diff --git a/src/is-room-visible/readme.md b/src/is-room-visible/readme.md
index 5bb2d3d..c220197 100644
--- a/src/is-room-visible/readme.md
+++ b/src/is-room-visible/readme.md
@@ -13,5 +13,8 @@ import { isRoomVisible } from '@open-screeps/is-room-visible';
 const observerTargets = Object.keys(Memory.rooms).filter(r => isRoomVisible(r));
 ```
 
+## Related
+- [is-simulation](https://github.com/PostCrafter/open-screeps/tree/master/src/is-simulation)
+
 ## License
 [MIT](../../license.md)
diff --git a/src/is-simulation/index.ts b/src/is-simulation/index.ts
new file mode 100644
index 0000000..78fe0cb
--- /dev/null
+++ b/src/is-simulation/index.ts
@@ -0,0 +1,7 @@
+import { isRoomVisible } from '@open-screeps/is-room-visible';
+
+export const ROOM_SIMULATION = 'sim';
+
+export function isSimulation() {
+	return isRoomVisible(ROOM_SIMULATION);
+}
diff --git a/src/is-simulation/package.json b/src/is-simulation/package.json
new file mode 100644
index 0000000..4c26299
--- /dev/null
+++ b/src/is-simulation/package.json
@@ -0,0 +1,56 @@
+{
+  "name": "@open-screeps/is-simulation",
+  "version": "0.0.0",
+  "description": "Check whether the code is running in simulation",
+  "main": "index.js",
+  "scripts": {
+    "test": "tsc && nyc ava",
+    "prepare": "npm test",
+    "release": "semantic-release"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/postcrafter/open-screeps.git"
+  },
+  "files": [
+    "index.{d.ts,js,js.map}"
+  ],
+  "keywords": [
+    "screeps",
+    "open-screeps"
+  ],
+  "author": "Leo "PostCrafter" Friedrichs <dev@postcrafter.de>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/postcrafter/open-screeps/issues"
+  },
+  "homepage": "https://github.com/postcrafter/open-screeps/src/is-simulation#readme",
+  "dependencies": {
+    "@open-screeps/is-room-visible": "*",
+    "@types/screeps": "^0.0.0"
+  },
+  "devDependencies": {
+    "@semantic-release/git": "^2.0.1",
+    "ava": "^0.24.0",
+    "condition-circle": "^2.0.1",
+    "coveralls": "^3.0.0",
+    "nyc": "^11.3.0",
+    "semantic-release": "^11.0.2",
+    "semantic-release-monorepo": "^3.1.0",
+    "typescript": "^2.6.2"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "release": {
+    "verifyConditions": "condition-circle",
+    "analyzeCommits": "semantic-release-monorepo",
+    "generateNotes": "semantic-release-monorepo",
+    "getLastRelease": "semantic-release-monorepo",
+    "publish": [
+      "@semantic-release/npm",
+      "@semantic-reelase/git",
+      "semantic-release-monorepo/github"
+    ]
+  }
+}
diff --git a/src/is-simulation/readme.md b/src/is-simulation/readme.md
new file mode 100644
index 0000000..d1f30c4
--- /dev/null
+++ b/src/is-simulation/readme.md
@@ -0,0 +1,22 @@
+# is-simulation
+> Check whether the code is running in simulation
+
+## Install
+```sh
+$ npm install @open-screeps/is-simulation
+```
+
+## Usage
+```typescript
+import { isSimulation } from '@open-screeps/is-simulation';
+
+if (isSimulation()) {
+  console.log('Code loaded in simulation.');
+}
+```
+
+## Related
+- [is-room-visible](https://github.com/PostCrafter/open-screeps/tree/master/src/is-room-visible)
+
+## License
+[MIT](../../license.md)
diff --git a/src/is-simulation/test.ts b/src/is-simulation/test.ts
new file mode 100644
index 0000000..b2c47e0
--- /dev/null
+++ b/src/is-simulation/test.ts
@@ -0,0 +1,28 @@
+import test from 'ava';
+
+import { isSimulation, ROOM_SIMULATION } from './index';
+
+declare const global: any;
+
+function stubGame(...rooms: string[]) {
+	type RoomsStub = {
+		[roomName: string]: boolean;
+	};
+
+	global.Game = rooms.reduce((game, roomName) => {
+		game.rooms[roomName] = true;
+		return game;
+	}, {
+		rooms: {} as RoomsStub
+	});
+}
+
+test('Should return true when the room `ROOM_SIMULATION` is visible.', t => {
+	stubGame(ROOM_SIMULATION);
+	t.true(isSimulation());
+});
+
+test('Should return false when the room `ROOM_SIMULATION` is not visible.', t => {
+	stubGame('tutorial');
+	t.false(isSimulation());
+});
diff --git a/src/is-simulation/tsconfig.json b/src/is-simulation/tsconfig.json
new file mode 100644
index 0000000..9536a0f
--- /dev/null
+++ b/src/is-simulation/tsconfig.json
@@ -0,0 +1,3 @@
+{
+  "extends": "../../tsconfig.base.json"
+}