The confusion is understandable. Castle Crashers feels like a perfect fit for the PSP. The game features:

If you are looking for this specific file, proceed with extreme caution: Verify Sources: Always check Reddit’s PSP Homebrew community for safe, verified fan projects. Avoid ISO "Top" Lists:

, try official games like:

There is no official PS Vita version either, but there is active community interest in potential homebrew ports. As of now, no complete, playable port has been released for the Vita. 4. Retro Handheld Alternative

Castle Crashers was never officially released for the PlayStation Portable (PSP). It was originally developed by The Behemoth for the Xbox 360 and later ported to platforms including the PlayStation 3, PC, PlayStation 4, Nintendo Switch, and Xbox One.

The most bizarre part of the keyword is This does not correspond to any official version of Castle Crashers . The official game’s last major update was version 2.0 or 2.5 (on PC/Steam). So what is 171?