Puzzle sets
Each set is a short run of levels picked by difficulty or built around one rule. Every level has a single solution, checked by a solver.
Not sure where to start? Warm-up goes from 5×5 to 8×8 and is the gentlest way to learn the rules. Medium climbs to 9×9. Few threads has only four or five threads on 7×7 and 8×8 boards, so each one runs a long way. Small but tricky stays at 5×5 and 6×6 but leaves no room for guessing. Hardcore is 8×8 and 9×9 with up to nine threads.
Each mechanics set adds one rule: fences between cells, holes the threads go around, bridges where two threads cross, or a board without edges where a thread leaves on one side and comes back on the other. The last set mixes them on small boards. Progress is saved in your browser, and any level opens straight from its preview. New to the game? Read how to play first.
Classic sets
- Warm-up8 levels · 5×5, 6×6, 7×7, 8×8
- Medium8 levels · 6×6, 7×7, 8×8, 9×9
- Small but tricky8 levels · 5×5, 6×6
- Few threads8 levels · 7×7, 8×8
- Hardcore8 levels · 8×8, 9×9