Menu
Pop'n Twinbee
Level select:
Pause game play and press Up, Left, Up, Left, Up, Left(3), Right(3), Down, Left, Down, Left, Down, B.
In the Japanese version of the game, enter RS018 as a name, then hold Select + Y + R until the level selection menu appears.
In the PAL version of the game, enter RH018 as a name, then hold Select + Y + R until the level selection menu appears.
Invincibility:
Pause game play and press A, Y, A, Y, L, R, L, R, X, B(2).
Extra continues:
Pause game play and press A, B, Y, X, R, L, Up, Down, Right, A(3).
Restore energy:
Pause game play and press Select, A, Y, A, Y, X, B, X, B, R(2), Select.
Level 8 difficulty setting:
Enter the "Options" screen, then press Up(2), Down(2), Left, Right, Left, Right, B, A.
Nine Chibi:
Pause game play and press Up(3), Down(3), Left, Right, Left, Right, Left, Right, B, A, B, A, B, A.
Pause game play and press Down(2), Up(2), B(2), X(2), Right, Left, A, Y
.