Tower defense is easy to understand and great to plan together: who builds where, who covers which lane. These co-op tower defense games on Steam include pure strategy and action hybrids where you fight on the front line yourself.
1. Bloons TD 6
A large 3D tower defense game about popping waves of Bloons. In co-op, friends share the map and defend together, combining their towers and upgrades into one strategy.
Play together: Online co-op
2. Dungeon Defenders
A four-player co-op tower defense action RPG: create a hero from one of four classes and save Etheria. Each class builds different defenses, so a team has to coordinate where everything goes.
Play together: Online co-op, Remote Play Together
3. Orcs Must Die! 2
Grab a friend and slay orcs in huge numbers with traps and weapons. The sequel to an award-winning strategy game, built around co-op chaos and clever trap combinations.
Play together: Online co-op
4. Sanctum 2
A tower defense and FPS hybrid: pick one of four classes and protect the oxygen-producing Cores from hordes of aliens. You build mazes of towers, then fight alongside them.
Play together: Online co-op
5. The Riftbreaker
A base-building and survival game with action RPG elements for up to four players. Build your base, craft weapons and research new technology while fighting off countless enemies.
Play together: Online co-op
6. Legion TD 2 - Multiplayer Tower Defense
A multiplayer tower defense of tactics, teamwork and prediction. Defend against waves and destroy the enemy king before they destroy yours, in parties of one to eight players.
Play together: Online co-op, Online PvP
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