If you are specifically looking for a hack-and-slash experience for your PSP, consider these official releases:
: A high-difficulty 2D action game with the quirky humor Castle Crashers fans enjoy. i castle crashers psp iso exclusive
The Behemoth originally released Castle Crashers on Xbox Live Arcade in 2008. While it eventually expanded to PlayStation 3 (2010) , Steam (2012) , and later PlayStation 4, the handheld PSP was skipped entirely. Why "PSP ISO" Searches Exist If you are specifically looking for a hack-and-slash