Quake II

Whatever else may be said about Quake II, one thing is certain: It is the only first-person shooter to render the original Quake entirely obsolete.

Kerbal Space Program

Dead Space

System Shock 2

System Shock 2 both retains the best attributes of its predecessor and provides a fresh experience in its own right.

S.T.A.L.K.E.R.: Shadow of Chernobyl

This sci-fi team-based action game is built on GSC's proprietary X-Ray engine.

S.T.A.L.K.E.R.: Call of Pripyat

Call of Pripyat is the third stand-alone game in the survival first-person shooter series.

Star Wars: Dark Forces

To its credit, Dark Forces is a good game that doesn't "play itself" like the Rebel Assault games do.

Destroy All Humans! 2

Crypto 137 returns to finish off the human race. The game is set in the 1960s and features five new worlds and co-op multiplayer.

S.T.A.L.K.E.R.: Clear Sky

Clear Sky is the prequel to S.T.A.L.K.E.R.: Shadow of Chernobyl and takes place a year earlier, when the unstable Zone is causing anomalous activity galore.

Dead Island 2

Dead Island 2 is an open world survival experience with visceral close combat, amazing setting and four-player co-op.

New Tales from the Borderlands

Quake

If you're into action games, or even if you're not, you should be playing Quake right now - it's as good as PC gaming gets.

Halo: The Master Chief Collection

The Master Chief Collection brings together four Halo games into one collection for the Xbox One.

PowerSlave

For those who've scorched through the bowels of Doom and Final Doom and burn for more, Power Slave might just quench that fire.

The Callisto Protocol