0h n0

0h n0 is a daily logic puzzle where your mission is to place red blocking dots on a grid so that every blue numbered dot can see exactly the number of other dots it displays. It's inspired by the Japanese game Kuromasu.

Each puzzle gives you a grid scattered with blue dots, some already numbered, some blank. Red dots act as walls, blocking the line of sight for blue dots in the same row or column. Your job is to figure out which empty cells need red dots.

• Tap an empty cell to mark it red and block sight lines.
• Blue dots show how many other dots they can see in their row and column combined.
• Red dots stop blue dots from seeing past them.
• Every blue dot must see at least one other dot.
• Complete the grid so all the numbers add up correctly.
• Choose your grid size before each puzzle, from 4x4 up to 8x8.

Why we like it:

• ✅Clean, minimal design that gets out of the way of pure logic.
• ✅Harder than it looks, with satisfying cascades when placements click.
• ✅From the creators of 0h h1, so you know the quality is there.

Hint: Start with the highest numbers. A blue 4 or 5 severely limits where red dots can go nearby. Lock those in first, and the rest of the grid often falls into place.