Fictionary: one of the funniest, most educational thinking games, bringing out the etymologist in us all.
Number Boggle: open-ended, creative play with numbers.
Questions: a contest of verbal agility and often philosophical reasoning.
Three Penny: most of the thinking here is geometric.
Systems: a funny, clever, creative game that's perfect for small or large groups to become quick friends.
Water Quiz: a thinking game where ignorance is refreshing.