Peak (the co-op climbing/survival game) supports up to 4 players in a standard online session: you plus up to three friends.

Quick Scoop

  • The official max party size is 4 players in co-op.
  • You can also play solo if you want a single‑player challenge.
  • There is no public matchmaking; you invite friends directly through platforms like Steam.
  • Some community mods can raise the cap well above 4 (often up to around 20 players), but these are unofficial and can be unstable.

So, out of the box: up to 4 people can play Peak together in one game, with higher counts only possible via mods.

Information gathered from public forums or data available on the internet and portrayed here.