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Worms Armageddon

Worms: Armageddon is a turn-based strategy game from Team 17 and MicroProse. You command a squad of worms and must take out one or more opposing squads using an array of heavy weaponry ranging from bazookas and grenades to nukes and doomsday devices.

Total Annihilation

Total Annihilation is a sci-fi themed RTS from Cavedog and GT Interactive. You play as the commander of either the Arm or Core, and fight the other side in an intergalactic war with high tech weapons like giant robots and plasma cannons.

Dreamfall: The Longest Journey

3rd person adventure game with a Sci-Fi protagonist. Very story driven with an emphasis on cinematics.

Unreal Tournament 2004

Unreal Tournament 2004 is an online FPS from Epic Games and Infogrames, and the follow-up to the previous entry Unreal Tournament 2003. Assault mode returns, and a new strategy-oriented mode called Onslaught is added. Possibly more notable are vehicles throughout the maps, some of which require multiple pilots to operate completely.

Far Cry

Upon its release, Far Cry awed the world by beating Half Life 2 and Doom 3 (then most anticipated titles) by being the first of a series of “next gen” first person shooter’s. It was critically and publicly acclaimed for its cutting-edge graphics, AI, and environment, and won further praise for being the first game to support HDR.

Shadowgrounds

A top-down third-person shooter. You are stationed on one of Jupiter's moons which was recently colonized, and are called in to investigate the cause of a power outage. Aliens threaten to overwhelm a nearby colony. Only you stand in their way.

Guild Wars

Guild Wars is an online game with some resemblance to Roleplaying games. It's quite popular, no doubt due to having to pay no monthly fees. The game offers an MMO experience in the different town, where the "countryside" and missions are "instanced."

Rise of Nations: Rise of Legends

Rise of Nations: Rise of Legends is a real-time strategy game for the PC made by Big Huge Games, and published by Microsoft. It is a spin off of the popular game Rise of Nations, released in May 2003. However, rather than being a historical game, it is based in a fantasy world, where technology and magic coexist. It was released on May 9, 2006 in North America and on various dates around May 26, 2006 in the rest of the world.

Half-Life 2

Half-Life 2 is an FPS from Valve Software, and was one of the most highly anticipated sequels of all time. You return as Gordon Freeman, the strong and silent-type physicist, and you must do battle with an alien race of enslavers to liberate the surviving remainder of humanity on earth.
Also applies to Half-Life 2 Lost Coast free downloadable level.

The Chronicles of Riddick: Escape from Butcher Bay

The Chronicles of Riddick: Escape from Butcher Bay is an FPS from Starbreeze Studios and Vivendi Universal. The plot serves as a prequel to the 2000 film Pitch Black, and features Vin Diesel's voice and likeness.