Sega is releasing almost every Sega game from every one of their consoles on iOS and Android
And they're all going to be free.
Today, Sega released the beginning of their 'Sega Forever' initiative, which will have almost every first party game from every Sega system available on iOS and Android devices. This means games from the Master System, Genesis/Mega Drive, Dreamcast, and more. Not only that, every single game will be released for free...with ad-support, of course. New titles will be released every month and this week they've started things off with Sonic the Hedgehog, Altered Beast, Phantasy Star II, Kid Chameleon, and Comix Zone.