Ever since the two Teenage Mutant Ninja Turtles arcade beat ‘em ups from Konami, the heroes in a half-shell have epitomized co-op gaming. Sure, there have been solo titles (including an underappreciated Metroidvania entry from WayForward), but gamers clearly expect co-op from Turtles games. Some later-day cooperatives entries like Mutants in ...

Streets of Rage 4 is a fantastic revival of Sega's classic beat 'em up series, with gorgeous hand-drawn artwork, a memorable soundtrack, challenging gameplay, and both local and online co-op. The only less than stellar thing about the game has been the long wait for new post-release content. Today, Streets of Rage 4 fans can finally take on new challenges as both a free update and the premium 'Mr. X Nightmare' DLC have arrived on consoles and PC.

Two things we can say about Sega Genesis games: they were really hard by today's standards, and many of them were also great games. Sonic, Streets of Rage, Golden Axe, all still worth playing (though many would prefer the arcade version of Golden Axe available on XBLA). PC gamers have lots of options for playing 16-bit Sega games, chief among them (illegal) emulation and legal emulation, i.e. paying for them. The latter crowd will appreciate the sale going on at a place caled DotEmu then. They've bundled 45 Sega Genesis games at the super-low price of $10 for the next few days. Head past the break for the full list.