Sega has sold more than 350,000 copies of Sega Mega Drive and Sega Genesis games on Steam worldwide since the end of April, the company said in a press release. That's the most Sega has sold of its classic games library since the "early '90s," and it's got the release of official mod support to thank.

Sega launched Genesis & Mega Drive Classics Hub on Steam on April 28, a community where people can find and share user-generated content based on these old-school titles. Sega fans can upload ROM hacks of classic Sega games that come with custom, modded features.

The free mod support means anyone can share or download games like Knuckles in Sonic 1, Streets of Rage 2 Except It Makes That Weird Tim Allen Noise When People Die, Gunstar Heroes — Chill Edition and other remixed versions of '90s favorites. Sega said there are hundreds of custom hacks available on the Steam Hub.

For its part, Sega expressed excitement about the popularity of the Steam Workshop feature.

"350,000 sales is a phenomenal achievement for content which is over 20 years old," said James Schall, Sega Europe's director of digital distribution. "It shows that there's still a huge following out for the Sega Mega Drive and Genesis, reinvigorated by the fantastic community of modders out there uploading great content."