Link cable
The Link Cable
The Game Boy Advance has a serial port on its side for connecting to other consoles. With a link cable, two or more GBAs can trade data for multiplayer matches, trading between game saves, and special features that wake up only when a second system is present.
Things it enables
- Multiplayer. Racing, fighting, and party games support several linked players, sometimes from a single cartridge.
- Trading. Creature-collecting and RPG titles let players swap items or characters between saves.
- Cross-game unlocks. Some games reveal bonus content when linked to a companion title.
The GBA link connector is not the same as the older Game Boy connector, so a classic link cable will not fit a GBA without an adapter. The GBA SP uses a different port shape again and needs its own cable or an adapter to join standard GBA units.
Single-cartridge play
Many GBA games support multiplayer where only one player owns the cartridge. The host shares a small program over the cable so others can join with an empty slot. Modes and player counts vary per game.
For homebrew, the link port is also a hobbyist data channel: developers have used it for two-player demos and even for transferring files between a GBA and a computer with the right hardware. If a link session refuses to start, check that both cables are fully seated and that every console runs a compatible game version.