Level select:
At the level selection screen, press Up, Left, Down, Right, Up, Right, Up, Down, Left, Up, L1 + R1, L2 + R2
View credits:
At the mission briefing screen, press Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, Up, Down.
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