Singleplayer
This game has a mode where it can be played alone.

Metro 2033 Redux
by 4A Games
In 2013 the world was devastated by an apocalyptic event, annihilating almost all mankind and turning the Earth's surface into a poisonous wasteland.
Genre: Shooter, Stealth, Adventure, Action 
X-Plane 11
The future of flight simulation is now! X-Plane 11 is the detailed, realistic, and modern simulator you’ve been waiting for.
Genre: Adventure, Simulation 
Rocket League®
Soccer meets driving once again in the long-awaited, physics-based multiplayer-focused sequel to Supersonic Acrobatic Rocket-Powered...
Genre: Sports, Action 
Saints Row: Gat out of Hell
Join Johnny Gat & Kinzie Kensington as you tear apart Hell in a quest to save the Boss’ soul.
Genre: Shooter, Adventure, Action 
Saints Row 2
by Volition
Saints Row 2 brings true freedom to open-world gaming.
Genre: Shooter, Adventure, Action 
Ballistic Overkill
Ballistic Overkill is a fast paced PvP shooter.
Genre: Shooter, Strategy, Adventure, Action 
Black Mesa
Relive Half-Life in this highly acclaimed, fan-made recreation
Genre: Shooter, Adventure, Action 
Half-Life: Blue Shift
Made by Gearbox Software and originally released in 2001 as an add-on to Half-Life, Blue Shift is a return to the Black Mesa Research...
Genre: Puzzle, Shooter, Adventure, Action 
Half-Life: Source
by Valve
Winner of over 50 Game of the Year awards, Half-Life set new standards for action games when it was released in 1998.
Genre: Shooter, Adventure, Action