Viewtiful Joe: Double Trouble
Successfully complete Single Player mode on the Adults difficulty setting to unlock the V-Rated difficulty setting.
A technique that is particularly useful against most of the Bosses 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.
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