There is a thriving homebrew community for the PSP. It is possible a fan-made project attempted to recreate Castle Crashers using the PSP's limited engine.
If you find a link for a "Castle Crashers PSP ISO," you are likely looking at one of the following: castle crashers psp iso 171
: Some users "played" it on PSP by using Remote Play with a hacked PlayStation 3, leading to confusing screenshots online that made it look like a native port. The Real Story of the Game Castle Crashers on PSP: The Truth Behind the
: Due to the PSP's hardware limits, these versions often have reduced resolution, lower frame rates, and simplified animations compared to the official PS3 version. Safe Ways to Play Castle Crashers If you find a link for a "Castle
The number “171” likely refers to a specific cracked build or a fake version number. Community forums from 2010–2015 often hosted such files, but they are outdated, unsupported, and often lead to: