Ultimate Ninja Storm 3 has two PC versions: the original release and the Full Burst re-release. If you are using the wrong steam_api.dll (e.g., a Base game DLL on the Full Burst exe), you will get a or "App ID Mismatch."
only to be stopped by a "steam_api.dll is missing" error. This system error typically prevents the game from launching because a critical file used to communicate with the Steam client is either gone, corrupted, or blocked. Ultimate Ninja Storm 3 has two PC versions: