The Powder Toy Wii is a port of The Powder Toy using SDL Wii. It is separate from not be confused with Powder Toy Wii.
Extract the .zip into your apps folder.
Difference between "The Powder Toy Wii" and "Powder Toy Wii"
Skylark ended development of Powder Toy in mid-2009. FacialTurd made an unofficial branch of the project called The Powder Toy which is still being actively developed. The Powder Toy has many more objects, powders, tools and other features. It also has significant changes to the user interface and engine. It is debatable whether whether Powder Toy or The Powder Toy is a superior program; though most prefer The Powder Toy.