God difficulty -
Complete level 10 on 'Hard' to reveal the 'God' difficulty setting. You
can play through the whole game or use Stage Select to warp right to
level 10.
Sound Test -
Set a high score in the Normal, 2-Minute, and 5-Minute modes with ALL 3
ships.
How to Unlock
"Boss on Parade" mode Complete the game (any difficulty)
"Stage Select" mode Clear "Boss on Parade" mode