Adventure Island/Items

Fruit
Fruit are more than bonus points, they keep you alive. As you play through the game, your vitality meter slowly wears away. Collecting fruit will replenish bars in your meter.

Visible Eggs
Eggs appear throughout each stage. In order to obtain the contents they hold, you must crack them open. You can do that two ways. The first is by crashing into them as you run. This will send the egg flying forward, and the contents will pop out. However, if the egg falls into a pit or the water, you won't be able to collect the item. The other way requires that you have a weapon. If you do, you can simply throw your weapon at the egg. The first hit will crack it, and the second hit will break it open where it lies.

Hidden Eggs
Hidden eggs are invisibile, and are thus very hard to find. The only sure fire technique to tell where they are is to throw a weapon ahead of you as you run. If you notice the weapon hit something and disappear prematurely, chances are it's hitting a hidden egg. To reveal a hidden egg, you must jump at the location where you believe an egg is hidden. If you're right, the egg will appear, and you can open it like normal. ''Hidden Eggs are a unique feature to Adventure Island. As such, Wonder Boy does not contain hidden eggs.''