I need to design a cup for a reception for first-year college students and i'm searching for some challenging and entertaining math puzzle or game to use.
Previous years it has been used the "Three Utilities Problem", but i'm looking for something different or (at least) less known.

So far I have thought about:

* *Nine Dot puzzle*
* *Some Tessellation puzzle*

Do you know another Puzzle or game of this style ? (that can be printed on a cup)

Thanks in advance