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 4:

Lift the vase high enough of your screen and let it drop so it breaks.

Grab the key and open the door

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