Enable the "Additional 100,000 gold" code a few times and the "Invincibility" code. Buy a new ship at the beginning of the game and complete all your objectives for Oxbay. Then, sail to Redmond. After you tell the governor about the attack on Oxbay, sail back there. Continue to attack the fort. Since you are invincible, you will not die. About every other time you attack the fort, you will gain a level. This works best with the Class 1 Battleship.