iOS Puzzle App
Building
A logic puzzle where you deduce building heights. No guessing required — every puzzle is solvable with logic (deterministic techniques) alone.
Solve with logic, not luck
Every puzzle is guess-free by design. You'll always reach the answer by stacking logical deductions.
Puzzles that match your skill
Harder challenges as your rating climbs. The difficulty auto-adjusts to fit your current skill.
Input that feels effortless
Long-press for numbers, double-tap for notes. Built from the ground up for comfortable phone play.
Endless puzzles
Freshly generated every time, never a fixed set. There's always a new board waiting for you.
Dark mode for late-night solving
Light, dark, or match your system. Pick the look that lets you focus.
Learn techniques, step by step
Lessons for every technique, beginner to advanced, so you can pick up new solving patterns one at a time.