The Metal Slug series has been a staple of the run-and-gun action genre since its debut in 1996. Developed by SNK, the series has seen numerous releases across various platforms, including the PC. For fans looking to relive the nostalgia of the original games, the Metal Slug Collection is a must-have. However, some users may encounter issues with finding a valid serial number to activate the game on their PC. In this blog post, we'll explore the Metal Slug Collection PC serial number and provide some helpful tips.