Cheat Mode
When on the overworld, press A, B, B, A, Up, Down, Left, Left, B, A. Now press B + Select to fly anywhere, press A to skip to the next level, or press Start to escape Cheat Mode.
Start new game at Zeus w/ everything (excluding golden apple)
Enter this password at the title/continue screen: ZK5ZJ5F V8DY?X1 4D88B27 7578510.
Start new game at Zeus w/ everything (including golden apple)
Enter this password at the title/continue screen: ?XH4CK3 RXKB1HP SPX7YST H8CXTWN.
Start new game in Tartarus w/ everything (including golden apple)
Enter this password at the title/continue screen: M7T?T8S FLRJZ6W L03XMQC ?KTJH0B.