This page contains Sonic The Hedgehog 2 Hints for Genesis called "Use Tails as a key" and has been posted or updated on Jun 22, 2007 by GSarcasm. Let us know what you think of this Hint by thumbs voting.
Use Tails as a key
Use the following trick if you are stuck or just want a huge shortcut. Play an adventure with Sonic and Tails. Whenever you find a one-way door (a door that will open from one way but not for the other), walk in the opposite direction of it so that it is just off-screen. The game will not detect the door because it is not on-screen. Make Tails go past the door off-screen with controller two. Then with controller one, move closer to the locked door. It should be open and you should be able to get past it. This could cut off up to three quarters off a long level.
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