Unlimited items
At times, you may approach an item and press [Space], before continuously tapping T to obtain an unlimited number of that item.

Unlimited keys
Save the game after entering a dungeon or cave. Move through your location until running out of keys. Restore the game to resume with the doors remaining open and a new set of keys.

Unlimited bravery points
Jump on the turtle and keep attacking it.

Increased luck
Locate the Sorceress on the island with the Crystal Castle. Use the "Ask" command several times to increase your luck to 65.