じゅうじキー
D-pad (directional keypad on a video game controller, remote control, etc.)
Noun
十字じゅうじキーを上うえへ！するとＢＧＭが変かわり、背景はいけいは魔王まおうの居城きょじょうへ・・・。
Hit up on the D-pad, and the background music will change as the background itself becomes the Demon King's castle....