https://store.steampowered.com/app/236370/Interstellar_Marines/
Interstellar Marines is an immersive tactical sci-fi First Person Simulator in the making, offering a unique blend of tactical gameplay, dynamic environments and non-scripted AI. Play Singleplayer or Co-op/PvP on servers around the world.

The key has no territorial restrictions - REGION FREE and is suitable for activation in any country.