Flip
One press changes a neighborhood. Light the whole board.
How to play Flip
Your goal is simple: turn on every tile. Each tile is also a switch. Press one and it flips itself plus every orthogonally adjacent tile that is still inside the board. Lit tiles turn off; dark tiles turn on.
The small symbol on every tile is a map of that fixed effect. Interior switches show a five-square cross. A switch on an edge loses the arm outside the board and becomes a four-square T. A corner switch has only two neighbors, so its three-square map is an L.
A useful way to think
Every switch is a yes-or-no choice
Pressing the same switch twice cancels both presses. That means a shortest solution never needs the same switch more than once: for each tile, you only need to decide whether it belongs in the solution.
Track the whole shape
The ripple animation follows every affected tile after a press, making the L, T, or cross easy to follow. Undo and Redo let you test an idea; Clear moves restores this exact puzzle without replacing it with a new one.
Hint preserves the solve
Hint solves the board you actually have now, including any detours you made, and circles one switch from a shortest route forward. It never presses the switch for you.
Board sizes from 3×3 to 20×20
Easy is 3×3, Medium is 4×4, Hard is 5×5, and Expert is 8×8. The game includes 64 verified puzzles. Each par score is checked against every equivalent solution so it represents the true minimum move count, including on the 4×4 and 5×5 boards where multiple solutions can exist. Your unfinished board is saved locally.
Want to go further? Choose Custom to generate any board from 3×3 up to 20×20 on your own device - the par is still solved as a true minimum. Every puzzle also shows a short code under the board; note it down or copy its link and you can rebuild that exact board any time, on any device.
Prefer one shared challenge? Flip Daily deals the same board to everyone on the same calendar date, with a streak for solving day after day.
Frequently asked questions
What is the goal of Flip?
Turn on every tile. Pressing a switch flips that tile and every orthogonally adjacent tile that is still inside the board.
Why do the switch shapes change near the edge?
A switch never reaches beyond the board. Interior switches are crosses, non-corner edge switches are T shapes, and corner switches are L shapes.
Are all puzzles solvable?
Yes. Every included starting board is verified offline, and its par score is the true minimum number of moves. Some board sizes can have more than one equally short solution.
Does Hint make a move for me?
No. Hint recomputes a shortest solution from your current board and circles one valid next switch. You still decide whether to press it.
Can I replay a specific puzzle or play bigger boards?
Yes. Every puzzle shows a short code under the board - enter it later to rebuild that exact board. The Custom option generates boards from 3×3 up to 20×20 on your device, each with a proven minimum-press par.