Perhaps you’ve seen the amazing Retro Duo NES/SNES Game System we sell that allows you to play old NES or SNES games. But do you also have a lonely pining in your heart for Altered Beast and Sonic the Hedgehog? Yep, so do we. Which is why we snapped up this GEN-X Game system which surprisingly plays old Sega Genesis and NES cartridges. You would think that Mario and Sonic might get into a brawl considering they are crammed into the same console, but amazingly they coexist peacefully and the included controllers work well for games from either system. Simply connect the GEN-X system to your TV, dig up some old cartridges and pop them into the appropriate slot to start playing.
— ThinkGeek :: GEN-X Genesis/NES Game System
This is an unholy abomination that must be destroyed. What the fuck were they thinking when they built this thing? Surely the end of times is near!