Fifa Soccer 64
Walk-In Goal
When playing any team but Brazil or the Netherlands in a tournmanent on a breakway, run close to the goalie and then circle around him. He will stand and watch as you walk the ball into the goal.
Easy win
If you are losing in the last minute of the game, hit start and go to controller switch and switch to the other team. Then you will be winning and the computer losing.
Easy Way To Score
When Playing against the computer in FIFA64, When the goalie of the computers team has gotten the ball and is going to kick it away, he'll hold the ball in his hands , take a few steps forward drop the ball and kick it . If you position your player directly in his path and back a few steps, the goalie will kick the ball directly into your head usually resulting in a goal for your team.
Cool sounds
When you are playing in a match, if you press in any direction on the control pad, the crowd will "BOO" the other team. I like to do it when the other team scores a goal.
After you score a goal, experament with the C-buttons to make sounds like the other FIFA games.