Puzzle size :
4x4
|
5x5
|
6x6
|
7x7
|
8x8
Boards :
1-20
|
21-40
|
41-60
|
61-80
|
81-100
For instructions, see
https://www.dr-mikes-math-games-for-kids.com/printable-color-switcher.html
.