The iPhone is jailbroken with redsn0w, and is currently running 3.1.3 OS.
I have downloaded a lot of games. Some work properly without any problems, but others crash the moment i start them. games such as Hero of sparta and Tesla wars. On the other hand the game Hero of sparta 2 works fine.
I synched all these games to my friend's ipod touch 3g and they worked propely.
can this be fixed?
thanks

This pretty much only happens when you're trying to pirate software. If you're not, and I'm off-base - sorry - but this is extremely common when people install less than reputable software to allow cracked games on their devices.

If I'm wrong, then you can solve this by ensuring all apps are downloaded to iTunes, then plug the phone in, tell it to NOT sync apps (which will remove all the apps on the phone), then tell it to sync apps (which will re-add all the apps on the phone), and that will likely resolve the issue.

If I'm not wrong, the only way to fix this is to uninstall the offending package (you'd know which one it is, I'm not mentioning it by name.), re-sync your device, and re-download your legitimately purchased apps.