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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.

Unreal Tournament

Unreal Tournament is an online FPS from Epic Games and GT Software. Its main competition being Quake 3, it distinguishes itself from the Quake games by focusing on team-based games such as team deathmatch, capture the flag, and assault, rather than free-for-all deathmatch.

Deus Ex

Deus Ex is an FPS/RPG hybrid from Ion Storm and Eidos Interactive. It is most notable for its free-form skill-based gameplay, which allows nearly unlimited solutions to missions, often allows for multiple outcomes, and lets you shape your character to be best suited for your style of play by allowing you to develop the skills of your choice.

Condemned: Criminal Origins

What twists the mind of an ordinary human into a serial killer?

Assigned to the Serial Crimes Unit, Agent Ethan Thomas must answer this question, and bring the worst of society to justice. His solve rate is the best in the bureau....perhaps too good.

The Wheel of Time

The Wheel of Time is a fantasy-themed 3D shooter based on the novel series of the same name by Robert Jordan. Combat is ranged, but the player character doesn't use any weapons and instead relies on artifacts called "ter'angreal". There are 40 types of ter'angreal in the game, which can be used for offensive as well as defensive purposes, e.g. shoot lightning and fireball, heal or hide the protagonist in a cloak, etc.

FlatOut

FlatOut (a.k.a. FO or FO1) is a racing video game developed by Finnish Bugbear Entertainment and published by Empire Interactive and Vivendi Universal Games in 2004 and 2005. Gameplay in Flatout places emphasis on demolition derby-style races, and features a sophisticated physics engine. 16 different cars are included, each with 5 different skins for them. The game is most known for car drivers flying through the windshield, either from smashing into non-movable scenery at high speed, or deliberate ejection in the Grand Slam Stadium.

Need for Speed: Most Wanted

NFS:MW is an installment in the long-running NFS series. Breaking with many other racers, NFS:MW has a strong focus on a storyline and narrative, even if the story itself is thin.

Max Payne

The game features a gritty neo-noir style and uses graphic novel panels (with voice-overs) in place of cutscenes to narrate the game. Max Payne is heavily influenced by the Hong Kong action cinema genre, particularly the work of director John Woo.

Rollercoaster Tycoon 3

RollerCoaster Tycoon 3 is a strategy and simulation computer game. It is the third installment in the RollerCoaster Tycoon series, first released on October 26, 2004 in North America. RollerCoaster Tycoon 3 places players in charge of managing amusement parks; rides can be built or demolished, terrain and scenery can be adjusted, and prices can be controlled to keep visitors or "peeps" happy.