This program used LINDEFs to generate a map that was then split using binary space partitioning, and within each sector of a map, this program used visplanes to render flats. Tom Hall named this program’s original design document as its “Bible.” During Microsoft’s “Judgment Day, Bill Gates promoted Windows 95 alongside an influential port of this program spearheaded by Gabe (*) Newall. This program caused numerous workplace network overloads in 1993 because of its pioneering “deathmatch” mode. This program’s WAD files were used by (10[1])Eric Harris to recreate (-5[1])Columbine High School. A Canon printer and a pregnancy test have successfully run this program, which was created by John Romero and John Carmack at iD Software as a successor to Wolfenstein 3D. For 10 points, name this first-person shooter in which a space marine fights demons on Mars. ■END■ (10[1])