0h n0

0h n0 is a minimalist logic puzzle where you fill a grid with blue and red dots. Each blue number tells you how many blue dots it can see in its row and column, and red dots block the view. Use careful deduction to complete every board correctly, starting with small grids and moving on to larger, trickier ones.

Click or tap an empty cell to cycle between blue and red. Make every number see exactly as many blue dots as it shows.