Lights Puzzle - Daily Challenge

Lights Puzzle (Ice Out) is a logic puzzle based on the classic Lights Out game. Pressing a cell toggles its state and the state of adjacent cells. The goal is to turn off all lights.

At SimFuns, we publish a brand new Lights Puzzle puzzle every day at UTC midnight. Players worldwide tackle the same puzzle and compete for the fewest moves on the leaderboard.

This game trains your pattern recognition and chain reaction planning. No sign-up required, just play.

How to Play Lights Puzzle

• Press a cell to toggle its state and the state of adjacent cells (up, down, left, right).
• Frozen cells cannot be pressed directly. You must affect them through chain reactions from neighboring cells.
• The goal is to turn off all lights on the board.
• Complete the puzzle in as few moves as possible. Fewer moves mean a better leaderboard ranking.

Solving Tips

• Solve row by row: start from the top row and use cells in the next row to fix the current row.
• Memorize patterns: certain click sequences produce predictable effects, which improves efficiency.
• If stuck, use undo to go back a few steps instead of restarting.
• Practice daily to build intuition for chain reactions.

Frequently Asked Questions