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In America's Army 3, Every Detail Counts™ and as a result, the game has more authentic military elements including training, technology, weapons, and audio than any other military game.

Built on Unreal Engine 3, AA3 delivers stunningly realistic environments, lighting effects, animations, and team-based experiences so that America's Army players can experience how Soldiers train, live, and advance in the Army. Players are bound by Rules of Engagement (ROE) and gain experience as they navigate challenges in team-based, multiplayer, force-on-force operations. In the game, a player's actions and demonstrated Army values are integral to successful mission accomplishment and affect a player's career progression.

To play, simply download and install the Deploy Client, then run it to download the full game.

Free Full PC Game Download (deploy client - 226 KB):
Official link
GamersHell

Featuring online play, Area 51 is set in the U.S. government's most top-secret and secure facility located in the Nevada desert. Players take on the role of Lt. Nick Cross, a hazardous biological waste specialist sent to investigate. During his investigation, Lt. Cross stumbles across alien creatures and becomes infected with a biological mutagen that eventually transforms him into something not quite human. To save the earth and himself, Lt. Cross must fight to solve the enigma of Area 51.

Features extensive Single-Player Campaign: Battle through corridors of Area 51 and attempt to discover the secrets of the extraterrestrial menace before it is too late. Engage in an epic adventure through eight massive sections of a secretive complex. Equip yourself with more than 15 types of human and alien weapons and other equipment as you explore dark corridors. An infectious mutagen gives Lt. Nick Cross alien-enhanced physical abilities but is also slowly transforming him into an alien. Find the cure before it's too late and humanity is lost. Compete against your friends via a four-player split screen and system link through numerous multiplayer game modes including Death Match. Battle online where you can easily access the many systems allowing you to find your friends and set up your own matches.

Free Full PC Game Download (1.93 GB):
Strategy Informer
AusGamers
Big Download

AssaultCube, formerly ActionCube, is a free first-person-shooter based on the game Cube. Set in a realistic looking environment, as far as that´s possible with this engine, while gameplay stays fast and arcade. This game is all about team oriented multiplayer fun.

Free Full PC Game Download (40 MB):
Official link 

The EO and petroid have worked on a Daikatana version, with which anybody is able to play Daikatana online without any restrictions. This version is based upon the patched salesversion of Daikatana 1.2 and includes anything needed for Multiplayer. All singleplayer maps have been removed, of course.

The whole thing is absolutely legal and has been approved by John Romero himself.

Free Full PC Game Download (v1.2.1 - 114 MB):
Official link 

F.E.A.R. Combat is the complete multiplayer component of F.E.A.R. and includes all the updates, additional official maps and additional official game modes all in one downloadable file. F.E.A.R. Combat users will be able to play against the owners of the retail version of F.E .A.R. as well as the other F.E.A.R. Combat users.

Free Full PC Game Download (1.77 GB):
GamersHell
FileFront 

Prometheus is a mission-based, single-player co-op game in the spirit of “Portal” and “Mirror's Edge.” By using the Prometheus Device, players bend the laws of Einsteinian physics using the theory of quantum states, meaning that goals are accomplished by completing missions with your past, present and future selves.

This standalone version of "Prometheus" was created using UDK. You'll need to keep your wits about you and your memory sharp in solving puzzles presented with this unique game play mechanic. Progression through the story introduces new challenges, with tasks increasing in difficulty, and a final dramatic conclusion questions present loyalties and even your own existence.

Free Full PC Game Download (312 MB):
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Voxelstein 3D is an FPS game inspired by Wolfenstein 3D. The game uses Ken Silverman's VOXLAP engine to render voxels in software. The levels in the game are fully destructible - and by fully we mean fully.

The game world is built from tiny cubes called voxels. There are over 37 million in the first level. Rendering a world like this is slow (especially without hardware acceleration), but there is an advantage: voxels can be added, removed or otherwise altered very very quickly. This enables all kinds of cool stuff, including fully destructible worlds!

Free Full PC Game Download (v0.101 - 27 MB):
Official link
GamersHell 

Warsow is a free standalone first person shooter game for Windows and Linux. It is based on the Qfusion 3D engine (a modification of the Quake 2 GPL engine), and aimed on the competitive scene, or the e-sports community.

Warsow is developped under the motto "by gamers for gamers" by a team coming from all kinds of gaming backgrounds. To attain the "by gamers for gamers" spirit, the community are our betatesters, both through internal testing sessions (with community members) and in the feedback on the public releases. We make decisions in close cooperation with the community. However, we do have our own general development direction, and therefor will carefully judge all suggestions and critique made by the community. This way we try to reach a balance between the general consensus on gameplay aspects in the community, and what we feel is best for Warsow's gameplay and concept in the development process. The base gameplay is focussed around the art of movement, meaning moving, speed and tricks play a big part in the gameplay. Besides this, mapcontrol, aim, teamplay and fragging skills play their role too. For the movement we've basicly looked at four games: Quakeworld (legendary for it's speed), Quake3 CPMA, Jet Set Radio and Speedball.

Free Full PC Game Download:
Official link