Only the current version so far — new entries appear as the game ships updates.
Each level presents a colorful board held down by several screws. Some screws are on the surface — free to tap. Others are buried under overlapping plates.
You have to study the layout carefully before you make your first move. Tap a screw that's still covered, and nothing happens. Tap the wrong free screw? It may not break the puzzle, but it can lead you down a dead end.
The visuals are soft and easy on the eyes — bright enough to enjoy, calm enough to keep you focused.