Pattern trainer for two-symbol grid puzzles
Learn the 36 row patterns, then solve fresh 6×6 boards with hints that show their reasoning.
Technique
Fill every cell you can be sure of
Click a cell to cycle ● → ○ → empty. Leave a cell empty if this row alone doesn’t decide it.
Each row and column gets three ● and three ○. No three of a kind touch in a line. = joins matching cells, × joins opposite ones.
How to read a line
- Every row and column holds exactly three ● and three ○.
- No three of the same symbol touch in a row or column.
- = between cells means they match; × means they’re opposite.
the clue that matters
what it forces