: Copy the entire Undertale folder into the GAME directory.
: This is one of the more active projects. Development has recently focused on completing the intro with full sound and rebuilding the world engine in C++ for better performance. You can find technical updates and test builds on the PortableTale GitHub SnooLentils704 Port undertale psp iso download top
: Disconnect, go to Game > Memory Stick on your PSP, and select Undertale. ⚠️ Important Considerations Performance : Expect occasional lag in bullet-hell segments. : Copy the entire Undertale folder into the GAME directory
Most stable versions include the full main story, including the Neutral, True Pacifist, and Genocide routes. Adapted Controls: You can find technical updates and test builds
While the game is available on PlayStation 4 and PlayStation Vita, the PSP was already reaching the end of its lifecycle when Undertale blew up in 2015. Because the PSP lacks the native hardware architecture to run the GameMaker Studio engine used for Undertale, an official "ISO" file doesn't exist in the traditional sense. Undertale PSP Homebrew: The "Fan Port"
If you find the PSP homebrew version too limited, there are better ways to get your Undertale fix on a handheld:
A massive repository for preserved homebrew software where fan ports are occasionally uploaded. PSP Homebrew Discord Servers