Nine logic puzzles, graded honestly.

A puzzle is only called Expert if a solver using nothing but human techniques actually had to work that hard to finish it. No account, no install.

Pick a game

Each ships with its own generator, exact solver, and technique ladder — every board is solvable by reasoning, never guessing.

The classic 9×9. Five tiers from a gentle Easy to an Extreme that needs chains and fish.

Crossword arithmetic. Fill runs of digits that add to the clue, never repeating one.

Reject duplicate numbers until every row and column is unique — without splitting the board.

Connect the islands with the exact number of bridges each one asks for. Nothing may cross.

Carve islands of the given size out of one connected sea. No pools, no stray lakes.

Draw one closed loop so every numbered cell touches exactly that many edges.

Locate a hidden fleet from the counts along each edge. Ships never touch, not even diagonally.

Place towers so each row and column holds every height once — and the edge clues see the right count.

Skyscrapers with pre-placed heights and interior clues — a longer, more constrained deduction.

The iOS app is in development — no App Store link yet. Everything plays here in the meantime.