Again, Dr. Robotnik is plotting to take over the world with his army of animals he’s placed into robots and with the power of the chaos emeralds. Sonic, who has now befriended and teamed up with a new character, Tails, must progress through the levels, collect the emeralds himself, and defeat Robotnik, who this time is operating out of his Death Egg.
Overview
Again, Dr. Robotnik is plotting to take over the world with his army of animals he’s placed into robots and with the power of the chaos emeralds. Sonic, who has now befriended and teamed up with a new character, Tails, must progress through the levels, collect the emeralds himself, and defeat Robotnik, who this time is operating out of his Death Egg.
Source: http://en.wikipedia.org/wiki/Sonic_2
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