The request for an "ISO link" touches upon the complex issue of piracy. In the retro gaming community, downloading an ISO of a game one does not own is a violation of copyright law. While the ethics of "abandonware" (software no longer sold or supported) are debated, Castle Crashers is actively supported by The Behemoth. It is currently available for purchase on Steam, the PlayStation Store, the Nintendo eShop, and the Microsoft Store.
Castle Crashers on PSP is a legendary "what if" in the gaming community. While the game defines the beat-em-up genre on consoles, its history with Sony’s handheld is a mix of homebrew dreams and technical workarounds. castle crashers psp iso link