0h h1 Two-Color Logic
Fill the board with red and blue. With no timer, follow three rules and find the answer at your own pace.
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How to play
Fill the board with red and blue: no three tiles of the same color may appear in a row horizontally or vertically; each row and column must contain equal numbers of both colors; and no two rows or columns may be identical. There is no time limit, and hints and undo are available.
Controls
Click or tap a tile to cycle through empty → red → blue → empty. Tiles given in the puzzle cannot be changed. Click the eye icon for a hint, press Ctrl / Command + Z to undo, and Esc to go back. With a keyboard, use Tab to focus a tile, the arrow keys to move, and Enter or Space to change its color. Choose a 4×4, 6×6, 8×8 or 10×10 board in the game.
A little tip
Start with two adjacent tiles of the same color: the tiles on either side must be the other color. Then look for matching colors separated by one tile, and rows or columns where one color already fills half the tiles.