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 26:

Grab the saw on the ground.

Use it to cut the thumb of the dead arm.

Use the thumb on the fingerprint reader on the door

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