赤い点を消えるまでみて壁または天井を見て瞬きをするとワドルディが見えてきます! Look at the red dot until it disappears. Then look at a wall or ceiling and blink several times. Then, you will be able to see a Waddle Dee!
Nintendo HAL Laboratory こう言う企画をするユーチューバー Youtubers that does these kind of things.