Lights Out: How to Turn Every Light Off
Lights Out looks like it should be a game of trial and error - you poke at a grid of glowing tiles, watch the pattern scramble, and hope it eventually goes dark. It rarely does on its own. But there is a clean, repeatable method underneath the chaos, and once you learn it you can clear most boards in one careful pass with no guessing at all. This guide explains the two facts that make the puzzle predictable, then teaches you the "chase the lights" technique and how to read the leftover bottom row to fix your very first taps.
How the puzzle works
Every board is a grid of lights, each either on or off. When you tap one tile, it flips - on becomes off, off becomes on - and so do its orthogonal neighbours: the tiles directly above, below, left, and right of it. Diagonals are never touched. Your single goal is to reach a board where every light is off.
The reason a casual approach fails is that one tap rarely helps just one tile. Flip a light to turn off its neighbour and you have probably switched on three others. So the puzzle isn't really about chasing individual lights by hand - it's about choosing a set of taps whose combined effect leaves the whole grid dark. The good news is that finding that set is far simpler than it looks, because of two quirks built into the rules.
Order never matters, and never tap twice
Here is the first quirk, and it is the one that frees you from panic. The order in which you make your taps has no effect on the final board. Tapping the top-left tile and then the centre lands you in exactly the same state as tapping the centre first and then the top-left. Each tile's final on/off state depends only on how many of the taps surrounding it happened in total, and addition doesn't care about order. So you can plan your taps in any sequence you like and carry them out in any sequence you like.
The second quirk is even more useful. Tapping the same tile twice cancels out completely. A tile flips with the first tap and flips right back with the second, and so does every neighbour, returning that whole little cross to where it started. Two taps on one tile equal zero taps. That means a perfect solution never needs to tap any tile more than once - every tile is either tapped exactly once or left alone. Your entire job, then, is to decide for each tile a single yes-or-no: do I tap it, or not? There is no clever sequence to discover and no tile worth pressing repeatedly.
Try it yourself: open a fresh board in Mochi Lights, tap any tile twice in a row, and watch the grid snap exactly back to how it was. That little experiment is the whole theory in one move - it shows you that taps simply add up, so all you are ever choosing is which tiles to tap once.
Chase the lights down the grid
Those two facts unlock a wonderfully mechanical method called chasing the lights. The idea is to clear the board one row at a time, from the top down, by using each row of taps to switch off the lights in the row above it.
Start by ignoring the top row entirely - don't tap anything in it yet. Look at the top row's lights, and on the second row, tap the tile that sits directly beneath each top-row light that is still on. Because tapping a tile flips the one above it, every light in the top row goes dark. You may have scrambled rows two and three in the process, and that is fine - you only care that the top row is now clean.
Now repeat the move going down. With the top row settled, look at row two: for every light still on there, tap the tile directly below it in row three. The top row stays off (you are not touching it), and row two clears. Keep walking down the grid the same way - each row you tap exists only to switch off the lights stranded in the row above. By the time you press into the bottom row, every row except the last will be dark.
Reading the leftover bottom row
When the chase reaches the bottom, one of two things happens. Either the last row is already all off - in which case the board is solved and you are done - or a handful of lights remain stuck along the bottom with no row beneath them to clear with. Don't tap at them randomly; that only reseeds the mess. The leftover bottom-row pattern is actually a precise message telling you what you should have tapped in the top row before you ever started chasing.
The fix is a fixed lookup. For a standard 5x5 board, each possible leftover bottom pattern corresponds to a specific set of top-row tiles to press first. To use it: note exactly which bottom lights are stuck, reset the board to the starting layout, tap the matching top-row tiles, and then run the chase from the top as before. This time the chase resolves the whole grid, bottom row included. You can keep a small reference of the common 5x5 patterns, or simply derive it once by experimenting: clear by chasing, see what the bottom leaves you, and learn which opening top-row taps make that leftover vanish.
The deep reason this works ties back to the two quirks. Because order doesn't matter and double-taps cancel, your top-row choices and the forced chase that follows combine cleanly, and only a few top-row "free choices" actually change the bottom-row outcome. Adjusting those opening taps is the single lever that controls whether the bottom row ends dark.
A clean solving routine
Put it together and you have a method that clears a standard board without guessing:
- Plan, don't poke. Remember each tile is a one-time yes-or-no tap and order is irrelevant, so you are choosing a set, not a sequence.
- Chase once to scout. Leave the top row alone and chase top-to-bottom, each row's taps clearing the row above it.
- Read the bottom. If the bottom row is dark, you have already won. If not, note exactly which bottom lights are still on.
- Set the top row. Reset to the start, then tap the top-row tiles that match the leftover bottom pattern.
- Chase again. Run the same top-to-bottom chase. With the right opening, the bottom row now clears too and the board goes fully dark.
Common mistakes to avoid
Most failed boards come from a few habits that the two quirks quietly forbid. Watch for these:
- Tapping the same tile again "to fix it." A second tap on a tile undoes the first entirely - you have spent two moves to go nowhere. If a region looks wrong, the answer is a different tile, never the same one twice.
- Worrying about order. Stalling over which tap to make first wastes effort. The grid only counts how many taps each tile receives, so press your planned set in whatever order is comfortable.
- Chasing into the top row. The chase works because you never disturb a row you have already cleared. If you tap in the top row mid-chase, you reopen lights you just settled.
- Stabbing at the leftover bottom lights. When the chase strands lights on the bottom, tapping at them directly scrambles the board. Treat that pattern as information about your opening taps, not as a place to keep poking.
Build the instinct: the chase becomes automatic faster than you would expect, so play a few short boards in Mochi Lights back to back. Once your hand knows to leave the top row alone and sweep downward, you will read the leftover bottom pattern at a glance and fix it on the second pass.
Where to go next
The quickest way to make the chase second nature is to clear boards until your hand does it without thinking - leave the top row, sweep down, read the bottom, set the opening, and sweep again. If you like puzzles where a tidy rule turns apparent chaos into a sure thing, you will feel right at home with the logic guides below, from solving Sudoku to untangling a sliding puzzle.