Can cause instability or crashes if the game version doesn't match the fix version.

It generally works by replacing or adding specific Dynamic Link Libraries (DLLs) like steam_api64.dll to bypass standard online checks, allowing the game to recognize local players on the same network.

May be flagged by security software as a "trojan" or "crack" due to the nature of the DLL modifications. Shieldwall Game Review

Unlocks multiplayer features for offline/local environments. Small file size and relatively simple installation.