When doing missions in Grenoble, you can obtain items and give them to the cashier in the building downstairs for a sum of money. However, this takes 100 gold away from the money, where you could take it to any shop, armor, weapons, items, and sell it there for more money while only paying 50 gold to get the item.
Use the following trick to do about 75 points of damage early in the game. Once you on level 10, get a mission in Grenbole. Get every item in the second floor, once this is done, equip the hero with the Broad Sword and power Ring. After you defeat the apprentice, retern to Grenbole and have the sword removed next, equip the power ring and broad sword to Aguro for massive damage. Note: The broad sword drains your life for every attack you make.
Successfully complete the game one time. Then, start a new game and enter TAITO as a name. Gold and experience will be multiplied by two.
Successfully complete the game one time to unlock the "Try Again" option. Select "Try Again" before you start the game. Gold and experience will be multiplied by four.