Alternatively you can earn specials by completing the game in various ways. These will not happen if you enter the controller type codes during your first. Most features are unlocked by completing all gold medals and goals with different characters. For example, do this with Officer Dick and you'll get Disco Mode. Oh by the way you get to play as Officer Dick if you complete career mode (all goals and gold medals) with your custom created character! Another one you may like is to play as Wolverine, you can do this by getting all the gaps in each normal level in career mode.