While visiting Flicky Island, Sonic notices that the Flickies, his small, feathered friends that can travel between parallel worlds, were captured and turned into badniks (the robot enemies of Sonic) by Dr. Robotnik in his never-ending quest for the Chaos Emeralds. Seven levels separate Sonic from the final showdown with Robotnik.
The title, considering the era it was released, is somewhat misleading, as instead of full blown 3D graphics it uses an isometric view where Sonic can move not only forwards and backwards, but also left and right.
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Gameplay is much slower when compared to other games in the series, and the number of badniks is reduced to five in each section. As usual, when Sonic destroys one badnik, an animal leaps free from its insides, but this time Sonic has to pick him up and lead them to an interdimensional ring.
While they can be taken one by one, exploring the level with all five allow the player to reach for otherwise inaccessible continue tokens. Unlike all other previous games, time isn’t a requirement: if the player completes a level in more than 10 minutes, it would only mean there would be no time bonus at the end.
Finally, to collect all seven Chaos Emeralds, Sonic first must find Tails or Knuckles and offer them at least 50 rings.