| Cause | Explanation | |-------|-------------| | | Steamworks API requires the Steam client to be running in the background. | | Missing or mismatched Steamworks DLLs | steam_api.dll or steam_api64.dll is missing, outdated, or incompatible with the game version. | | Incorrect app ID | The game expects a valid Steam App ID; if missing or invalid (e.g., using SpaceWar default), initialization fails. | | Launching outside Steam | Running the game’s .exe directly instead of through Steam’s library. | | Corrupted Steam client or game files | Missing dependencies, corrupted manifests, or incomplete installation. | | Anti-cheat interference | Some anti-cheat systems block or delay Steam API initialization. | | Network issues | Steam API needs to communicate with Steam backend; strict firewalls or offline mode can cause this. |