Adventure Island Codes and Secrets (Wii)

Adventure Island, also known as Hudson's Adventure Island, is a video game for the Nintendo Entertainment System and certain other platforms, first released in Japan for the Famicom on September 12, 1986 and MSX in 1986. The North American NES release came in September, 1988, and the game was released as Adventure Island Classic on the European NES in 1992. Developed by Hudson Soft, the game was an adaptation of the arcade game Wonder Boy, which was ported to Sega home gaming systems under its original name, except for the North American release of the Game Gear version, where it was called Revenge of Drancon.

Adventure Island would go on to found a successful video game franchise with many sequels. For trademark reasons, Hudson Soft renamed the game, and revamped the main character to be Takahashi Meijin, who is executive of Hudson Soft. In the English language version they dubbed him "Master Higgins". Wonder Boy, Adventure Island, and Revenge of Drancon (the latter title was used on the American release of the Sega Game Gear version, because a Wonder Boy sequel had already been released on the system) are essentially the same game. (Wikipedia)

Codes

Get to the world you like!
When you are at the main menu, you can put in a code that let you teleport to any other world (1-8).

The code:

ABAB Teleport to another world.

Infinite Lives
Near the end of the first level, before a sign that says ''G'' on it, jump up at the edge of the cliff that's after the platforms. If you find an egg (that contains a bee), you know you've done it. At any Game Over screen from now on, hold UP, A, and SELECT. Then press START. You should reappear in the start of the level you died at with some extra lives. This game has a few versions and the code only works for some versions, oddly enough.

Secrets

See the next boss ahead of time
When you defeat the first boss, pause the game as the first boss leaves the screen. You'll be able to see the next boss.

Here's how the NES version of the game looked back in the days: