Powerful World Soccer 3 (N64)

All-star team:
Press Up, L, Up, L, Down, L, Down, L, Left, R, Right, R, Left, R, Right, R, B, A, Z + Start at the title screen.

Big head mode:
Press C-Up(2), C-Down(2), C-Left, C-Right, C-Left, C-Right, B, A, Z + Start at the title screen.