Hope this saves you some frustration. 👍
If you own a legitimate copy, the serial number follows a specific format. While variations exist between EU and US releases, most keys resemble: metal slug collection pc serial number
Modern digital storefronts like Steam and GOG do not require manual serial entry. Your purchase is automatically tied to your account "key" upon checkout. Hope this saves you some frustration
Don’t. Instead, direct fellow fans to legitimate modern re-releases. Let the old keys rest. metal slug collection pc serial number