I was just looking up on this and hardly any of the games are made for Palm Zire 31. Does anyone know why?

At least one beta tester was running Village Sim on a Zire 31.

Because of the low res screen, and slower CPU.

I run Village on a Zire 31 and it seems okay to me. I have also purchased Power Run which lets me store the app (and play the game) from an SD. Try it! The little people are quite small and there isn't much definition BUT you can see well enough to play and you can select a villager and go to detail to see how they are doing. Don't knock the Zire 31, give it a try.