Lights Out

Tap a lamp to flip it and the four lamps next to it. Switch every lamp off in as few moves as you can.

Difficulty
High score
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Pressing a lamp toggles it and its neighbours above, below, left and right. Turn all lamps off to win. Every puzzle can be solved, and fewer moves earn a higher score. Easy is 4×4, Standard 5×5 and Hard 6×6.

How to play
  1. Tap a lamp. It and its four neighbours switch.
  2. Plan your presses: pressing the same lamp twice cancels out.
  3. Turn every lamp off to solve the puzzle.
Tips and tricks

A few ideas that make Lights Out easier and more fun:

  • Work from the top row down: use the row below to switch off each lamp that is still on.
  • Pressing a lamp twice does nothing, so never repeat one.
  • Only the set of lamps you press matters, not their order.
About Lights Out

Play Lights Out online

Lights Out is a classic switch puzzle that began as an electronic handheld game. Every press changes a small cross of lamps, which makes cause and effect delightfully tangled.

Why it works

Each press has side effects, so you plan ahead and keep track of what you have already changed. The task uses logical reasoning and working memory.

These are the skills used during play; improvement outside the game is not established.