Viewtiful Joe Double Trouble - Platform: Nintendo DS

V-Rated mode:
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Successfully complete single player mode under the Adults difficulty setting.

Defeating Bosses:
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One technique that is particularly helpful against most of the Boss stages is to 
use the Slide attack. Use Slow + Slide repeatedly. This does a decent amount of 
damage in a short time. You can hit the Boss four to eight times if you are fast 
enough, while the Slow adds more damage to each attack.