Screw Sort Lab

Screw Sort Lab is a calm but challenging sorting puzzle set on a cozy hardware bench. Pour screws between tubes until every tube holds one color.

It looks simple at first, but the rules grow as you go:

• Screw sizes: a screw can only land on one of the same size or bigger.
• Hidden screws: some screws hide under "?" caps until they reach the top.
• Tall tubes: later trays hold five screws per tube.
• Limited undos: fewer as the chapters get harder.

The campaign has 60 handcrafted trays across 6 chapters, with a short lesson before each new rule. After that, Free Bench gives you endless trays.

Earn stars by finishing within the target moves. Score bonuses reward clean pours, playing without hints and fast finishes. Collect badges and beat your best score on every tray.

No timers and no pressure. Just you, the screws and a satisfying click when a tube is complete.

Controls

• Mouse / touch: tap a tube to pick up its top screws, then tap the tube to pour into. You can also drag and drop.
• Keyboard: 1–9, 0 select a tube · Z undo · H hint · R reset tray