First what you do is beat the game in hero challenge mode with any character and in the end you will receive a certain amount of "G" then you go to Tatsumi's Techno Dome and move to the right, then you will see several boxes in yellow, the ones in yellow you can purchase but first you have to withdraw "G". then you will have several options such as more characters or hidden movies with the amount of "G" that you collect.
Beat the game using any characters besides 3(Bolin &Polin, WiseDuck should be 2 of the 3) or beat the game using all the characters. Head back to the techno dome and the 3rd minigame should be available.
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