0hh1 – Binary Logic Puzzle
## About 0hh1
0hh1 (pronounced oh-one) is an elegant logic puzzle game created by Martin Kool. It is a beautifully designed binary puzzle that challenges your deductive reasoning. The rules are simple enough to learn in seconds, but the puzzles range from easy to mind-bendingly difficult. Open-source under MIT license, 0hh1 is a perfect game for anyone who enjoys Sudoku, Nonograms, or other logic-based puzzles.
## How to Play
The puzzle is played on a square grid. Tap or click a tile to cycle through three states:
1. **Red** (filled)
2. **Blue** (empty)
3. **Blank** (undecided)
**The goal:** Fill the entire grid following the three rules below.
## The Three Rules
1. **No three in a row.** You cannot have three consecutive tiles of the same color in any row or column.
2. **Equal counts.** Each row and column must contain an equal number of red and blue tiles. On a 4×4 grid, that means 2 red and 2 blue per row and column.
3. **No duplicates.** No two rows can be identical, and no two columns can be identical.
## Tips and Strategy
1. **Start with forced moves.** If you see two tiles of the same color in a row, the tiles on either end must be the opposite color. This is the most common deduction in the game.
2. **Count colors.** If a row already has the maximum number of one color, all remaining blank tiles must be the other color.
3. **Check for duplicates.** If a row is almost complete and matches another row except for one tile, that last tile must be different.
4. **Work incrementally.** Fill in what you can deduce, then re-examine the grid. Each new tile you place may create new deductions.
## Game Features
– Multiple grid sizes (4×4, 6×6, 8×8, 10×10, 12×12, 14×14)
– Three difficulty levels per size
– Elegant, minimalist design
– Touch and mouse support
– Hint system for when you get stuck
– Open-source under MIT license
If you love logic puzzles, 0hh1 will keep your brain engaged for hours. Start solving now!