According to ESRB, this game contains: Comic Mischief
If you played PaRappa, then you know what you're getting into. It's not for the Quake-heads or for EverQuest fans, but it's such a departure from the norm that I have to recommend that all players give it a try. Um Jammer Lammy is not nearly as polished and endearing as PaRappa's, but Lammy's quest is certainly silly and innocent enough to be a refreshing break from the norm. It is important to note however that Lammy may be a harder game than PaRappa, but it is still quite short (making it a perfect rental), so be warned.