Frenetic 2D action in the style of Space Invaders! Customize your ship, face hordes of enemies, and challenge yourself in the first 10 levels of Arcade mode. Upgrade your ship with enhancement cards and face unique challenges in every battle!
Common questions
Is it really free?
Yes. Space Defense Special Force - The Origin of Union is free right now on Steam, with nothing to pay.
Is this the full game?
No. A demo is a portion of Space Defense Special Force - The Origin of Union — usually the opening section — published so you can try it. It is free permanently, but it is not the complete game.
Where do I claim it?
On the official Steam page. We link straight there — we never host game files or act as a middleman.
More demos on Steam
4| Time left | Cover | Title | Type | Store | Was | Action |
|---|---|---|---|---|---|---|
| Ends 31 December 2026 at 23:59 UTC |
|
DAVE THE DIVER - Godzilla Content Pack | DLC | Steam | — | Claim DAVE THE DIVER - Godzilla Content Pack on Steam, opens a new tab |
| No deadline |
|
Explosive Odds - Supporter Pack | DLC | Steam | — | Claim Explosive Odds - Supporter Pack on Steam, opens a new tab |
| No deadline | Plague Lords: Witch Hunt | Free to play | Steam | — | Claim Plague Lords: Witch Hunt on Steam, opens a new tab | |
| No deadline | Before Your Eyes | Free to play | Steam | — | Claim Before Your Eyes on Steam, opens a new tab |