How to play
Click any cell to toggle it. The clicked cell flips state (on becomes off, off becomes on) as do its four orthogonal neighbours. Continue clicking to reach the all-off state. The minimum-click solution is computed and displayed after each win.
Game features
- Twenty-five hand-designed starting patterns
- Random-pattern generator producing only solvable configurations
- Minimum-click solution displayed after each win
- Click counter rewards efficient solving
- Three difficulty modes from sparse to dense initial patterns
- Daily challenge with shared seed
Editor review
Lights Out is the puzzle where you turn off all the lights on a 5x5 grid. Tap a cell, it toggles, plus all four orthogonally adjacent cells also toggle. The challenge is finding the sequence of taps that produces an all-off state. Tiger Electronics released the handheld original in 1995, and the puzzle has been ported to nearly every computing platform since.
Honestly, Lights Out is one of my favourite puzzles to teach. The underlying math is linear algebra over GF(2), and once you see the connection (each cell is a variable, each tap is a vector, the solved state is the zero vector, you're solving Ax = b mod 2), the puzzle becomes pure structure-recognition. I've actually used it as a vehicle for explaining matrix-equation reasoning to advanced students.
The implementation here is fine. Classic 5x5 grid, optional difficulty modes that use larger grids, a "show me the answer" button that displays the optimal solution, plus a tutorial that walks you through how the structure works without spoiling the solution. The optimal solution is unique (a property the puzzle has thanks to its underlying linear-algebra structure), which is worth knowing.
Three-and-a-half stars. Pleasant implementation of a puzzle I find more interesting than most players probably do. The half-star reservation is that the difficulty curve from the basic 5x5 to the larger grids isn't well-tuned, and you skip from "solvable in a minute" to "takes an hour" without much middle ground.
Math tutor turned freelance writer. Reviews puzzle and logic games, mostly the ones with an obvious right answer she got wrong on the first three tries.
Frequently asked questions about Lights Out
How do I play Lights Out?
Click any cell to toggle it. The clicked cell flips state (on becomes off, off becomes on) as do its four orthogonal neighbours. Continue clicking to reach the all-off state. The minimum-click solution is computed and displayed after each win.
Is Lights Out free to play in my browser?
Yes. Lights Out runs free in any modern browser. No installation, no signup, no payment required. Click the play button to load the game.
Does Lights Out work on mobile devices?
Lights Out runs in mobile browsers on iOS and Android with touch controls. Most puzzle games on FinanceMass support both desktop and mobile, though precision-heavy titles tend to play better on desktop with a keyboard or gamepad.
Who reviewed Lights Out on FinanceMass Arcade?
Maya Brennan reviewed Lights Out. Their full editor review appears above and their other coverage is available on their author profile.
Where can I find more games like Lights Out?
More puzzle titles are available on the Puzzle category page. Every game on FinanceMass has been played and reviewed by one of our three reviewers before publication.