TPM, or The Philosophers' Magazine has an interesting page of interactive philosophical games.
[This is a picture of Rudy Jr. beating me at Go. He's been able to beat me at every known board game since he was five or six. Up till then he was a good chess partner for me!]
The idea is that you answer a series of questions, and the game chides you if your answers aren't consistent with each other, and praises you if they are. I tried “Staying Alive” and “Battleground God.”
I've started looking at protozoa in my microscope again. There's a nice pond of them at the top of this hill.