The game was built using Unreal Engine 4 and initially faced technical hurdles, including sub-30fps performance and micro-stutters on original hardware.

The ROM (Read-Only Memory) of Mario and Luigi: Brothership is a digital copy of the game's data, which can be played on a GBA emulator or on a physical GBA console using a flash cartridge.

From a legal standpoint, downloading a Mario & Luigi: Brothership ROM without owning the original game constitutes copyright infringement. While preservationists argue for the necessity of ROMs for gaming history, Nintendo maintains a strict policy against unauthorized distribution of their intellectual property. Consequently, links to these files are frequently removed from public forums, and users risk exposure to malware when attempting to download from unverified sources. For the best experience and to support the developers who revived the beloved series, purchasing the official cartridge or digital copy remains the definitive method to play.