If the goal is simply to play with someone in the same room, Serious Sam 3 natively supports up to 4-player split-screen on a single PC.
This method is for those who have a DRM-free copy (e.g., GOG version) or an unpacked version. Note: I do not condone piracy , but this information is provided for educational use with legally owned copies that have been modified. how to play serious sam 3 multiplayer lan without steam
: Rename the original steam_api.dll (or steam_api64.dll ) to something like steam_api.dll.bak . Copy the Goldberg version into this folder. If the goal is simply to play with