no official version available for the PlayStation Portable (PSP) . While the game was officially released for PlayStation Vita PlayStation 4
When searching for "Undertale PSP ISO" downloads, exercise extreme caution: Reddit·PSP Mavhttps://www.reddit.com New Undertale PSP port : r/PSP undertale psp iso download exclusive
The "Undertale PSP ISO exclusive" is a myth. No amount of searching on Reddit, Archive.org, or emulation forums will produce an official ISO because it was never manufactured. no official version available for the PlayStation Portable
Instead of chasing a ghost ISO, buy Undertale on Nintendo Switch, PS Vita, PS4, Xbox One, PC, or mobile (via unofficial port). All of these run better than any hypothetical PSP version ever could. buy Undertale on Nintendo Switch