All codes must be entered with the joypad in the Options menu. If a code doesn't work, exit the Options menu and re-enter it. L and R are the buttons on the front of the joypad.

"YYYXAAAB" - Invisible walls
"XABYYBAX" - Crazy Ball
"BARBYL" - Curve Ball
"BABBBBBBBB" - Super Kicks
"AAAAAYYYYY" - Super Goalie
"AABBYYXX" - Dream Team
"AABBYYZZ" - Dream Team (alternate)
"LLLLLRL" - Super Defense
"RRRRRLR" - Super Attack
"SMILERRULEZ" - Player 2 cannot shoot