Tenon Screw Puzzle

Tenon keeps a workshop where nothing is ever glued: every plank, pane and brass plate is held by a screw. Six rooms of the shop wait to be taken apart, from the workbench to the clock tower, and the boxes on the shelf only take one colour each.

Unscrew coloured screws into matching boxes and drop every plate. A falling plate knocks loose the screws it passes. 48 boards in six chapters.

Tap a screw whose head is not covered by another plate. It goes into the open box of its colour on the shelf; when no box of its colour is open it waits in the tray, and jumps into its box once one arrives. A box holds three screws and leaves when full, making room for the next one. A plate with one screw left swings down from it, and a plate with no screws falls. A falling plate knocks loose every free screw it passes over on the plates behind it, as long as that screw's box has room, so one tap can drop plate after plate. Clear every screw from the board. If the tray fills up and no free screw fits a box, use Undo.