Unlimited ammunition:
Hold 1 + 3 + 5 + 7 + 8 + 9 at the control options screen. A sound will confirm correct code entry.
Boss fights:
Start a new game and enter 1328 as a code to start at Sector 2. Complete Sectors 2, 3, and 4. Then, enter 1008 as a code to jump to Sector 1. After Sector 1 is completed, the Bosses from all four Sectors will have to be fought in order.
