Kirby's primary media form is video games, as he is the star and protagonist of the Nintendo owned series named after him. Most Kirby games are platform games in which Kirby fights enemies, solves puzzles, and challenges bosses. Each game typically adds a new twist or change to Kirby's abilities that the levels of the game emphasize, such as combining power ups in Kirby 64 or Super Copy Abilities in Return to Dreamland. Most games involve Kirby saving a world or even universe from a dark, evil force of some kind. Typical Kirby games have a powerful being, such as Dark Matter or Nightmare, controlling or corrupting a secondary villain.