A logic puzzle played on a square grid that must be filled entirely with zeros and ones under strict rules. Three matching digits cannot sit next to each other in a row or column. Every row and every column must contain an equal count of zeros and ones. No two rows and no two columns are allowed to be identical. Tap an empty cell to place a zero, tap again to place a one, and tap once more to clear it. Mistakes are highlighted automatically and a fully solved grid is celebrated with an animation.