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Is Sanctum multiplayer or co-op?

Yes — co-op. Sanctum is a tower defense game released in 2011, 89% positive on Steam (3,302 reviews), with 4 playing right now. $9.99 on Steam.

Co-opSingle-player tooStrategy · Tower defense

You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to…

How Sanctum plays with friends, according to Steam

Online co-op
Not listed on Steam
Local / split-screen co-op
Not listed on Steam
Online PvP
Not listed on Steam
LAN play
Not listed on Steam
Cross-platform multiplayer (Windows / Mac / Linux)
Yes
Single-player mode
Yes
Controller
Partial controller support

Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.

Steam tags: Tower Defense, FPS, Strategy, Co-op, Action, Indie, Sci-fi, Multiplayer

Do you and a friend both own Sanctum?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Sanctum is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Do you and a friend both own Sanctum?Free, no login — uses public Steam profiles.

Or open the Steam store page.

Games like Sanctum you can play together

Bloons TD 6
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Dome Keeper
Tower defense · 92% positive on Steam (16,212 reviews) · 402 playing right now
Dungeon Defenders II
Tower defense · 77% positive on Steam (21,823 reviews) · 351 playing right now
Dungeon Defenders
Tower defense · 93% positive on Steam (18,060 reviews) · 284 playing right now
Orcs Must Die! 3
Tower defense · 86% positive on Steam (14,083 reviews) · 161 playing right now
Age of Darkness: Final Stand
Tower defense · 77% positive on Steam (9,463 reviews) · 176 playing right now

Tired of Sanctum? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Sanctum co-op?
Yes, Sanctum supports co-op.
Does Sanctum have PvP?
Steam does not list PvP for Sanctum.
Do we both need to own Sanctum to play together?
Yes. Sanctum is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.
How many people play Sanctum?
About 4 players were in-game when this page's data was last refreshed (2026-09-09).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; page updated 2026-09-23. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. Ready Up is a Somebody Decide program. How the data works · Legal & privacy · All types · Game Pass