The goal of the game

Fill every blank cell with either 0 or 1. A finished grid is correct only when every row and every column follows all three rules.

You never need arithmetic. The challenge is noticing which value is forced by the surrounding pattern.

The three Binary Puzzle rules

Each rule is simple on its own. The interesting deductions appear when two or three rules constrain the same cell.

Keep it balanced: every row and column contains the same number of 0s and 1s.
Stop runs of three: 000 and 111 are never allowed horizontally or vertically.
Keep lines unique: no two completed rows match, and no two completed columns match.

Make your first move

Start with two matching values that touch, or two matching values with one space between them. The nearby open cell must use the opposite value.

No-three example
0 0 _ 1 0 10 0 1 1 0 1

The third cell must be 1 because three consecutive 0s would break the rule.

Use the board controls

Tap a blank cell to select it, then choose 0 or 1. You can also tap the same cell to cycle its value. On a keyboard, use the arrow keys to move and press 0, 1, Backspace, or Delete.

Undo is useful when testing a chain of deductions. Hints explain a rule before they place a value, so you can learn without giving away the whole board.

Choose a good first board

Begin with 6x6 Easy. The board is large enough to demonstrate every rule but small enough to scan quickly. Move to 8x8 Medium when pairs and balance checks feel automatic.