Tile Flip
Five-by-five grid of tiles, some lit. Click any tile to toggle it and its four neighbours (up, down, left, right). Turn every tile dark to clear the level. Sounds simple. Isn't.
What it is
Tile Flip is our version of Lights Out, a 1995 Tiger Electronics handheld toy that turned a maths-classroom exercise (linear algebra over GF(2)) into a pleasant minute-long puzzle. The board is a 5×5 grid. Each tile is either lit (orange) or dark. Clicking a tile toggles it and its four cardinal neighbours. Your job: starting from a partially-lit board, reach a fully-dark board.
How to play
- Click or tap a tile. The tile and its up/down/left/right neighbours all toggle (lit becomes dark, dark becomes lit).
- Goal: every tile dark.
- Levels start easy (a few moves required) and grow longer. Level 1 is solvable in 3 clicks; level 8 takes 12+.
- Solvability is guaranteed. Boards are generated by starting from solved and applying random clicks, so every board is reachable.
- No clock. Take your time.
The trick
Most players try a few clicks, get frustrated, and click randomly. There is a real technique: "chasing the lights" from the top row down. Clicking any tile in row 2 directly below a lit tile in row 1 will turn off the lit tile in row 1, at the cost of changing row 2 and row 3. Sweep this way through rows 1-4. By the time you reach row 5, whatever pattern is left there is the only thing you can fix — and there are only seven possible "row 5 patterns" out of 32 that are solvable from there. If your row 5 doesn't match, you go back and click a precise set of tiles in row 1 from a known lookup table (we can't fit the table on this page, but search "Lights Out top row pattern" and the table is everywhere).
What this scored well on
- Underlying maths. The puzzle is a hidden linear-algebra problem; every board has either 0, 1, or 4 valid solution sets. We use generative shuffling so all our boards have at least one solution. Confidence that "it can be solved" is part of the player experience.
- Honest level design. Difficulty doesn't come from artificial size increases — the grid stays 5×5. Difficulty comes from how scrambled the starting state is.
- No time pressure. A puzzle that wants you to think shouldn't also be punishing you on the clock.
What it gets wrong
Tile Flip plateaus quickly: once you learn "chase the lights", levels stop feeling distinct. We considered adding a 6×6 variant for the back half of the level list and decided against it for batch one — the technique is too transferable. A future issue will introduce wraparound (top connects to bottom, left to right), which breaks the chase-the-lights heuristic and creates a genuinely different puzzle.
Who it's for
Tile Flip is for players who enjoyed the original Lights Out handheld, students of algebra who'd recognise the parity-bit structure, and anyone looking for a quiet 90-second puzzle that doesn't demand reflexes.
Where we'd point you next
If you liked the grid puzzle rhythm, try Sort Quick (#14 — 15-puzzle). If you liked the deduction feel, try Code Crack (#11).
Released · 13 May 2026 · Editor's score 3.9 / 5 · Reviewed by Bill