Is Kerbal Space Program co-op?

Not natively. Kerbal Space Program ships single-player; the community mod Luna Multiplayer (LMP) adds co-op — Shared space program with time-warp syncing; KSP 1 only.

Does Kerbal Space Program have PvP?

Only with the Luna Multiplayer (LMP) mod, which is co-op only.

How many people play Kerbal Space Program?

About 1,844 players were in-game when this page was built (2026-09-08).

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

Multiplayer games › Sandbox & building › Space sandbox

Is Kerbal Space Program multiplayer? Yes — with Luna Multiplayer (LMP)

Not out of the box — but the Luna Multiplayer (LMP) mod makes it co-op. Kerbal Space Program is a space sandbox game released in 2015, 95% positive on Steam (127,162 reviews), with 1,844 playing right now. $39.99 on Steam.

Co-opSingle-player tooMultiplayer via mod: Luna Multiplayer (LMP)Sandbox & building · Space sandbox

How to play Kerbal Space Program with a friend: Luna Multiplayer (LMP)

Shared space program with time-warp syncing; KSP 1 only. Steam lists Kerbal Space Program as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.

Get Luna Multiplayer (LMP)

In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble…

Steam tags: Space, Simulation, Sandbox, Physics, Science, Space Sim, Building, Moddable

Do you and a friend both own Kerbal Space Program?

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

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Games like Kerbal Space Program you can play together

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Satisfactory

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Dyson Sphere Program

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House Flipper 2

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Teardown

Physics sandbox · 96% positive on Steam (109,462 reviews) · 1,984 playing right now

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

Quick answers

Is Kerbal Space Program co-op?: Not natively. Kerbal Space Program ships single-player; the community mod Luna Multiplayer (LMP) adds co-op — Shared space program with time-warp syncing; KSP 1 only.
Does Kerbal Space Program have PvP?: Only with the Luna Multiplayer (LMP) mod, which is co-op only.
How many people play Kerbal Space Program?: About 1,844 players were in-game when this page was built (2026-09-08).

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; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.