Streets of Rage 2
2 Player:
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At the title screen hold Right and B on Controller 1 and hold Left
and A on Controller 2. Press C on Controller 2 with everything else
still held down. Now both players can be the same person in 2 Player.
More Lives:
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Go to the main menu. Hold down (A) + (B) on controller 2 while selecting
Options. You can now select how many lives you start with (up to 9),
choose your starting stage, and play at the Very Easy and Mania difficulty
levels.