Inventing new games isn't a bad idea, but there are already a bunch that would be worth promoting.
Eleusis), Zendo), Penultima, and Mao are all games of inductive reasoning. And a list of games with concealed rules, some of them suitable for this project, and some of them just silly.
Mao might be the best bet for getting started with a lot of kids-- it's already a popular game.
For that matter, Twenty Questions might be a good place to start.
There are some interesting claims of increased IQ at the WWF n Proof site-- I don't know how well founded they are, but the game implies the possibility of a similar game based on Bayesian logic.
Thanks for that list of games.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.