Sonic CD (MCD)
-Linear stages, removal of past/future poles. the structure would look like this:
Act 1 - present > act 2 - past > (destroying the Robot Transporter and Metal Sonic hologram) > act 3a - good future/(if not) > act 3b - bad future.
-Random positions of the Robot Transporter and Metal Sonic hologram every time you play.
-Spindash like Sonic 2 and 3 (Sonic CD ++)
-Playable Tails as the 2011 version.
(that's easy , only for fun ...)
Michael Jackson's Mooonwalker for Sega Genesis with Mode 1 Sega CD hack. (Like Rn'R Racing)
T.M.N.Turtles The Arcade Game for Sega Genesis with Hyperstone Heist engine and SNES Turtles IV elements .