VGC writes, "Doom. What more can be said, really? Id Software unleashed this milestone first-person shooter on us in 1993, and people are still obsessed with it nearly two decades later. Responsible for tens of millions of hours’ worth of lost productivity, Doom got ported to every system known to man after its release. Everybody has played the PC version to death, but some of the console variants remain obscure to this day. That’s why Video Game Cowboys has spared no expense to track as many of them down as possible and report what is worth your time and effort to acquire, and what should be left to rot in a zombie-ridden hellhole on Mars."