The puzzle shelf

Choose a puzzle and start the clock

Five puzzles, three milestones apiece, and the whole board clears at midnight (UTC). Try any of them as a guest; sign in to have points recorded.

Pour coloured beads between tubes until every tube holds a single colour.

Slide the blocks aside and steer the key block out through the gap.

Turn the pipe tiles until water flows from the source to every outlet.

Each press flips a tile and its neighbours. Leave the board dark.

Slide the numbered tiles back into order, one move at a time.

Fair timing: the server clocks every run, and a milestone reached quicker than its minimum time is not paid. Daily limit: 2,500 points.