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At the options screen, either during the game or at start-up, press and hold one of the C buttons and press R. This brings up 16 zeros at the bottom of the screen. Use the inputs below to alter the players.
Head Scale: Bottom C+R at the options screen.
Body Scale: Left C+R at options screen.
Y Scale:Top C+R at options screen.

To get ads at any Options screen, press "Z" for an advertisement that will scroll across the bottom of the screen.

At the options screen, hold L and press C-Right, C-Left, C-Left, C-Right, C-Left, C-Left, C-Right, C-Left, C-Left. If you did this right , a "1" should appear on the tenth spot from the left. This will give you extra teams: Williams (I think it is the best), Canada, USA, and the 99ERS.

During the face-off before actual gameplay, pause and go to Replay. Make a player flash by pressing the L or R buttons, each time you press another player will be highlighted. While a player is flashing press the "Z" button. He will disappear, and if you want you can make all of the players disappear.

This is cool if you just want to fight all the time, because, in fact, you'll be fighting every second with this code on. Good to surprise a friend, maybe. During a game, go to the Options menu and highlight fighting. Then hold L (left) and press these C buttons in this order: RLLRBTTBLRRLRL. R=right, L=left, B=bottom, T=top. If you've entered it correctly, a string of zeroes will appear on the bottom of the screen.