This is a different kind of screw puzzle. It's not about taking apart a structure. Instead, there are shapes in layers, usually on a theme, but abstract. You have to move all the screws by color into matching cases, as in many screw games, and removing them all drops the layer off the screen, but it's impossible to know which layers are attached to layers below, and which will get caught on other shapes, which will swing freely when down to one screw, and which will get stuck. Sometimes shapes appear to be in the same layer, for a clue, but it's not always that simple. That's a big part of the fun. Trying to outwit the puzzle.There's some challenge, but it's also relaxing. The one really bad thing is that the sounds usually disappear during an ad. It's not asmr—it's kachuncks on one's own rhythm—but it's really satisfying and silent is a let-down. That helps the challenge, though—trying to finish without opting for an extra case, therefore, not triggering an ad, which can involve a lot of guessing. So that's a good thing. Extra game play items trigger ads, but there are no breaks you don't ask for in the middle of a puzzle, and just the standard between puzzles. It's humane and not annoying, and I'm glad for that much to support the devs.The only other negative is that in low light it's hard to tell green screws from turquoise, red from pink, and even, sometimes, purple from brown. That can be cured by upping the device brightness, if you don't mind the extra light.