Memory Cards are the data storage devices used for the Nintendo GameCube. The amount of memory in a Memory Card is measured by blocks. It takes 57 blocks to open an Animal Crossing save file, plus 1 optional block for NES saves, and 1 block to receive a special letter, containing two NES games, one K.K. Slider song and a piece of furniture. This special present can only be found in the Special Present Memory Card, which was included in new copies of Animal Crossing. These special cards are both gray, and will have either a picture of K.K. Slider or Rover. All Special Present cards are 59 blocks. The Villager variant is a sticker that was included in Nintendo Power #165 to be placed on a regular Memory Card, and does not contain any unique data.