Connect your PSP to your PC and place the game folder into /PSP/GAME/ .
Look for the "Castle Crashers PSP" project on community hubs like Wololo, Brewology, or the Internet Archive. castle crashers psp iso link
Disconnect and find the game under the "Game" menu on your XMB. Modern Alternatives: Playing on the Go Connect your PSP to your PC and place
Includes the four main knights (Green, Red, Blue, and Orange). How to Play Castle Crashers on PSP castle crashers psp iso link