I like the idea of simple games that give players a lot of flexibility in strategy, like Prisoner's Dilemma, but something people would actually play for fun. So far, I've managed to find Pass the Pigs, a dice game, and Dominion, a card game. What other games have endless strategies to try out, yet involve really simple rulesets?
Sorry if this is off-topic. I didn't know where else to post this.
Some combinatorial games:
Combinatorial Games I: the world of piles of stones
Combinatorial Games II: different moves for left and right
Towards a theory for combinatorial games