Setup and opening position
The all-off target is scrambled by a bounded deterministic sequence of legal presses, producing a reachable binary pattern of lit and unlit cells.
Flip Puzzle
Reach the unique all-off board, with all nine binary cells equal to zero after a sequence of cross-shaped flips.
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How to play
Reach the unique all-off board, with all nine binary cells equal to zero after a sequence of cross-shaped flips.
- The all-off target is scrambled by a bounded deterministic sequence of legal presses, producing a reachable binary pattern of lit and unlit cells.
- Press any of the nine cells. Its state flips, as do the states immediately above, right, below, and left when those neighbors exist; diagonal cells never change.
- Reach the unique all-off board, with all nine binary cells equal to zero after a sequence of cross-shaped flips.
Strategy tips
- Because pressing a cell twice cancels itself, reason in press parity and use the top rows to determine which cells must be pressed beneath them.
- Treating the chosen cell as the only one affected quickly undoes progress; always account for the complete plus-shaped neighborhood, especially at edges and corners.
- When only the bottom row remains lit, avoid random presses and use the solver-backed next move, since the remaining parity pattern determines whether earlier rows must change.
Complete guide
Rules, scoring, and strategy
Flip Puzzle is a complete browser implementation with its own versioned rules profile. Turn off every light in a three-by-three grid where pressing one cell toggles that cell and each orthogonally adjacent neighbor at the same time.
Legal moves and game flow
Press any of the nine cells. Its state flips, as do the states immediately above, right, below, and left when those neighbors exist; diagonal cells never change.
Winning and terminal positions
Reach the unique all-off board, with all nine binary cells equal to zero after a sequence of cross-shaped flips. When only the bottom row remains lit, avoid random presses and use the solver-backed next move, since the remaining parity pattern determines whether earlier rows must change.
Practical strategy
Because pressing a cell twice cancels itself, reason in press parity and use the top rows to determine which cells must be pressed beneath them. Treating the chosen cell as the only one affected quickly undoes progress; always account for the complete plus-shaped neighborhood, especially at edges and corners.
Questions players ask
What is the objective in Flip Puzzle?
Reach the unique all-off board, with all nine binary cells equal to zero after a sequence of cross-shaped flips.
Which moves are legal in Flip Puzzle?
Press any of the nine cells. Its state flips, as do the states immediately above, right, below, and left when those neighbors exist; diagonal cells never change.
What should I plan first in Flip Puzzle?
Because pressing a cell twice cancels itself, reason in press parity and use the top rows to determine which cells must be pressed beneath them.