Select Network Play > Cooperative or Versus . Choose your map, difficulty settings, and server visibility (Public or Private).
Are you planning to host a or looking for competitive Versus matches? download-serious-sam-3-bfe-build-09052016-online
Note that newer macOS versions (Catalina 10.15+) do not support this game because it is a 32-bit application . Select Network Play > Cooperative or Versus
Find your installation directory. By default, Steam installs it under Steam\steamapps\common\serious sam 3 . download-serious-sam-3-bfe-build-09052016-online
Ensure you have at least a Dual-core 2.0 GHz processor , 1GB RAM , and a DirectX 9.0c compatible graphics card.