Ghost Chaser Densei

Alternate costumes:
After your character dies, hold L + R when choosing a character. Release the buttons after your character reappears.

Unlimited time:
Highlight the desired number of players at the main menu, then press L, R, Right(2), Left(2), then hold L + R. Release the buttons when the character selection screen appears.

Use same characters:
Hold L + R at the battle mode character selection screen to use the same character as the other player.

Level select:

Level 2: Hold L + R + A + B + X + Y + Right on controller two at the mission briefing screen until it disappears.

Level 3: Hold L + R + A + B + X + Y + Down on controller two at the mission briefing screen until it disappears.

Level 4: Hold L + R + A + B + X + Y + Left on controller two at the mission briefing screen until it disappears.

Level 5: Hold L + R + A + B + X + Y + Up on controller two at the mission briefing screen until it disappears.