, which does not natively support the PSP, these projects often require complete rewrites of the game's engine. Fan-Made Ports
Be extremely cautious of websites offering "exclusive" or "full version" downloads. Since no official ISO exists, these files are often: Fake : Containing unrelated data or malware. undertale psp iso download exclusive
Undertale on PSP: Is There an Official ISO & What Are Your Real Options? , which does not natively support the PSP,