You're probably familiar with the 2-4-6 test. Well, I made an automated version of the verbal version of the Buddhist version of that. In essence: there's a rule that declares some phrases "have the buddha-nature" while others don't, and you get to keep testing ideas against it until you're pretty sure you've figured out the rule; then, you can check to see if you were right. If that sounds interesting to you, it can be played in-browser here.
Warning: Don't let yourself get nerd-sniped. My puzzles are not optimised for fun or meaning; if you find yourself spending more than an hour or so on this weird toy of mine, just look at the answers and move on.