You will need:
9x Sets of Pieces
9x Boards
1x Lid
I made this physical sudoku board that connects together for a modular assembly.
The pieces are double sided so you can determine which are the starting numbers. I tried a couple ways of coloring them but I will leave that up to your own preference.
I also attached a doc with 6 templates for a few games to start with.
The author marked this model as their own original creation.