Flip the Lights

Choose Restart this round to replace only the current puzzle with a fresh layout at the same difficulty. Its time, moves and hint use start from zero. Completed rounds and the puzzles ahead stay unchanged. The final result adds the last completed attempt for each round, excluding time spent before a replacement.

Finish within a round’s target for Quick solve, or use the minimum number of moves for Minimum moves. You can earn both. Targets for rounds 1–6 are 12, 20, 30, 45, 65 and 90 seconds. Exceeding a target does not end the game.

After completing all six rounds, your adjusted time is compared separately for each mode. The first completion earns First finish. An improvement of at least 0.1 second earns Personal best. Ties, unfinished games and practice do not update it. Layouts vary, so enjoy this as your own challenge record.

Choose a mode on the result screen and select Play again to start six fresh puzzles in that mode. Your completed result and shared image keep their original mode. Replay the same six puzzles also uses the selected mode and preserves any layouts replaced during that game.

Calm has unlimited moves. Thrifty allows four moves beyond the minimum in each round. Exact requires a minimum-move solution. All three use the same difficulty curve and have no time limit.

A new game generates six puzzles from a fresh code. Recent layouts, including rotated or reflected versions, are avoided where possible. Replay the same puzzles keeps the exact six layouts. Start a new game whenever you like, with no daily restriction.

Every puzzle is checked for a real solution and its minimum move count. Rounds 1–2 use 3×3 boards, rounds 3–4 use 4×4, and rounds 5–6 use 5×5. Later puzzles also require more moves. Any minimum solution is accepted, including alternatives.

Undo presses the last tile again to restore its previous effect, so it consumes another move. Moves are not refunded. You may use one hint per round, adding 20 seconds to adjusted time. You still need to press the suggested tile yourself, using one move.

Adjusted time adds 3 seconds per move beyond the minimum and 20 seconds per hint to actual solve time. Finish all six rounds to earn a completion title.

Titles use adjusted time after all six rounds. A result within 120 seconds with any hint earns Skilled Solver.

Switching off the final light on your last allowed move still counts as success. If any light remains, the challenge ends and its result is saved. Practise the same puzzles starts again from round 1 in Calm mode. Practice is labelled separately and keeps the original challenge result.

Progress and recent records are saved only in your current browser. They may disappear when browser data is cleared and do not sync across devices. If storage is unavailable, you can still play on the current page. Time continues while you leave an active round; waiting between rounds is excluded.