Hello World game for many game systems
Zendo is an Icehouse game which can be ported to different game systems; none of the fundamental rules refer to any sort of specific pieces, you just need pieces that can be combined together into structures such that there can be some rule that distinguishes two classes of structures built out of the pieces; or if you're familiar with Zendo terminology, you need to be able to build koans out of the pieces, and come up with a rule that distinguishes which koans have the Buddha nature. 

I've played Zendo with playing cards before (rules can be things like "a koan has the buddha nature if the red cards add up to 10"), and it could just as well be played with Piecepack ("a koan has the buddha nature if it has at least one sun square and one moon coin"), or likely could be adapted to most any game system. 

The nice thing about porting Zendo to other game systems is that the rules you make up will adapt to the attributes of the game system in question; the mechanics don't rely on things you could do with any pieces whatsoever, like count them or put them in piles.

For some other game systems than Icehouse, it might help to have more than one copy, as you need to be able to use identical pieces in different koans to test out theories. An Icehouse set is almost ideally suited, as you have 5 copies of every piece, with just enough attributes different between the pieces (4 colors, 3 sizes, a few different orientations you can place them in, a few ways to stack them) that rules are relatively easy to judge and not too hard to guess; but you can use pretty much any game system you want.