Level skip:
Press B, A, B, Y, Down, Right, A, L, Down at the start/options screen. Bug will shout "Yike" to confirm correct code entry. Selectable levels include the bosses and dragonfly race. Hold L + Up skip to the next level. Hold L + Down to return to the previous level. Hold L or R + Start to select from levels that already have been played. However, this can only be done a limited amount of times. A counter on the far right side of the screen will display how many times a particular level may be revisited.

Unlimited lives:
Press A, C, B(2), Down, Right, Up at the start/options screen.

Additional continues:
Allow Bug to die after completing the first level. Press Right + Start when the "Press Start" screen appears. Press Right + Start at the "Start Game" screen.

Replay levels:
Hold Up + Start when starting the game. A stage select menu with all previous levels played will appear. Note: The menu will list the number of times play can be restarted from a previous level.