Best Amusement Parks in Japan

Tokyo Disneyland and Disney sea, surely everyone has heard of it, but do you know that Japan has other unique amusement parks?  There are a lot of amusement parks spread throughout Japan, many of which were closed down during the bubble economy, luckily most of the interesting amusement parks stayed in operation. Nikko Edomura for example, an amusement park with Samurai theme to it.  Here is a list of Japanese best amusement parks that are absolutely worth spending your day in.