Streets of Rage 3 - Platform: Wii

Play as the same character:
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Hold Down+C on controller 2 as you enter 2 PLAYER mode with controller 1. 

Play as Ash:
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To select Ash, defeat him, then hold A on Controller 1. After losing all of your 
lives, you select to continue and you can choose Ash as your character. 

Get Shiva:
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After beating Shiva in the first stage when you get the last hit, press B+Start 
and hold it. When the continue screen comes up you'll be able to play as Shiva. 

Get Roo:
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At the title screen, hold Up and B, then press Start. A kangaroo named Roo will 
now be available at the character select screen. 

Extra Lives Select:
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Go to the options screen and select the ''Lives'' option. Press and hold UP + 
(A) + (B) + (C) on Controller 2, and press LEFT or RIGHT on Controller 1 to 
select the number of lives you can start the game with. You will now be able to 
select 9 lives, past the default max of 5. 

Another way to get Roo:
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When you fight the clown and Roo, defeat the clown first and Roo should hop away 
off the screen. When you lose all your lives and continue, cycle through the 
characters and Roo will now be available. 

Ending 1:
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To get Ending 1, successfully rescue the Chief in Stage 6 before his health runs 
out. Then, at the end of Stage 7, defeat Robot Y before the time limit runs out. 
You will see the true ending. 

Ending 2:
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To see Ending 2, manage to rescue the Chief before his health runs out in Stage 
6. Then, in Stage 7, defeat Robot Y but let the time limit run out. You will see 
Ending 2. 

Ending 3:
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To see Ending 3, let the Chief's health run out in Stage 6. When you go to Stage 
7, you will see that it is changed. Make it to the last boss and defeat him. You 
will see Ending 3. 

Ending 4:
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To see Ending 4 , simply set the difficulty on Easy Level and beat Robot X in 
Stage 5.