Continue game:
Hold I + II, then reset the game at the title screen. Repeatedly tap or hold Down/Left + Select until the phrase "Continue Mode" appears. The number of continues allowed is equal to this formula: (Score/1,000,000) + 3.

Easy mode:
Hold I + II, then reset the game at the title screen. Repeatedly tap or hold Up/Right + Select until the phrase "Continue Mode" appears. In this mode, power and the units awarded at the end of each level is doubled.

Music test:
Hold I and reset the game during game play, or hold I and reset the game at the title screen. Repeatedly tap or hold Up/Left + Select until the title screen appears. Note: Reset the game to return to game play.

Boss bonus:
10,000 points are awarded if full energy is remaining after defeating the Boss of any level. For each additional Boss defeated with full energy, the point bonus is doubled.