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A gentle nut-and-bolt sorting puzzle — free to play.
1. Tap a bolt to lift its top nut, then tap another bolt to screw the nut on.
2. A nut only fits an empty bolt or a nut of the same colour.
3. Lock a bolt by stacking three nuts of one colour — locked bolts are done.
✦ 6 solver-verified gentle levels in the Clockwork workshop
✦ Single-nut moves — the exact rule the solver proved solvable
✦ Chunky 3D-look hex nuts and threaded bolts, crisp on any screen