This version of Mega Man X3, released only in Japan, has a glitch which allows you to access Dr. Doppler's fortress without actually beating any of his Robot Masters. This glitch permits Hetfield90 and nrg_zam to take a drastically different route from the SNES version, popping into Doppler 1 and Doppler 2 after only three Robot Master stages (and Vile's Factory) to get the Z-Saber far earlier than should be possible.

(Theoretically you can get the Z-Saber with only two defeated Robot Masters; from a speedrun perspective, however, once you finish Vile's Factory, it makes more sense to finish the stage you accessed it from than to game over and return to the map.)