Click cells to flip numbers and their neighbors. Make the whole grid uniform in as few moves as possible.
Mode: 3x3 Easy
Puzzle: #001
Time: 0:00
Moves: 0
Target: ? moves
Click any cell to flip it and its adjacent neighbors.
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Game Introduction
overview
Number Flip is a logic puzzle inspired by the classic "Lights Out" concept. You are given a grid of cells,
each showing either 0 or 1. Clicking any cell toggles its value and the values of all directly adjacent cells
(up, down, left, right). Your goal is to make every cell on the grid display the same number.
It sounds simple, but requires careful strategic thinking to solve efficiently.
rules
Each cell shows either 0 or 1.
Clicking a cell flips its value (0 becomes 1, 1 becomes 0).
All orthogonally adjacent cells (up, down, left, right) also flip.
The puzzle is solved when all cells show the same number (all 0 or all 1).
Every puzzle is guaranteed to have a solution.
Try to solve it in the fewest moves possible — the target moves count is shown below the grid.
controls
Click or tap any cell to flip it and its neighbors.
Use Check to see if the puzzle is solved.
Use Hint to highlight the next optimal cell to click.
Use Undo to reverse your last move.
Use New Game to generate a fresh puzzle.
Toggle sound with the speaker button.
scoring
Your score is based on the number of moves used to solve the puzzle compared to the target (optimal) number of moves.
Solving in exactly the target number earns a perfect score. Using fewer hints and less time also improves your rating.
Larger grids and harder difficulty levels give bonus points.
tips
Clicking the same cell twice undoes its effect — avoid unnecessary double-clicks.
Corner cells affect fewer neighbors, so they can be easier to reason about.
Work from one edge to the other systematically rather than clicking randomly.
The order of clicks does not matter — only which cells you click (and how many times) affects the outcome.
If stuck, use Hint to see the next optimal move, then try to understand why.
faq
Is every puzzle solvable?
Yes. Each puzzle is generated by scrambling a solved grid with a known sequence of moves, guaranteeing a solution always exists.
Does the order of clicks matter?
No. In Number Flip, the final result depends only on which cells you click an odd number of times, not the order. This is a key insight for solving efficiently.
What does the target moves number mean?
It shows the minimum number of distinct cell clicks needed to solve the puzzle. Your goal is to match or come close to this number.
