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 2:

Move the closet to the right.

Grab the key on the floor.

Tap the key to use it and open the closet.

Grab the shovel

Move the closet back to the left.

Use the shovel to break the 2 wooden pieces blocking the door.

Click here to go back to all the levels