dork.fyi

How to Play

1. Fill only the blank cells. Given cells are fixed.
2. Each row, column, and 2x2 box must contain 1-4 exactly once.
3. Tap a blank cell to cycle values from 1 to 4.
4. Right-click a blank cell to clear it, or use Clear Blanks.
5. Press Check Grid to score and highlight incorrect blanks.