Sega has generously donated to the catalog Sonic CD and Happy Sonic! Live Wallpaper, which retail on the Play Store for $2.99 and $.99, respectively.

It replicates the original Sega CD's functions without requiring a laser-driven disc drive while also remaining compatible with that add-on's peculiar system-communication style.

Sega fans are noticing that several classic games are now unavailable on mobile. Without much warning, Sonic CD, Sonic the ...