Released just a year after the first game, Sonic The Hedgehog 2 brings an adventure very similar to the first one in terms of plot. Dr. Robotnik is again on the run to world domination, by using the Chaos Emeralds and his space station called the Death Egg. Sonic isn’t alone anymore, though, as he now has a new companion in Miles ‘Tails’ Prower. At this point in the series, there are no mechanical differences between the two characters, as you can’t control Tails’ flight. But the game introduces ten new levels, special stages, and a really fun competitive mode.