Adventure Island Cheats

After Higgins gets hit by the coconut at the title screen press right, left, right, left, A, B, A, B.

In the third area of the first island, after you pass the frog, climb up the ledge and drop down on the other side. When you land there, jump and an egg will be revealed. Hit the egg and a key will appear. Retrieve the key, and a platform will appear under you and take you to a secret room. Here a dragon will give you the Hudson Bee, which will allow you to keep all of your hammers and dinosaurs if you die.