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 10:

Tap the puzzle on the door. There is 9 pieces

123
456
789

Tap on 2 – 3 – 6 – 9

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