Once you have your legit Steam key (a 15-digit alphanumeric code), you redeem it in the Steam client (Games > Activate a Product on Steam). That is the you should ever use.
If you have searched for the phrase you are likely a fan of the legendary run-and-gun arcade series developed by Nazca Corporation and published by SNK. You want the complete collection—from the original Metal Slug (1996) to Metal Slug 5 (2003) or even Metal Slug 6 and 7 —on your Windows PC. Serial Number Metal Slug Complete Pc Download
Publicly shared serial numbers (like METAL-1234-ABCD-5678 ) will almost never work for legitimate copies of Metal Slug Complete. Once you have your legit Steam key (a