Lord-M schrijft dat nVidia een gratis "total conversion" in elkaar heeft geknutseld voor Quake III Arena. Deze conversie, genaamd Sidrial, weegt 117MB en bestaat uit één single player level, en één multiplayer level. Het verhaal is als volgt:
In Sidrial, a bloodthirsty race bent on power and destruction have annihilated every inhabited planet in their wake. Sidrial is the last outpost between Earth and extinction. In the Total Conversion, the Sidrial story is the driving force behind the game where players find themselves in the middle of a seemingly hopeless war. A devastated planet forges new heroes and the ultimate fight is for survival. The two levels included in the release, one single player and one multiplayer level, reflects the basic storyline of a war torn planet.