Overview

Part of a Canadian Kelloggs cereal promotion.

According to twistypuzzles.com:

This puzzle was part of a promotion for the Canadian Kelloggs cereal company. Large format boxes of five different brands of Kellogg's cereal (Fruit Loops, Rice Krispies, Frosted Flakes, Corn Pops, Raisin Bran) each included one of the six different puzzles. After three or four months of the promotion (during which it was almost impossible to find these boxes in stores), Rubiks.com also began selling the puzzles. The instruction booklet contained in the boxes were all identical, and showed the Anakin Skywalker / Darth Vader Head.