Ikaruga

Unlock Sound Test:
Either complete the game on Easy difficulty without using a continue, or play the game for at least 15 hours to unlock the Sound Test.

Unlock Gallery 1:
Complete Trial Mode without using a continue, or play the game for at least 5 hours to unlock gallery 1.

Unlock Gallery 2:
Complete the game on any difficulty, or play the game for at least 10 hours to unlock gallery 2.