0h h1 is an addicting game for young and old. It is a little logic game where you have to fill the grid with either red or blue tiles. 0h h1 follows three simple rules: 1. Three red tiles or three blue tiles next to each other in a row or column isn't allowed. 2. A full row or column must have as many blue tiles as it has red ones. 3. No two rows are the same. No two columns either.Easy to learn, hard to master.