Color Screw 3D

Color Screw 3D is a sorting puzzle built around a hard constraint. You unscrew coloured bolts from a mechanical structure and drop them into matching colour boxes — but each box holds only three, and that limit is what turns a simple sorting task into something you have to think about. The structure itself responds physically. Once a bolt stops supporting a part, that part falls away, which exposes layers underneath that were not visible when you started. So the order you work in matters twice over: it determines whether your boxes overflow, and it determines what you can even reach next. Turning the object to see what is behind it is a necessary part of play rather than a cosmetic flourish.