Factory Default; Score for Maze 20 Only, Marathon or Single.
This is Pirate maze 5 which is unlockable.

Hidden mazes (4 - 6 in each group) are unlocked in Quest Mode by finding the Galaxian Key, using it on the Galaxian Door, and completing the hidden maze. Save your progress at the end of the Quest to have the unlocked maze available for future play.

This is unlocked in:
Level - Corsair's Cove.

Factory Default; Score for Maze 21 Only, Marathon or Single.
This is Pirate maze 6 which is unlockable.

Hidden mazes (4 - 6 in each group) are unlocked in Quest Mode by finding the Galaxian Key, using it on the Galaxian Door, and completing the hidden maze. Save your progress at the end of the Quest to have the unlocked maze available for future play.

This is unlocked in:
Level - Crazy Cannonade.

Factory Default; Score for Maze 22 Only, Marathon or Single.
This is The Ruins maze 4 which is unlockable.

Hidden mazes (4 - 6 in each group) are unlocked in Quest Mode by finding the Galaxian Key, using it on the Galaxian Door, and completing the hidden maze. Save your progress at the end of the Quest to have the unlocked maze available for future play.

This is unlocked in:
Level - Crisis Cavern.

Factory Default; Score for Maze 1 Only, Marathon or Single.
This is Pirate maze 1

Factory Default; Score for Maze 2 Only, Marathon or Single.
This is Pirate maze 2.

Factory Default; Score for Maze 3 Only, Marathon or Single.
This is Pirate maze 3

Factory Default; Score for Maze 4 Only, Marathon or Single.
This is The Ruins maze 1

Factory Default; Score for Maze 5 Only, Marathon or Single.
This is The Ruins maze 2

Factory Default; Score for Maze 6 Only, Marathon or Single.
This is The Ruins maze 3

Factory Default; Score for Maze 7 Only, Marathon or Single.
This is Space maze 1