At the main screen where you can enter a password, type in these codes one at a time:
Skip To 2nd Round: 10300
Skip To 3rd Round: 30700
Skip To 4th Round: 01500
Skip To 5th Round: 22000
Modify the amount of time the matches last
When turning on the console, keep pressing Select. This resets an invisible time counter to 0. Each time you press the A button, that counter goes up by 1, adding one minute of time for each half of the match (for example, press the A button 2 times to make each half of the match last 2 minutes instead of the usual 4).
Play on a different field on Tournament Mode
Play a "VS Match" and select the field you want to play the tournament on (Bumpy, Soil, Concrete, Sand, or Ice). At the end of the match, simply start playing "Tournament Mode", and the game will be set on the field you selected in "VS Mode". If you don't want to play the "VS Match" against someone, it's recommended to set the the timer to 1:00 minute (in codes section) and let the game play itself.
Super Kick
When you have control of the ball, press B and then A really fast. The ball will change to a purple color, and anything in its way will be knocked down, including the goalie.
Useless Enemies
At the straregy screen before the start of the game, you can choose to tackle or mark the enemies. Choose tackle and during the game, keep knocking down the same enemy or kick the ball at them hard. Eventually after about 3 or 4 hits, the enemy will lay on the field, unable to play.
Level Warps...