THE GAME, AT A GLANCE
About 0h n0
0h n0 is a line-of-sight logic game by Q42 and Martin Kool. Blue dots can see along their rows and columns until a red tile blocks the view. The numbers tell you how many other blue tiles must be visible. This archived open-source edition is hosted locally without ads.
Your goal: Color the grid so each numbered blue tile sees exactly the indicated number of other blue tiles.
How to play 0h n0
- Start with the tutorial or select a board size.
- Click or tap a tile to cycle between blue, red and empty. Count visible blue tiles in the four straight directions; do not count the numbered tile itself.
- Use red tiles to block a line of sight. Every blue tile must see at least one other blue tile; hints can help explain a deduction.
Publisher controls: Click or tap to cycle a tile between blue, red and empty. A numbered blue tile counts other blue tiles it sees horizontally and vertically; red tiles block the view. Use the tutorial to learn the rules.
Tips for 0h n0
- When a number already sees enough blue tiles, look for places where red must stop its view.
- Count all four directions before deciding that a number is satisfied.
- Use the small boards to learn the visibility rules before trying a larger grid.
