Co-op games like Mare Nostrvm
Below are 5 cooperative Steam games similar to Mare Nostrvm, ranked by player overlap and content similarity. Every pick supports cooperative play — online co-op, LAN co-op, or shared/split-screen — so you can play with friends right out of the box. imho.run pulls from the same Steam category data Valve uses internally, so "Co-op" here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Mare Nostrvm page.
Ranked picks
- 1
Wars of Cards: ROMA
Online Co-op alternative to Mare Nostrvm — playable with friends. Shares Strategy with Mare Nostrvm.
Wars of Cards: ROMA is a multiplayer strategy game. Compared with the high-fidelity, brain-burning strategy game masterpieces, Wars of Cards: ROMA adopts a minimalist gameplay of maps and cards, which can easily satisfy the desire of strategy lovers to color the map.
- 2
Total War: ROME II - Emperor Edition
Online Co-op alternative to Mare Nostrvm — playable with friends. Shares Strategy with Mare Nostrvm.
Emperor Edition is the definitive edition of ROME II, featuring an improved politics system, overhauled building chains, rebalanced battles and improved visuals in both campaign and battleEmperor Edition contains all free feature updates since its release in 2013, which includes bug fixes, balancing, Twitch.
- 3
Wargame: Red Dragon
Online Co-op alternative to Mare Nostrvm — playable with friends. Shares Strategy with Mare Nostrvm.
The new reference in RTS at its best! The Wargame series returns to duty, larger, richer and more spectacular than ever before. In Wargame Red Dragon, you are engaged in a large-scale conflict where Western forces clash against the Communist bloc.
- 4
Ancient Wars: Sparta Definitive Edition
Online Co-op alternative to Mare Nostrvm — playable with friends. Shares Strategy with Mare Nostrvm.
One of the most innovative Real-Time Strategy Games comes back totally renewed and improved to the smallest detail, with epic large scale battles, new civilizations, unit customization system never seen before in a game, 8K support, and much more.
- 5
Imperivm RTC - HD Edition "Great Battles of Rome"
Online Co-op alternative to Mare Nostrvm — playable with friends. Shares Strategy with Mare Nostrvm.
Lead the battles that forged the greatest Empire of all time. Seven civilizations fighting for glory or freedom: Rome, Aegyptus, Britannia, Germania, Gallia, Hispania, and Carthago. Enjoy the fast-paced RTC “Real-Time Conquest” gameplay, an Old School RTS oriented to military conquest.