: You can choose to "ACT" and spare every enemy rather than fighting, leading to entirely different story paths.
Because Undertale was built in GameMaker: Studio—an engine that does not natively support PSP—developers have to rebuild the game from scratch using PSP-friendly languages like Lua or C++. undertale psp iso download exclusive
Undertale on PSP: Is There an Official ISO & What Are Your Real Options? : You can choose to "ACT" and spare
show that the intro and basic world engine are being refined, though it is not yet a complete version of the full game. PSP Monthly Game Jam Demos undertale psp iso download exclusive