Cheats during gameplay are as follows:

MANTIS - Makes the players bigger and stupid looking
NHLKIDS - Makes the players smaller and stupid looking
HOMEGOAL - Scores a goal for the home team
AWAYGOAL - Scores a goal for the away team
PENALTY - Causes a 5 minute major + a game misconduct to be called
INJURY   - Duh, just be sure you hit them first.
ZAMBO - Brings the Zamboni on the ice during the game
VICTORY - Starts fireworks below the scoreboard
FLASH - Camera flashes from the crowd
SPOTS - Turns on the pregame spot lights in the crowd
CHECK - Killer code enables you to flatten a player by skating into him
GRAB - Enables grabbing each time you hit someone, like check.

Internet Play:
Click the X in the bottom left to quit, but then type ultimatejudge (case doesn't matter, but no spaces). You should hear a strange
noise. Then go to Connection and select Internet. You need to know your opponents IP address....

Create a character named Mike Smith. He'll be maxed out in everything.

Other Cheats:
At the main screen type
eaeao for the EA Blades superteam.
stanley and see the end of season video.

Eric Cranage, Jason Beaugrand and Chris Short