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they are slide puzzles, you need that empty spot to slide the tiles into place.

Bonfie needs to be activated first by buying the screwdriver in the shop and then using the vents to get to the arcade, then in the next night she will spawn there.

There is also a scene which needs the puzzle in the main area to be solved.

the fuse can be found in the staff locker room in the locker (back right of the room). once the power goes out head to the electrical room and open the fuse box to place it in.

Hope this helps