Play 0h h1 Online
Fill the grid with red and blue using three simple rules. A beautiful little logic game. Free, instant, no downloads.
What Is 0h h1?
0h h1 is a lovely logic puzzle built on three simple rules: no three tiles of the same color in a row, every row and column has an equal number of red and blue tiles, and no two rows or columns are identical. From those rules, every puzzle has exactly one solution you can reach by pure deduction.
Made by Dutch studio Q42, 0h h1 scales from relaxing 4×4 grids to brain-bending 12×12 boards. It's the perfect coffee-break puzzle: clean design, no timer pressure, and that satisfying click when the logic falls into place.
Controls
| Key | Action |
|---|---|
| Click / Tap | Cycle a tile: empty → red → blue |
| Hint button | Get a nudge when stuck |
Tips & Strategy
- Two same-colored tiles together? The tiles on both ends must be the opposite color.
- Count colors: once a row has its quota of red, the rest is blue.
- Compare nearly-finished rows — duplicates are forbidden.
- Never guess. Every tile is deducible; guessing creates contradictions later.
Frequently Asked Questions
Is 0h h1 free to play?
Yes. 0h h1 is completely free to play in your browser with no downloads or signups required.
Can I play 0h h1 on my phone?
Yes. 0h h1 was designed mobile-first and plays perfectly with touch.
Do I ever have to guess?
No. Every puzzle has exactly one solution reachable by logic alone.