If you're unable to find your serial number, don't worry! Here are a few options:
: The original retail DVD version is noted to use Tages copy protection.
Modern versions work plug-and-play with Xbox and PlayStation controllers.
What I can offer instead is a helpful that explains legitimate options and how to avoid common issues.
: When purchasing games, it's essential to do so legally to support developers. Serial numbers are typically provided with legitimate copies of the game, either through a physical purchase or a digital storefront.