Unlimited items
At times, you can approach an item and press [Space], before constantly tapping T to receive an unlimited number of that item.

Increased luck
Find the Sorceress on the island with the Crystal Castle. Then use the "Ask" command many times to raise your luck to 65.

Unlimited keys
Save your game after you enter a dungeon or cave. Move through your area until running out of keys. Then restore the game to resume with the doors open and a new set of keys.

Unlimited bravery points
Simply jump on the turtle and keep on attacking it.