Unreal Engine 2

In October 1998, IGN reported, based on an interview with affiliate Voodoo Extreme, that Tim Sweeney, founder of Epic Games, was doing research for his next-generation engine.

[6] UE2 could also support varied game genres and styles, with IGN contrasting its use in America's Army with Domestic, an artistic modification of Unreal Tournament 2003 that combined "poetry, cinema, and nostalgia into an interactive first person exploration".

[6] A specialized version of UE2 called UE2X was designed for Unreal Championship 2: The Liandri Conflict on the original Xbox platform, featuring optimizations specific to that console.

[7] In March 2011, Ubisoft Montreal revealed that UE2 was successfully running on the Nintendo 3DS via Tom Clancy's Splinter Cell 3D.

[8] "The 3DS is powerful, and we are able to run the Unreal Engine on this console, which is pretty impressive for a handheld machine, and the 3D doesn't affect the performance (thanks to my amazing programmers)," said Ubisoft.

Impressed by their efforts, Epic decided to include it in its successor as an official game mode under the name Onslaught by hiring Psyonix as a contractor.