Also, some games may not open, don't know why, just happens that way.
Hello

yes there are apps that won't open up, and are ceashing at start, that's because people who posted them didn't chose the right firmware. For example, i downloaded the Vector game ipa and imported it in my iTools library, and in the right side of the app where you can see if the app is compatible with your device there was indicated that the app is compatible with iOS 4+. Maybe there was a earlier version that people know it worked but it's not that, maybe it was lost so they posted a more recent ipa thinking it's compatible(same story with Bumpy Roads

). And that's because not the developer itself is posting these apps, there are users from around the world who have the app cracked.
Anyways, nice source for those who want to find more iOS 3 apps