If you meant a different game or need help finding legal PSP games similar to Undertale (e.g., indie RPGs with unique mechanics), let me know and I’m happy to suggest alternatives.
engine (GameMaker Studio) did not natively support PSP exports, the community utilized two primary methods to bring the game to the handheld: The GameMaker-to-PSP Wrapper: Undertale Psp Iso Download REPACK
The game didn't start with the usual intro. No story of humans and monsters. Just a black screen and a single line of text in the center: If you meant a different game or need
Since Undertale was built in GameMaker—an engine not natively supported by PSP—developers must rebuild the game from scratch. This often results in heavy slowdowns during complex bullet-hell sections and janky collision detection. Just a black screen and a single line
When you see , the term "REPACK" is usually used by piracy groups to indicate a file that has been compressed, modified, or patched to work on specific hardware. In this case, a REPACK might include:
I found the link on a forum thread from 2016 that had been "archived" but never deleted. The title was plain: Undertale_PSP_Port_v1.0_ISO_REPACK_Full.rar .
While there isn't an official release of Undertale for the PSP, some enthusiasts have managed to create a working ISO file that can be played on the PSP using custom firmware. This ISO file is not an official release, but rather a fan-made creation that allows PSP owners to experience the game on their device.