Prospekt is a fan made sequel to Half-Life: Opposing Force that Valve is allowing to be distributed through Steam. Priced at $10 (USD), the release is set for February 11 and will return players to City 17 from Half-Life 2.

You can actually pre-order it right now for a 10% discount.
Prospekt begins in the Nova Prospekt prison in the Half-Life universe. Gordon Freeman is slowly being overrun by soldiers in the prison, however unknown to him his Vortigaunt allies manage to find some help from a forgotten hero.

• Substantial, highly-polished and totally new addition to the Half-Life 2 universe, comparable to Half-Life 2: Episode One in length
• Developed by one person, 25 year old Richard Seabrook
• Official Valve approval for Half-Life 2 license and assets
• Standalone PC game built using the Source engine - no requirement for Half-Life 2
• Continues the story of Opposing Force, Gearbox Software’s (Borderlands) update that tells the original Half-Life 2 story from the perspective of the Marines. Gordon
• Freeman is cornered and being overrun by soldiers in the Nova Prospekt prison; the player controls US Marine Adrian Shepherd - the unsung hero - as he’s teleported in by Freeman’s Vortigaunt allies to help fight back.
• 13 new levels featuring fully-scripted puzzles and action sequences, all carefully integrated into the Half-Life 2 story

• Substantial graphical updates over the original game, including but not limited to:
• New Textures
• New Models
• Updated high resolution combine soldier skins with improved normal mapping
• Updated high resolution textures
• Updated lighting
• Higher resolution models
• Increased cube mapping
• Over 20 new particle effects
• Modded HUD
• Modded VGUI
• New player model skin
• Return to Xen
• New voice acting
• New music
• New AI improvements, such as soldiers attempting to undo the player’s actions

I suppose if this keeps up, Valve will simply get to the point where the fans themselves make and release Half-Life 3 through Steam.

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