Many producers put in secret areas or secret equipment in the game to encourage users to play more. Trick codes are often required to access the secrets. The trick codes may be obtained by doing the most unlikely things. The codes are often found quite by accident during the course of the game.
The secrets are difficult to access until the first person release them on the Internet. Some producers take this into account and provide an option to choose to access all the secret codes at once or one at time if you wish to have a go first. An option for releasing the secret codes will not spoil the game for the other players: the point is that this should be optional.
Access to secret areas and equipment can be partly achieved by saving the settings (see 5.3 Settings should be saved).