From #openttdcoop Wiki

This is a place where established #openttdcoop players can show their skills at planning, designing, and building in a fresh and clean environment.

The Pro Zone was conceived as a way to help bridge the gap between members and non-members. Rules for playing on the Pro Zone are the same as for the Public Server. You can expect the plans to be a bit more complex and intricate, or to have special themes.

Anyone who is perceived to be a good Coop Player can be scouted to join this server.

We hope the to Pro Zone will become a thriving part of our community.

You can find the archive of completed games at the ProZone:Archive.