Lights Out
Lights Out is a classic 5x5 switch puzzle: press a tile and its orthogonal neighbors to turn every light off.
World and Mission
The 5×5 board is a compact logic puzzle. Each press changes a cross of lights, so solving one spot can change nearby work.
Every attempt starts with the same fixed pattern. Clear it, review your move count, then replay to test another route.
How the Systems Work
Pressing a tile switches that tile and its existing neighbors above, below, left, and right. Corners affect three cells, edges four, and interior tiles five.
The puzzle ends when all 25 lights are off. Hint highlights a suggested press without making it; Undo restores the board and move count from before your last press.
Start Game opens the board directly. New Puzzle and Replay restore the same opening pattern; the result offers Replay, Menu, and Close. The best move count and preferences are stored in this browser.
How to Play
- Select Start Game to open the fixed 5×5 board.
- Press a tile and check every light in the cross that changed.
- Use Hint to see one suggested press, or Undo to restore your last position and move count.
- Switch off every light. Check the result and replay the same opening to try fewer moves.
Strategy Tips
- A corner press affects three cells, an edge press four, and an interior press five. Check the whole cross before choosing.
- Try clearing rows from top to bottom by pressing below lit cells. If the bottom row remains lit, change your first-row choices on the next attempt.
- Pressing the same tile twice restores the light pattern but adds two moves; Undo restores the earlier move count too.
Campaign and Difficulty Growth
The opening pattern and 5×5 rules stay the same on every attempt; there are no random boards or unlockable levels.
Compare solved move counts to improve your route. There is no timer, account, or purchase gate.
Developer Design Note
Lights Out uses the shared Classic Logic Lab screen flow, a responsive 5×5 board, a fixed solvable opening, advisory Hint, reversible Undo, a solved result, and browser-local settings and best moves.
Player and Save Information
Lights Out is a general-audience browser puzzle. No account or purchase is required. Preferences and the best move count stay in this browser and may disappear if site data is cleared.
FAQ
- How does a press work?
- It toggles the selected tile and each orthogonal neighbor that exists.
- What is the goal?
- Turn every light off.
- Is progress saved?
- Preferences and any available best result stay only in this browser.
- Does Hint solve the puzzle?
- No. Hint marks one legal candidate without playing it; you still choose whether to press it.
- How can I plan this online light-switch puzzle?
- Read the whole cross before pressing: a corner changes three cells, an edge four, and an interior cell five. One method is to work down the board, pressing directly below a lit cell to clear the row above. If lights remain in the bottom row, reconsider the first-row presses; this method does not guarantee that every starting choice works.
- Is pressing the same cell twice the same as Undo?
- Two presses on the same cell restore the original light pattern but add two moves. Undo instead restores the previous board and its move count. Use Undo to compare a choice without adding a cancelling pair of presses.
- Why does New Puzzle show the same opening?
- This version resets the same fixed 5×5 puzzle rather than generating a random board or unlocking a new level. Replay it to test a different set of presses and compare your move count.
