PC, Mac, PlayStation 4, PlayStation Vita, Nintendo Switch, and Xbox Homebrew Projects

I moved the ISO to my memory stick, unhooked the USB, and hovered over the game icon in the XMB menu. The background music was quiet—just a low-bitrate, distorted loop of Long Elevator . The icon was a pixelated Frisk, but their eyes looked... off. Tired. I pressed X.

The PSP’s homebrew community was massive. After Sony stopped supporting the console, developers began porting PC games to the system via custom firmware. While Undertale (originally released in 2015 for PC, then later for PS4, PS Vita, and Switch) never got an official PSP port, clever modders have attempted to create unofficial versions.

If you’re looking to play Undertale on a portable device, here are legitimate alternatives:

: The port mirrors the original mechanics, including the bullet-hell soul dodging and "ACT" menus. Controller Optimization

: A beta phase project using Game Maker and the Choby GM compiler, showing the tutorial area with functional menus and saving. Why a Full ISO is Highly Unlikely