Project Orion

A Sven Co-op map you can host and play in your browser — no download, no Steam client.

Project Orion — Sven Co-op map screenshot

Host Project Orion in your browserBrowse all co-op maps

Project Orion is fetched the moment you press Host, then starts — one button, no separate download step. Friends join from a link; there is no port forwarding, no dedicated server to rent and nothing to install on either side.

Map facts

AuthorIcewolf (original), CubicVirtuoso (ripent conversion)
Released2008
SizeMedium
Map files2 (plays as a campaign)
In your browserDownloads on demand, then hosts
CostFree — no account, no Steam client

Tagged: black-mesa · community-edit · conversion · series · walkthrough

About this map

Co-operative version of the single-player mission Project Orion . Project Orion is a two map series based on the "new" Black Mesa. Orion was the facility created after the Black Mesa cascade three years later.

What to expect

This one is a campaign rather than a single level: it spans 2 map files that run in sequence, so expect to play it as a session rather than a quick round. The author did not record a difficulty for it.

The parts run in this order: project_orion1, project_orion2.

How to play it

  1. Press Host above. The map downloads first, then starts.
  2. Share the room link with whoever you want to play with.
  3. They open it and join — no install, no account, no port forwarding.

This map is not stored here in advance — it is fetched when you press Host and then starts. That happens once; there is still nothing to install. Everyone who joins needs a browser and the link, and nothing else — they do not need to own Half-Life, install the Sven Co-op client or make an account. Because the connection is brokered for you, neither side forwards a port or rents a server.

New to Sven Co-op? Start here → · Playing with friends → · All co-op maps →

More co-op maps

Browse the full index of co-op maps →

Map data from SCMapDB under CC BY-SA 3.0. Sven Co-op is by the Sven Co-op team; not affiliated.

Maps · Game modes · Weapons · Co-op maps · Guides · Tools · How to play · Leaderboard