Black & White Grid
Balance black and white tiles. No triples, no identical rows or columns.
Controls and saving
Tap a cell to cycle through empty, black and white. Tiles marked ◆ are fixed. Use arrow keys to move, Space or Enter to cycle, and Delete to erase.
Progress is saved on this device when storage is available.
How to play
Tap an empty cell for black, again for white, and again to clear it. Never put three tiles of the same colour consecutively in a row or column. Each row and column must contain equal numbers of black and white tiles. Every completed row must differ from every other row; the same applies to columns. Tiles marked ◆ are fixed. Hints reveal a strategy, a cell, then the answer.
Learn more
These puzzles are generated for this site. Tests verify a unique solution and logical completion using the triple, balance and distinct-lines rules. Black is a filled circle and white is an outlined circle.