&gt; Recall that Doom is a multi-level first person shooter that ships with an advanced 3D rendering engine and multiple levels, each comprised of maps, sprites and sound effects.<p>Doom isn&#x27;t in true 3D, its an advanced raycasting engine. The levels are all 2D, there are no polygons, you can&#x27;t look up and down.  Doom has been ported to a TI Calculator. Lets maintain some perspective here.