Gaming Great Oddball PSP games

[Osaka]

So, everyone knows about the really popular good PSP games, but I was wondering if anyone knows of any great PSP games that others may not know about? like Yuusha no Kuse ni Namaikida or anything else.

I imagine there are a lot of fun Japanese PSP games that don't need any Japanese skills to play. Some people might not have ever come across them (like my above example). Mention any games, English, Japanese, any language.