No game in The Legend of Zelda franchise is complete without minigames, some of which can be teeth-grinding in their trickiness; yet somehow we keep coming back. It's tempting to try again, and again, and again in the quest for a heart piece or rupee reward that we don't fundamentally need.
An example in The Legend of Zelda: Majora's Mask 3D is the Mental Training challenge found in the post office, in which you try to count to 10 - exactly 10 - for a reward. When you consider the fact that the counter works to hundredths of a second, you get an idea of the precision required to succeed.
On that topic Nintendo has released another video on its Japanese channel in its series featuring franchise producer Eiji Aonuma, in which he shows off different areas of the game. Aonuma-san - being so cool that he's known to do a random Cucco dance on occasion - is pretty entertaining as he takes this minigame on; he can't help but be amused by the craziness of the challenge.
The video is below, and it's well worth a watch to see more of Aonuma-san at his best.