaders"
                 ]
diff --git a/apps/labrinth/tests/search.rs b/apps/labrinth/tests/search.rs
index e05b13def..b11ad6e0f 100644
--- a/apps/labrinth/tests/search.rs
+++ b/apps/labrinth/tests/search.rs
@@ -52,8 +52,11 @@ async fn search_projects() {
                     vec![1, 2, 3, 4],
                 ),
                 (json!([["project_types:modpack"]]), vec![4]),
-                (json!([["client_only:true"]]), vec![0, 2, 3, 7, 9]),
-                (json!([["server_only:true"]]), vec![0, 2, 3, 6, 7]),
+                (json!([["environment:server_only"]]), vec![0, 2, 3]),
+                (
+                    json!([["environment:client_or_server_prefers_both"]]),
+                    vec![6, 7],
+                ),
                 (json!([["open_source:true"]]), vec![0, 1, 2, 4, 5, 6, 7, 9]),
                 (json!([["license:MIT"]]), vec![1, 2, 4, 9]),
                 (json!([[r#"name:'Mysterious Project'"#]]), vec![2, 3]),