Sonic 3 + Knuckles
(Sonic 3 with sonic and knuckles added on)
Simply THE BEST. Cmon guys, HYPER SONIC AND SUPER TAILS! (Not super sonic!)
Also, Streets of rage 3, Lion King (awesome, underated), and suprisingly batman forever! Such a great side scroller!
Oh, while I'm at it......
Mortal Combat
Super Street Fighter 2
NBA JAM t:2 edition
Rise of the Robots
(Ok I was joking with that one
)