Up, Down, Left, and Right refer to the D-pad, L3 and R3 refer to the left and right joystick buttons.
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Unlock All Characters. At the title screen, input: L1, R2, L2, R1, Right, Left, L3, R3.
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Unlock Stronger Story Mode Characters. At the title screen, while holding L1 and R1, input: Left, Left, Right, Right, Up, Up, Up, Up.
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Unlock All Missions. At the mission select screen, input: L1, R1, L2, R2, Right, Square, L3, R3.
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Unlock All Mission Layouts. At the mission select screen, input: R3, L3, R2, L2, R1, L1.
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Unlock All Items. At the item select screen, while holding down R1 and L1, input: Up, Square, Square, Left, Square, Square, Down, Square, Square, Right, Square, Square.
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Unlimited Item Capacity. At the item select screen, while holding L1, L2, R1 and R2, input: Square, Square, Square, Up, Left, Down, Right, Square, Up, Right, Down, Left.
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Increase Items. At the item select screen, while holding R2 and L2, input: Square, Square, Square, Up, Left, Down, Right.
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Show Time & Score. While playing, pause the game, then with the second player's controller, input: Right, Right, Left, Left.
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Increase Score (+100). While playing, pause the game, then while holding L1 and R1 with the second player's controller, input: Right, Right, Left, Left.
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Turn Special Abilities On/Off. While playing, pause the game, then while holding L1 and L2, input: Up, Up, Down, Down, Release L1 and L2, Square, Square, R1, R2.
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Increase Kanji. While playing, with the second player's controller, input: Up, Up, Down, Down, Square, Square, Square.
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Control Nearest Enemy. While playing, pause the game, then with the second player's controller, input: L1, R3, R1, L3, Right, Square, Up, Square, L2, Left, Square, Down, R2.
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Recover Health. While playing, pause the game and input: Up, Down, Right, Left, Square, Square, Square.
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Unlock "B-Side" Audio. At the title screen, while holding L1 and R2, input: Down, Square, Up, Square, Right, Square, Left, Square.
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Unlock "Through The Portal" Stage. At the title screen, input: L1, Up, R1, Down, L2, Right, R2, Left.
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Play Demo Level. At the title screen, input: Up, Down, Right, Left, X, X, X.
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Reset Game. While playing, hold: R1, R2, L1, L2, Start, Select.