Cheat:
At the main GG entry screen, enter one of the following button sequences to get the corresponding effect.
Up, Down, Left, Right: Secret message 1.
B, A, Left, Right, Select: Secret message 2.
Up, Up, A, B, A, Down, Down: Secret message 3.
Right, Up, Down, Up, Left, Up, Down, Up: Secret message 4.
B, A, B, Right, Left, Down, Up: Secret message 5.
A, A, A, A, B, B, B, Start: Secret message 6.
Right, Left, Right, Left, Down, Down, Up, Up: Secret message 7.
Down, Up, Down, Down, Left, Right, Left, Start: Secret message 8.
A, B, A, B, B, A, A, Select: Secret message 9.
A, Left, Left, A, B, Right, Right, B: Toggles the large fonts upside-down flip.
B, Down, Down, A, B, Up, Up, A: Toggles the small fonts upside-down flip.
Secret words:
At the main GG entry screen, input one of the following words as Code 3, then press A on the first space of Code 1. Note, that "-" means that this character is erased with B button.
DEAD-----: Toggle vertical screen shake.
ABACADABA: Toggle horizontal screen shake. Both codes may be combined.
F154-----: Toggle the main selection cursor into the fish and back into the hand.
FACE-----: Toggle the GG cursor into the face and back into the cross.
1984-----: "Explode" secret message.
BAC4-----: Toggle inversion of D-Pad buttons.
1CE?---?-: Never release D-Pad buttons.
414E5----: Horizontal screen wave effect.
6EE6-----: Vertical screen wave effect