THE EXACT RULES
Pressing a square flips that square and its
four orthogonal neighbours (fewer at an edge). Pressing is
never blocked. WIN = every light off. FAIL =
the move budget runs out with lights still on. The budget is
14 / 18 / 28 moves for 3×3, 4×4 and 5×5, which the
prover measures against the true minimum-solution length of every board the generator emits
(worst case seen: 8, 11 and 22). Boards are built by pressing random cells on a
solved board, so a solution always exists; the generator
additionally rejects any board whose GF(2) solve says it cannot be cleared.
Classic minesweeper in three sizes with a guaranteed safe first dig.
Place one tower per row and column so no two can see each other.
Leave a light trail, cut off three hunters and survive for sixty seconds.
Calcudoku: every row and column holds 1..n once, and every cage's arithmetic target is exact. Puzzles are generated with a proven single solution.
Wait for green, then click. Five rounds, no false starts, best time kept.
Hold the station: a rotating turret against eight waves of incoming ships.
One-button timing: hop across seven lanes of drifting logs to the nest.
Place deflectors to bounce the beam into the ring. Every board is solvable.
