Sonic the Hedgehog 2 (World) (Rev A) ROM

Sonic the Hedgehog 2 (World) (Rev A) is a Sega Genesis (or Sega Megadrive) game that was developed and published by Sega. You play as Sonic the Hedgehog. Miles "Tails" Prower will follow you wherever you go. You must beat Dr. Robotnik and his forces through several stages.

Following up the awesome first entry on the series, Sega releases Sonic the Hedgehog 2 on 1992. Building up on its predecessor's fame, gameplay and speed, it went to became one of the biggest sellers in Sega Megadrive/Genesis history.
This time, the formula is basically the same from the last installment, however, we got a new face here. Enter Miles "Tails" Prower, a small two-tailed fox (that can be controlled by player 2, or the CPU) who, amazed by Sonic attitude, speed and heroism, proclaims himself the sidekick of our blue hazed hero, while facing again the evils of Dr. Ivo Robotnik (Eggman in Japan), saving the world once again from total domination, via Dr. Robotnik's Death Egg.
However, Sonic changed and got faster. He got himself a new move under his sleeves, the spin dash. With this move he can roll, rev himself up in place and when released, he unleashes his full speed. Tails can do this too, actually.
Also, this time, the Chaos Emeralds are not merely for show or completionism sake. Get the 7 Chaos Emeralds in this installment, quite well hidden inside the half-pipe-like special zones, get 50 rings and jump: Sonic turns himself into Super Sonic, with invencibility (except to crushing, drowning or falling to pits), high jumps, hyperspeed and golden colored fur to match.
With 8 zones, 19 levels in total plus 7 special stages, a free for all with Robotnik's creation, Mecha Sonic and one last boss fight with the Dr. himself, this game is one of the longest, and most remembered entries in the whole Sonic series, sporting several of the most definite moves and gameplay, which would go on to define the shape of Sonic games for years to come.
Finally, to top it all, did you know this game has a 2 player versus racing mode? You can compete with Player 2 on who takes the shortest to complete one of 3 scenes, or who can grab more rings in the special zones.
This special version of Sonic 2 is named Revision A because it was extracted from the Sonic Compilation/Sonic Classics multigame pack, and appeared to be different to the previous version.