This new Room Escape game is by far the best of the three episodes released so far. Better graphics, an animated introduction, a better melody, a button to turn the sound on/off, and one more time, you need to find 10 keys to open the door and escape the room.
Locked Forever 3 is a short Room Escape game and is also more difficult to solve than the two previous episodes (two keys are tricky to find). Recommended for a 20 minute break.
Update: Locked Forever 3 walkthrough in comment #1.