The PS Vita is the best portable option because Castle Crashers is available natively on the PlayStation Store for Vita (cross-buy with PS4/PS3). The Vita offers:
Note: This is not PSP—it’s a separate handheld. But many people searching for "PSP ISO" actually just want a Sony handheld experience. The Vita is the real answer. castle crashers psp iso
Searching for Castle Crashers PSP ISO is a minefield. Most sites offering the download are: The PS Vita is the best portable option
Pro tip: If a game was never commercially released on PSP, any ISO claiming to be it is illegitimate by definition. Note: This is not PSP—it’s a separate handheld
You have three legitimate paths to enjoy Castle Crashers on a handheld, though none involve a native PSP ISO.