All the answers here! The main goal in 100 Doors is to escape the room. Using all the possibilities of the device you need to open each of 100 doors and move the doors to the next Level.
Search for hidden objects, solve puzzles and use an items to do this!
Level 3:
There is a knife hidden behind the dragon picture. Tap the picture to make the knife fall on the ground.
Grab the knife.
Tap the key on the ground. The teeth of the key is the solution.
Select the knife in your toolbar and tap the door knob.
You need to reproduce the design of the key. Tap the cylinders this way:
1 2 0 1 2
Middle, Down, Up, Middle, Down
Once this is done, the game won’t tell you it is the right solution. You need to go back and click on the door