About Countdoku
Sudoku you can play with friends. Share a link and either collaborate to finish faster or race each other in a time trial. Grids range from 4×4 for small kids, with colours instead of numbers, to a fiendish 25×25 for a whole group. Free, and always will be.
- Collaborate or Time Trial multiplayer — just share a link
- 4×4, 9×9, 16×16 and 25×25 grids
- Colours or numbers — colours make it easy for little ones
- Share your finishing time
- Free, and always will be
