Screw Puzzle

Screw Puzzle is a nuts and bolts puzzle about releasing overlapping plates. Move an exposed screw into an empty, exposed hole. A plate comes off when both of its socket holes are empty, revealing any holes it covered. Play all 99 original assemblies online for free without a download or account.

The challenge is the order of removal and the available parking space for screws. Covered holes cannot be selected, even when they look empty beneath a plate. You win by removing every plate; screws can remain in uncovered board holes. The falling of a freed plate is only an animation; this is a logic puzzle, not a physics simulation.

The first assembly has two plates. Levels 2–20 use three, 21–50 use four, and 51–99 use five. Each plate has two sockets; overlapping branches constrain which lower holes are accessible. The board starts with two empty spare holes. Levels progress by dependency depth first, then by initially blocked sockets; swapping equivalent left/right sockets does not count as a new assembly. Revised records are stored separately.

Every assembly can be cleared by moving each original screw once. The target is 4, 6, 8 or 10 moves, matching the starting screw count. Try to clear it without extra moves. All 99 levels are selectable; completed records stay in this browser when storage is available, while unfinished assemblies reset on reload.