ID followed up the gaming smash that was 'Doom' with numerous sequels and add-ons. Then in 1996, they released 'Quake'.

With 'Quake' the envelope was pushed further than ever before. Character sprites were replaced with a 3D polygonal graphics engine and support for hardware-accelerated 3D graphics was added. That and 'Quake' invented 'capture the flag' in gaming.