Wily Castle, named Wily Base (ワイリー基地 Wairī Kichi?) in Japan, is a stage based on Dr. Wily's fortress from the second game in the Mega Man series. The stage was introduced in both versions of Super Smash Bros. for Nintendo 3DS and Wii U as a starter stage, with a few differences: the Wii U version takes place at night, while the 3DS version takes place during the day.