About 0hh1

Solve the 0hh1 puzzle in this addictive logic game.

How to play

In 0hh1 you fill every row and column of the grid with two symbols while following a few simple rules. You can never have more than two of the same symbol touching in a line, each row and column must contain the same number of each symbol, and no two rows or columns may be identical. Click or tap a tile to cycle it between blank and the two colors until all the rules are satisfied.

Tips and tricks

Start by looking for obvious patterns such as two identical symbols next to a blank, like 00_ or 11_, which force the third tile to be the opposite. Keep an eye on how many of each symbol are allowed in a row or column; once you reach that limit, the remaining spaces have to be the other color. If you get stuck, undo a few recent guesses rather than clearing the whole board so you can keep the logic chain intact.

Why this game works well at school or work

0hh1 puzzles are small and easy to pause, so you can solve a few lines during a short break and return later without losing track. The game quietly trains logic, deduction and pattern recognition without timers, sound effects or flashing graphics. Because it runs in the browser with very simple controls, it fits nicely on shared school or office computers.