100 Doors Incredible, from ZENFOX GAMES
All the answers here! The new puzzle game you have to go through many exciting levels by solving a fascinating puzzles.
Solution for level 80 :
In this level you need to combine 2 parts of the key before using it.
Open door #1
Tap the ?
Tap the pink triangle.
Open door number 4 and combine the key with the master.
Drag the complete key on the key hole.