Super Mario 128 refers to a series of development projects that were originally to be used only to create a sequel to Super Mario 64. What was displayed in the Super Mario 128 demo shown at Nintendo's Space World trade show was the rapid generation techniques that were later incorporated into games such as Pikmin, and "sphere walking" technology used in The Legend of Zelda: Twilight Princess and Super Mario Galaxy. Other aspects include physics technology that was later incorporated into Metroid Prime and Super Mario Galaxy 2.