FREE: Rise of the Triad: Dark War [Steam Key]

The listing, Rise of the Triad: Dark War [Steam Key] has ended.

Tackle incredible game hazards, such as spinblades, gun bunkers, huge boulders, Firejets, pits, Firechutes, Lavawalls, gas grates, and more.

"Like DOOM, Rise of the Triad is a high quality, fast scrolling first-person perspective 3D action game. Graphics are on par with DOOM. It has destructive enemies and lots of them, an arsenal of weapons from simple pistols to missile launchers, life-preserving armor, traps and ambushes galore, and the ability to play by modem or network. In all, there's a great degree of similarity between the two games. In addition, Rise of the Triad puts most of the other DOOM wannabes to shame - it's that good!" - Chuck Miller, Editor of interactive Entertainment

More info: http://store.steampowered.com/app/358410/
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This game works on mac too!

Good Luck!