You Must Escape is a point and click style puzzle game from mobest media for the Android. If you are new to this type game, let me explain to you how this is played. Your goal is to open the exit door but first you must find the key by solving different kinds of puzzles inside the room. Sometimes you have to find codes that will open secret compartments containing items that will lead you to the next puzzle or the final key that will open the door.
Here's You Must Escape Level 13 walkthrough which will guide you how to beat this particular level.