0h n0

0h n0 uses red and blue dots to make a line-of-sight logic puzzle. A numbered blue dot tells you how many other blue dots it can see along its row and column; red dots interrupt that view. You must decide which color belongs in each unknown position so the clues agree. The fun comes from finding a placement that explains several clues at once, making this a thoughtful alternative to a conventional number grid.

Sightline clues
Color deduction
Compact brain teasers

YOUR FIRST ROUND

How to play 0h n0

Color the dots so each numbered blue dot sees exactly the stated number of other blue dots.

Count the visible blue dots around a numbered clue.
Use red dots to stop a sightline where needed.
Recheck intersecting rows and columns until all clues are satisfied.

Controls

Click or tap a dot: Choose its color.

Tips for a better run

Remember that a red dot blocks everything beyond it in that direction.
Compare a clue with the maximum space available in its sightlines.

GAME DETAILS

Source: Famobi / HTML5Games
Format: HTML5
Platforms: Browser
Orientation: Responsive
Play location: Here on Gamezesty

View source page ↗

BEFORE YOUR NEXT ROUND

0h n0: useful things to know

Pick 0h n0 for line-of-sight deduction, where a single blocking dot can explain several number clues.

Do diagonally placed blue dots contribute to a numbered clue?

No. A blue dot sees other blue dots along its own row and column. Count along those horizontal and vertical sightlines rather than including diagonal neighbors as you might in a different grid puzzle.

Does a red dot count toward the number or just interrupt the view?

Red dots block the view. They are not blue dots to count, and blue dots beyond a red blocker are hidden from that clue in that direction. Recount only the blue dots visible before the blocker.

Publisher / creator research reviewed 2026-09-08. These notes describe the game; they are not a claim of testing every level or device. Our editorial approach.

Sources for these notes

html5games.com — source 1 (opens in a new tab)

0h n0

How to play 0h n0

Controls

Tips for a better run

0h n0: useful things to know

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