Alternate Intro- Hold A or B and turn on the N64 to view two different introduction sequences after the DMV man appears.
Bonus game- To activate a bonus game (a cross between Asteroids and Defender), press Down, Up, Z, L, Down, Left, Z, Down at the Zone Select screen. If you did it right, you will hear a tone. Now enter any zone, then exit and return to the Zone Select screen. Cycle through the Zones and the bonus game should be there.
Enter the following at the Zone Select screen:
Recharge energy- C-Left, L, Z, Down, L, Z, C-Left, C-Right.
Open Europe- Up, Down, L, Z, Down, Up, Z, Down.
Open Ice- Up, Down, Z, L, Down, C-Right, Z, Down.
Open Jungle- Up, Down, L, Z, Down, C-Left, Z, Down.
Open Desert- Up, Down, L, Z, Down, Left, Z, Down.
Open Final Stage- Up, Down, L, Z, Down, Right, Z, Down.