| | Verdict | | :--- | :--- | | Does the file exist? | No official or stable fan version exists. | | Is it safe to download? | Extremely dangerous (malware, scams). | | Is it legal? | Piracy, since the game is copyrighted and not abandonware. | | Will it ever exist? | Unlikely due to GameMaker engine constraints. |

Recent updates and demos have surfaced in the homebrew scene, including entries in the PSP Monthly Game Jam Download & Installation

While Undertale has been released on various platforms, including PC, Mac, Linux, PlayStation 4, Nintendo Switch, and Xbox One, there is no official PSP version. However, fans of the game have been searching for an Undertale PSP ISO download exclusive, hoping to play the game on their PSP consoles. In response to this demand, some enthusiasts have created PSP-compatible versions of the game, which can be downloaded and played on the PSP using custom firmware or emulators.

If you're interested in playing Undertale, I recommend checking out official channels, such as: