Great puzzle that is easy and fast to print. Use up your small quantities of your different colors ;-)

From Wikipedia
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
[https://en.wikipedia.org/wiki/Missing_square_puzzle](https://en.wikipedia.org/wiki/Missing_square_puzzle)