Because the PSP remains a beloved device for homebrew, several developers have attempted to recreate or port Undertale for it.
As of late 2025, various fan communities continue to work on improving engine performance and adding dialogue, but a "complete" and bug-free version remains elusive. Undertale Psp Iso Download REPACK
A project featured in game jams that aims to recreate the Undertale experience on the PSP. These are often remakes from the ground up rather than direct ports of the original code. Because the PSP remains a beloved device for