F-Zero AX was the arcade equivalent of F-Zero GX, released by Nintendo and Sega for the not-widely-used Triforce arcade system, which was based on GameCube hardware. Players of F-Zero GX could take their GameCube memory cards to an arcade with an F-Zero AX arcade machine and download a save file that would unlock the AX Cup, letting them race on the F-Zero AX tracks on the home version of the game. Those not fortunate enough to have access to an AX arcade machine had to beat story mode on hard to unlock the AX Cup, which is a legendary feat few can accomplish.
It turns out that the entirety of F-Zero AX was actually sitting unaccessible on the F-Zero GX disc. Some industruous hackers armed with copies of the GameCube Action Replay have dug into the depths of the disc and found the arcade game nestled within.
If you have an Action Replay or Gameshark, you can find the code necessary to make GX boot into AX here.
