diff --git a/backend/src/controllers/adminController.js b/backend/src/controllers/adminController.js
index 598b69c..c4db1f0 100644
--- a/backend/src/controllers/adminController.js
+++ b/backend/src/controllers/adminController.js
@@ -525,7 +525,7 @@ function getFeatures(_req, res) {
 function updateFeatures(req, res) {
   const allowed = ['crossword', 'hangman', 'pet', 'red_book', 'collection',
                    'flashcards', 'knowledge_map', 'board', 'biochem', 'live_quiz', 'classroom',
-                   'gamification', 'assistant'];
+                   'gamification', 'assistant', 'sim_builder'];
   const updates = req.body;
   const stmt = db.prepare("INSERT OR REPLACE INTO app_settings (key, value) VALUES (?, ?)");
   const getOld = db.prepare("SELECT value FROM app_settings WHERE key = ?");
diff --git a/backend/src/routes/customSims.js b/backend/src/routes/customSims.js
index db1d9e8..13e3a42 100644
--- a/backend/src/routes/customSims.js
+++ b/backend/src/routes/customSims.js
@@ -6,29 +6,35 @@
 const express = require('express');
 const router  = express.Router();
 const { authMiddleware, requireRole } = require('../middleware/auth');
+const { requireFeature } = require('../middleware/features');
 const c = require('../controllers/customSimController');
 
 router.use(authMiddleware);
 
+// «Конструктор симуляций» можно отключить в админке (feature_sim_builder_enabled).
+// Чтение/проигрывание уже сохранённых симуляций остаётся доступным; гейтим только
+// авторинг — создание/правку/удаление/раздачу/клон/связи.
+const gate = requireFeature('sim_builder');
+
 router.get('/',    c.list);
 // @public-by-design: router-level authMiddleware (above) + ownership/published check in handler
 router.get('/:id', c.get);
 // @public-by-design: router-level authMiddleware (above) + ownership/published check in handler
 router.get('/:id/related', c.related);
 
-router.post('/', requireRole('teacher', 'admin'), c.create);
+router.post('/', gate, requireRole('teacher', 'admin'), c.create);
 // @public-by-design: router-level authMiddleware (above) + per-row ownership check in handler
-router.put('/:id',    requireRole('teacher', 'admin'), c.update);
+router.put('/:id',    gate, requireRole('teacher', 'admin'), c.update);
 // @public-by-design: router-level authMiddleware (above) + per-row ownership check in handler
-router.delete('/:id', requireRole('teacher', 'admin'), c.remove);
+router.delete('/:id', gate, requireRole('teacher', 'admin'), c.remove);
 
 // Фаза 6 — раздача классу / клон / курикулумные связи. Мутации — inline
 // requireRole(teacher,admin) + per-row ownership в хендлере.
-router.post('/:id/share',  requireRole('teacher', 'admin'), c.share);
-router.post('/:id/clone',  requireRole('teacher', 'admin'), c.clone);
+router.post('/:id/share',  gate, requireRole('teacher', 'admin'), c.share);
+router.post('/:id/clone',  gate, requireRole('teacher', 'admin'), c.clone);
 // @public-by-design: router-level authMiddleware (above) + per-row ownership check in handler
-router.post('/:id/links',          requireRole('teacher', 'admin'), c.addLink);
+router.post('/:id/links',          gate, requireRole('teacher', 'admin'), c.addLink);
 // @public-by-design: router-level authMiddleware (above) + per-row ownership check in handler
-router.delete('/:id/links/:linkId', requireRole('teacher', 'admin'), c.removeLink);
+router.delete('/:id/links/:linkId', gate, requireRole('teacher', 'admin'), c.removeLink);
 
 module.exports = router;
diff --git a/frontend/js/admin/sections/games.js b/frontend/js/admin/sections/games.js
index 96c2a10..1e25a16 100644
--- a/frontend/js/admin/sections/games.js
+++ b/frontend/js/admin/sections/games.js
@@ -17,6 +17,7 @@
     { key: 'biochem',       label: 'Биохимия',          desc: 'Молекулярный редактор, задачи на построение молекул и реакции',     icon: 'flask-conical'  },
     { key: 'live_quiz',     label: 'Живая викторина',  desc: 'Синхронная викторина в реальном времени для всего класса',          icon: 'radio'          },
     { key: 'classroom',     label: 'Онлайн-уроки (classroom)', desc: 'Синхронные онлайн-уроки с доской и видео',                  icon: 'video'          },
+    { key: 'sim_builder',   label: 'Конструктор симуляций', desc: 'Создание учителем своих интерактивных симуляций (рабочее поле, формулы, физика, графики)', icon: 'pencil-ruler' },
   ];
 
   const FS_FEATURES = [
diff --git a/frontend/sim-builder.html b/frontend/sim-builder.html
index 2811423..5f62851 100644
--- a/frontend/sim-builder.html
+++ b/frontend/sim-builder.html
@@ -189,6 +189,13 @@
   var ip = LS.initPage() || {};
   if (!(ip.isTeacher || ip.isAdmin)) { location.href = '/dashboard'; return; }
 
+  // Фича-гейт: «Конструктор симуляций» можно отключить в админке (feature_sim_builder_enabled).
+  if (LS.loadFeatures) {
+    LS.loadFeatures().then(function (feats) {
+      if (feats && feats.sim_builder === false) { LS.toast && LS.toast('Конструктор симуляций отключён', 'warn'); location.href = '/dashboard'; }
+    }).catch(function () {});
+  }
+
   if (!window.SimEngine || !window.SimExpr || !window.SimBuilder) {
     document.getElementById('sbu-preview').innerHTML =
       '<div style="padding:40px;color:#fff">Движок симуляций не загрузился. Обновите страницу.</div>';
diff --git a/js/api.js b/js/api.js
index 4f19df5..f71eaa2 100644
--- a/js/api.js
+++ b/js/api.js
@@ -860,6 +860,7 @@ async function hideDisabledFeatures() {
     biochem:       ['/biochem', '/biochem-library', '/biochem-reactions'],
     live_quiz:     ['/live-quiz'],
     classroom:     ['/classroom'],
+    sim_builder:   ['/sim-builder', '/sim-builder.html'],
     exam9:         ['/exam9', '/exam9.html'],
     textbooks:     ['/textbooks', '/textbooks.html', '/textbook'],
   };