Is Day of Defeat: Source co-op?

Steam's store page doesn't flag a co-op category, but players tag Day of Defeat: Source as co-op.

Does Day of Defeat: Source have PvP?

Steam's store page doesn't flag a PvP category, but Day of Defeat: Source is tagged Team-Based — it's player-versus-player.

Do we both need to own Day of Defeat: Source to play together?

Yes. Day of Defeat: Source 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 Day of Defeat: Source?

About 238 players were in-game when this page's data was last refreshed (2026-09-09).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Shooter › Tactical & milsim

Is Day of Defeat: Source multiplayer or co-op?

Yes — co-op and PvP. Day of Defeat: Source is a tactical & milsim game released in 2010, 92% positive on Steam (22,689 reviews), with 238 playing right now. $9.99 on Steam.

Online multiplayerShooter · Tactical & milsim

Valve's WWII Multiplayer Classic - Now available for Mac.

How Day of Defeat: Source 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

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: FPS, World War II, Multiplayer, Action, Shooter, Military, War, Team-Based

Do you and a friend both own Day of Defeat: Source?

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

Or open the Steam store page.

Games like Day of Defeat: Source you can play together

Tom Clancy's Rainbow Six Siege

Tactical & milsim · 84% positive on Steam (1,398,584 reviews) · 51,847 playing right now

Arma Reforger

Tactical & milsim · 76% positive on Steam (30,623 reviews) · 11,466 playing right now

Squad

Tactical & milsim · 83% positive on Steam (210,551 reviews) · 9,116 playing right now

Arma 3

Tactical & milsim · 90% positive on Steam (283,264 reviews) · 7,181 playing right now

Ready or Not

Tactical & milsim · 89% positive on Steam (236,196 reviews) · 4,296 playing right now

Hell Let Loose

Tactical & milsim · 82% positive on Steam (137,677 reviews) · 3,380 playing right now

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

Quick answers

Is Day of Defeat: Source co-op?: Steam's store page doesn't flag a co-op category, but players tag Day of Defeat: Source as co-op.
Does Day of Defeat: Source have PvP?: Steam's store page doesn't flag a PvP category, but Day of Defeat: Source is tagged Team-Based — it's player-versus-player.
Do we both need to own Day of Defeat: Source to play together?: Yes. Day of Defeat: Source 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 Day of Defeat: Source?: About 238 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