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Para Para Paradise: 2nd Mix - each song has a dance routine which you need to learn. You need to acquire a taste for Eurobeat and not be embarassed when people see you dancing 'strangely' (Para Para) on the arcade machine.
Not only that, but because Para Para and the routines for many of the songs are quite feminine, you will get laughed at a lot!
When my local Arcade used to have the first machine back around 2002/2003, I had to be really careful when playing on it, seeing as I live in an extremely chavvy area and well, you get the idea.