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In page Rise of the Triad:
"The engine is an enhanced variant of the Wolfenstein 3D engine. The level design uses 90-degree walls and unvarying floor and ceiling heights in individual maps, limitations that are vestiges of the Wolfenstein 3D engine. However, the Rise of the Triad engine also includes features not possible with the original Wolfenstein 3D engine, such as elevation, panoramic skies, simulated dynamic lighting, fog, bullet holes, breakable glass walls, and level-over-level environments (made possible by "gravitational anomaly disks", suspended objects that collectively form stairs, floors, etc.).[citation needed] The level layouts were created with Tile Editor version 5 (TED5), which was also released with Extreme Rise of the Triad for users to customize their own maps.[1]