Classic Marathon Infinity
From the team that brought you Aleph One, the classic sci-fi FPS Marathon Infinity from Bungie on Mac revived for modern hardware by the fan community.
88% positive of 288 reviewsPlaying now: 3Free
2.5D · Sci-fi games to play together
15 2.5D · Sci-fi games your group can play together online, including Classic Marathon Infinity, Classic Marathon, and Classic Marathon 2.
All games: 15
Classic Marathon
From the team that brought you Aleph One, the classic sci-fi FPS Marathon from Bungie on Mac revived for modern hardware by the fan community.
90% positive of 1,304 reviewsPlaying now: 5Free
Classic Marathon 2
From the team that brought you Aleph One, the classic sci-fi FPS Marathon 2: Durandal from Bungie on Mac revived for modern hardware by the fan community.
92% positive of 428 reviewsPlaying now: 2Free
Duels of Fortune
A crazy, explosive fighting game with an expressive combo system and a diverse character roster! Play as superhumans, skeletons, aliens, and even stick figures! Battle dangerous foes, take part in lots of exciting singleplayer modes, throw your opponents into the sun, and so much more!
94% positive of 171 reviewsPlaying now: 2Free
Radiant Silvergun
Set on the earth and in space on July 14, 2520 A.D., the film explores the mystery of mankind's extinction. Various terrains become battlefields. Enemies attack from all directions. There are 23 bosses in total. Aim for a high score by making full use of score bonuses and level-up weapons!
93% positive of 217 reviewsPlaying now: 1$19.99
Galaxy Life
The universe is full of Starlings, tiny orange aliens that want to take over the galaxy. Create your own space colony, fight epic battles and discover new planets. Train your soldiers, develop your technology and create unimaginable gadgets. Enjoy this huge social game with friends!
91% positive of 8,625 reviewsPlaying now: 255Free
Terraforming Mars
The taming of the Red Planet has begun! Corporations are competing to transform Mars into a habitable planet by spending vast resources and using innovative technology to raise temperature, create a breathable atmosphere, and make oceans of water.
70% positive of 5,219 reviewsPlaying now: 339$19.99
Sine Mora EX
Sine Mora EX is a side-scrolling shoot'em up that provides a unique challenge, where time is the ultimate factor. Mixing classic shooter sensibilities with contemporary presentation, Sine Mora EX is a gorgeous shoot'em up offering both a Story Mode that weaves an excessive tale and an Arcade Mode.
65% positive of 466 reviewsPlaying now: 1$9.99
DOOM + DOOM II
Developed by id Software, and originally released in 1993 and 1994, the definitive, newly enhanced versions of DOOM + DOOM II are available as a combined product.
95% positive of 25,692 reviewsPlaying now: 316$9.99
Rogue Stormers
An action packed platform shooter mashed-up with roguelike and RPG elements, crazy 3D graphics and co-op multiplayer for one to 4 players.
65% positive of 650 reviewsPlaying now: 0$19.99
G-Darius HD
You will see the creation of new lives... Capture enemies and fire them back at their allies as enormous beams of energy in this horizontally scrolling shooting game, featuring 5 versions of G-Darius with new features, enhancements, and Steam exclusive extras!
93% positive of 162 reviewsPlaying now: 0$29.99
Survivor Mercs
Purge the billionaires' robot army with your Merc squad! Fast-paced twin-stick action, frantic horde survival, tactical squad-building & tons of loot! Exploit game-breaking synergies to beat the M.E.G.A. Corp. bosses in ever-changing operations. Lock, load, and loot, Commander!
69% positive of 146 reviewsPlaying now: 0$9.99
Ray’z Arcade Chronology
Lock-on to an exhilarating sci-fi shooting fest with the trilogy which put Taito on the 90s arcade shooting map: The Ray Series, together in one collection for the first time!
89% positive of 111 reviewsPlaying now: 0$49.99
Time Commando
For retro gaming lover, discover a jewel of 1996: Time Commando Let's fight across 9 time periods: prehistoric, Roman, feudal Japan, Medieval, Conquistador, the Wild West, and the modern wars
93% positive of 111 reviewsPlaying now: 0$5.99
Truxton Extreme
Take down hordes of alien invaders with your Power Shot, Truxton Beam, Thunder Laser, Homing Shot, Star‑mine Shot, and more! Don't forget to breathe as you face off against gigantic bosses in the ultimate battle for humanity’s survival!
93% positive of 101 reviewsPlaying now: 0$24.99