Because Undertale was built using GameMaker Studio, it is too "modern" for original GBA hardware to run directly. However, talented developers have rebuilt parts of the game specifically for retro handhelds:
Today, the "GBA" search is a relic of the past. Modern fans use: Official Console Ports: undertale gba download android
Finding a way to play on a Game Boy Advance (GBA) emulator for Android is a popular quest for fans who love retro aesthetics. While there is no official GBA version of the game, the dedicated community has created several "demakes" and unofficial ports that make this nostalgic experience possible. Because Undertale was built using GameMaker Studio, it
Several developers have recreated Undertale for retro hardware. These "demakes" can be played on Android using a Game Boy Advance or Game Boy Color emulator. Undertale Gameboy Demake (The Chronomaniac) While there is no official GBA version of