This version famously came in a steel book and included full ports of Ultimate Doom and Doom II , making it the ultimate "Doom box" for the time. Legacy and Impact
Character models and environments were simplified, but high-resolution normal maps were used to keep the "bumpy," detailed look of the PC version.
It remains one of the most iconic "big" games for the console, pushing the hardware to its absolute limit.
To fit the massive PC game onto the Xbox's 64MB of RAM, the developers had to get creative.