How co-op works
Up to four online players build walls and tower mazes during preparation, then personally defend the Cores in first-person combat. Four classes, separate weapon, tower, and perk loadouts, and shared lane coverage reward complementary roles and coordinated fire.
About this game
Sanctum 2 blends tower defense strategy with first-person shooting, creating a hybrid experience where you build defenses and fight on the front lines. Four distinct character classes bring unique abilities to the fight, each protecting vital oxygen-producing Cores from relentless alien hordes. The gameplay is fully cooperative, demanding that players coordinate both tower placement and direct combat.
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You'll spend each wave upgrading maze-like defenses, choosing tower types, and then grabbing your weapons to mow down anything that slips through. Resource management, lane control, and positioning all matter. The mix of strategic planning and frantic shooting makes every wave feel like a tactical puzzle followed by an adrenaline test, and teamwork turns both phases into something greater.
Online co-op supports drop-in multiplayer across Windows, Mac, and Linux. Communication becomes critical when you're dividing tower budgets, calling out breakthroughs, and covering weak points together. Sessions reward groups that plan, adapt, and stay vocal under pressure.
Similar games
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Co-op shooters built around surviving relentless waves of enemies, where teamwork, positioning, and escalating firepower make the difference between victory and being overrun.
Build defenses, manage resources, and survive waves together in cooperative tower defense games that reward teamwork and strategic coordination.
Frequently Asked Questions
How many players can team up in co-op?
Sanctum 2 supports online co-op for up to 4 players, letting you choose from four unique character classes and defend the Cores together.
Do we need to communicate a lot during co-op sessions?
Yes, communication is critical. You'll need to coordinate tower placement, manage shared resources, call out enemy breakthroughs, and cover weak spots together. The game rewards teams that stay vocal and adapt on the fly.
Can we play cross-platform between Windows, Mac, and Linux?
The game supports online co-op across Windows, Mac, and Linux.
How does the tower defense part work with the shooting?
Each wave has two phases: you first build and upgrade maze-like tower defenses, then grab your weapons and fight alongside your towers to stop anything that breaks through. You're switching between strategic planning and direct combat throughout the match.
Can friends join our game mid-session?
Yes, Sanctum 2 supports drop-in multiplayer, so friends can join your co-op session in progress.