diff --git a/packages/lern-model/collections/questions/schema.js b/packages/lern-model/collections/questions/schema.js
new file mode 100644
index 0000000..b6c9b8d
--- /dev/null
+++ b/packages/lern-model/collections/questions/schema.js
@@ -0,0 +1,191 @@
+import _ from 'lodash';
+import { Meteor } from 'meteor/meteor';
+import { Mongo } from 'meteor/mongo';
+import { Class } from 'meteor/jagi:astronomy';
+import Author from '../../behaviors/author.js';
+import Content from '../../schemas/content/schema.js';
+import StaticCollections from '../static.js';
+import log from 'loglevel';
+
+const Questions = new Mongo.Collection('questions');
+
+const RangeSchema = Class.create({
+  name: 'QuestionRange',
+  fields: {
+    min: {
+      type: Number,
+      immutable: true,
+      optional: true,
+    },
+    max: {
+      type: Number,
+      immutable: true,
+      optional: true,
+    },
+  },
+});
+
+const Question = Class.create({
+  name: 'Question',
+  collection: Questions,
+  fields: {
+    description: {
+      type: [Content],
+      validators: [{ type: 'minLength', param: 1 }],
+      default: () => [],
+    },
+    text: {
+      type: String,
+      optional: true,
+    },
+    description: {
+      type: [Content],
+      optional: true,
+    },
+    type: {
+      type: String,
+      validators: [
+        {
+          type: 'choice',
+          param: StaticCollections.QuestionTypes,
+        },
+      ],
+      immutable: true,
+    },
+    answer: {
+      validators: [{ type: 'QuestionAnswer' }],
+      optional: true,
+      immutable: true,
+    },
+    range: {
+      type: [QuestionRange],
+      validators: [{ type: QuestionRange }],
+      optional: true,
+      immutable: true,
+    },
+    sudoku: [Number],
+    level: {
+      type: String,
+      optional: true,
+    },
+    score: {
+      type: Number,
+      optional: true,
+    },
+    options: {
+      type: [Content],
+      validators: [{ type: 'QuestionOptions' }],
+      optional: true,
+    },
+  },
+  helpers: {
+    validateGame(answer) {
+      var conflict = false;
+      var conflictRow = false;
+      for (var row = 0; row < 9; row++) {
+        var cRow = _.fill(new Array(9), false);
+        for (var col = 0; col < 9; col++) {
+          conflictRow = conflictRow || cRow[answer[row * 9 + col] - 1];
+          cRow[answer[row * 9 + col] - 1] = true;
+        }
+
+        log.info('row: ' + row, cRow, conflictRow, _.every(cRow));
+      }
+
+      var conflictCol = false;
+      for (var col = 0; col < 9; col++) {
+        var cCol = _.fill(new Array(9), false);
+        for (var row = 0; row < 9; row++) {
+          conflictCol = conflictCol || cCol[answer[row * 9 + col] - 1];
+          cCol[answer[row * 9 + col] - 1] = true;
+        }
+
+        log.info('col: ' + col, cCol, conflictCol, _.every(cCol));
+      }
+
+      var conflictGrid = false;
+      for (var i = 0; i < 9; i += 3) {
+        for (var j = 0; j < 9; j += 3) {
+          var cGrid = _.fill(new Array(9), false);
+          for (var row = i; row < i + 3; row++) {
+            for (var col = j; col < j + 3; col++) {
+              conflictGrid = conflictGrid || cGrid[answer[row * 9 + col] - 1];
+              cGrid[answer[row * 9 + col] - 1] = true;
+            }
+          }
+
+          log.info('grid: ' + i + ',' + j, cGrid, conflictGrid, _.every(cGrid));
+        }
+      }
+
+      log.info(conflictRow, conflictCol, conflictGrid);
+
+      conflict |= conflictRow || conflictCol || conflictGrid;
+
+      return !conflict;
+    },
+
+    isComplete(answer) {
+      return _.every(answer, a => a && a >= 1 && a <= 9);
+    },
+  },
+  behaviors: {
+    timestamp: {
+      hasCreatedField: true,
+      createdFieldName: 'createdAt',
+      hasUpdatedField: true,
+      updatedFieldName: 'updatedAt',
+    },
+  },
+});
+
+Questions.extend({
+  fields: {
+    answerCount: {
+      type: Number,
+      default: 0,
+    },
+    hitCount: {
+      type: Number,
+      default: 0,
+    },
+    hitRate: {
+      type: Number,
+      default: -1,
+    },
+  },
+  events: {
+    afterInc({ data: { fieldName }, currentTarget: sudoku }) {
+      if (fieldName === 'answerCount' || fieldName === 'hitCount') {
+        const { answerCount, hitCount } = sudoku;
+        sudoku.set('hitRate', hitCount / answerCount);
+      }
+    },
+
+    beforeSave(e) {
+      const contentText = _.join(
+        _.map(
+          _.flatten(_.compact(_.map(this.get('content'), 'text.blocks'))),
+        'text'),
+      ' ') || '';
+      const optionsText = _.join(
+        _.map(
+          _.flatten(_.compact(_.map(this.get('options'), 'text.blocks'))),
+        'text'),
+      ' ') || '';
+
+      this.set('text', _.join([contentText, optionsText], ' '));
+
+      if (this.get('range.min'))
+        this.set('range.min', _.toNumber(this.get('range.min')));
+      if (this.get('range.max'))
+        this.set('range.max', _.toNumber(this.get('range.max')));
+    },
+  },
+});
+
+Author(Question);
+
+Question.RangeSchema = RangeSchema;
+
+export default Question;
diff --git a/packages/lern-model/collections/questions/validators.js b/packages/lern-model/collections/questions/validators.js
new file mode 100644
index 0000000..c4eef95
--- /dev/null
+++ b/packages/lern-model/collections/questions/validators.js
@@ -0,0 +1,80 @@
+import _ from 'lodash';
+import { Validator } from 'meteor/jagi:astronomy';
+import StaticCollections from '../static.js';
+
+const QuestionAnswer = {
+  name: 'QuestionAnswer',
+
+  isValid({ value }) {
+    const { type, options, range } = this;
+    if (type === 'open')
+      return (
+        !_.isNull(value) &&
+        _.isString(value) &&
+        _.inRange(value.length, 4, 10000)
+      );
+    else if (type === 'number')
+      return !(_.isNull(range.min) || _.isNull(range.max))
+        && range.min <= value && value <= range.max && range.min < range.max;
+    else if (type === 'closed')
+      return (
+        !_.isNull(value) &&
+        _.isNumber(value) &&
+        _.inRange(value, 0, options.length)
+      );
+    else if (type === 'sudoku')
+      return (
+        !_.isNull(value) &&
+        _.isArray(value) &&
+        value.length === 81 &&
+        !_.some(value, (v) => v === null || (v <= 0 || v >= 10))
+      );
+    else return false;
+  },
+
+  resolveError({ name }) {
+    return `The field ${name} contains inappropriate options`;
+  },
+};
+
+const QuestionOptions = {
+  name: 'QuestionOptions',
+
+  isValid({ value }) {
+    const { type } = this;
+    if (type === 'number') return _.isNull(value);
+    else if (type === 'open') return _.isNull(value);
+    else if (type === 'closed') {
+      return (
+        !_.isNull(value) &&
+        _.isArray(value) &&
+        value.length > 1
+      );
+    } else return false;
+  },
+
+  resolveError({ name }) {
+    return `The field ${name} contains inappropriate options`;
+  },
+};
+
+const QuestionRange = {
+  name: 'QuestionRange',
+
+  isValid({ value: range }) {
+    const { type } = this;
+    if (type === 'number')
+      return range
+        && !(_.isNull(range.min) || _.isNull(range.max))
+        && (!range.max || range.min < range.max);
+    else return true;
+  },
+
+  resolveError({ name }) {
+    return `The field ${name} contains inappropriate range`;
+  },
+};
+
+Validator.create(QuestionAnswer);
+Validator.create(QuestionOptions);
+Validator.create(QuestionRange);
diff --git a/packages/lern-model/collections/static.js b/packages/lern-model/collections/static.js
index def71be..1c85cf4 100644
--- a/packages/lern-model/collections/static.js
+++ b/packages/lern-model/collections/static.js
@@ -13,6 +13,7 @@ const StaticCollections = {
   TestTimeTypes: ['range', 'none'],
   TestResolutions: ['content', 'sudoku'],
   SudokuLevel: ['easy', 'medium', 'hard'],
+  QuestionTypes: ['sudoku', 'open', 'closed', 'number', 'unanswered'],
 };
 
 export default StaticCollections;