Classic NES Series: Super Mario Bros. Cheat Codes (for Gameboy Advance)

[final kaoss]

• Fireworks

Hit the flagpole at the end of a level when the last digit of the timer is 1, 3, or 6.

[final kaoss]

• How to save and continue

When you die press L + R then select "Save High Score". After that you may turn it off or whatever. When you come back to it at the title screen press A and then start. You will start on the first level of the last world you were on.