You don't need to invent puzzles from scratch. You can adapt existing Sudoku resources for your ColorKu board: Colorku Puzzle Card Expansion Packs
: Each color must appear exactly once in every vertical column. colorku puzzle cards pdf
ColorKu Puzzle Cards – Fun & Screen-Free Sudoku for All Ages You don't need to invent puzzles from scratch
– Extremely sparse starting layouts. These puzzles challenge even seasoned logic pros. How to Find and Use Colorku PDF Cards colorku puzzle cards pdf