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Serious Sam 3: BFE on PC is heavily integrated with Steam (even retail copies require Steam activation). However, the game includes a native LAN mode that bypasses Steam’s matchmaking servers. To play without Steam entirely, you need a non-Steam version of the game (e.g., a standalone DRM-free copy from GOG.com) or a cracked Steam version (illegal in most jurisdictions). This guide assumes you have a legitimate DRM-free version or are using the game’s built-in LAN option while Steam is in offline mode.
Buy from GOG.com during a sale (often $3–5). Then you can copy the installed folder to any LAN PC without any Steam interaction ever. how to play serious sam 3 multiplayer lan without steam
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