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!
Solution :
In this level, you need to load the gun and shoot the key above the door with the gun.
Take the powder and tap the gun.
Tap the bullet and tap the gun.
Tap the starter rod and tap the gun. Move up and down constantly to push the bullet correctly in the gun.
When the gun is in your inventor, shoot the key.