Level select/new difficulty levels:
Press Triangle, Square(2), Triangle, Circle(2), Square(2), Triangle, Circle, Square(2) during game play. Exit the current game and start a new game after code entry. The "Ace" and "Insane" difficulty levels will now be available. All levels, including the secret levels, may now be selected.

Keys for all levels:
Press Square, X, Circle, Triangle, X, Triangle, Triangle, X, Triangle, X, Triangle, X during game play.

Better visibility:
Press Square, Triangle, Circle, Square(2), X, Circle, Triangle, Square, Circle, X, Triangle during game play. The screen colors will turn brighter.

Invincibility:
Press Square, Triangle, Circle, Square(2), Triangle, Circle(2), Square, Triangle, Square, X during game play.

Extra life:
Press Square, Triangle, Circle, Square, Circle, X, Square, Triangle, Circle, Triangle(2), X during game play.

Weapons:
Press Triangle, Square, Circle, X, Triangle, Square, X, Triangle, Square, X, Circle, Square during game play in a safe location.

Ten lives, weapons, and level access:
Press Triangle, X, Square(2), Triangle, Circle(2), Square, Triangle, Square, Circle, X during game play in a safe location.

Shields:
Press Triangle(2), X, Square, Triangle, Circle, Triangle, X, Square, X, Triangle, X during game play. A woman's voice will say "Cheater" and the phrase "Shield Recharged" will appear to confirm correct code entry.

Cloaking device:
Press Triangle, Square, X, Circle, Square, X, Circle, Triangle, X, Square, X, Triangle during game play.

Cycle colors:
Press Square, Triangle, Circle, Square(2), Triangle, Circle(2), Square, Triangle, Square, X, Triangle, X, Square, Triangle during game play. Repeat this code for different colors.

Turbo:
Press Square, Triangle, Circle, Square, Circle, X, Square, X, Circle, Triangle, Square, X during game play.

Psychedelic color palette:
Press Square, Triangle, Circle(2), Square, Triangle, Square, X, Triangle, X, Square during game play.

Strange robots:
Press Square, X, Square, X, Circle, Square, Circle, Square, Triangle, Circle(2), Square during game play.

Hint: Locating the secret exits:
Here are some brief descriptions on how to locate the secret exits for the three secret levels in the game.

Level 10
After blowing up the reactor, go back towards the red door. Go through the red door and shoot your lasers at the second panel on the right. The secret exit will open.

Level 21
Go down the hallway near the energy boost. Go past the normal exit and move into the hallway. Move down the long straight passage and back up against the wall. The exit is on the ceiling or floor, depending on your orientation.

Level 24
Leave the reactor room through the red door. You will enter a very tall vertical chamber with the exit at the top. The secret exit is at the same level as the door from the reactor. Just turn around and blast the door until it opens.

2	DBG4B-JB7S7-DS4#Y-MSBYB
3	QQM#B-7B7S7-DHLTQ-8VBXV
4	SGVFB-JM7TB-GNMXG-JWB5V
5	N*5KB-STLVQ-HC344-62B3B
6	Y8FPB-SL3TB-JAM66-S9D2V
7	XORTB-SQGTB-HBMC8-VBF#B
8	RH2FB-NV70*-GBL5Q-*BBBB
9	8SHKB-9WLT*-JPLD8-NCCKB
10	BBBLB-DV3Q3-DBMG*-9BFBB
11	BBBQB-DV3Q3-DBLHS-9B6BB
12	BBBBB-D33Q3-DBMHV-#BGBB
13	BBBGB-D33Q3-DBLJN-#BGBB
14	BBBLB-D33Q3-DBMJ7-#BGBB
15	BBBQB-D33Q3-DBLK1-#BGBB

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