Many various passwords
At the main menu select Features. Next, select "Gretzky Challenge" and unlockables. At the unlockables screen. press start to bring up the password entry menu. Enter any of the following passwords to unlock the specified effect.

PASSWORD [ BOLD ] Effect [ NON BOLD ]
SAPL TATH CUKP Unlock perfect slap shots
TADHRE TEH EDNELE Unlock perfect aim mode
OBOR SKHECC Unlock RoboEnforcer Model-44
EFDTAFEACIN Unlock no skater fatigue
LAL ABRAOD Unlock big boards checking
ARGLE NI RAGECH Unlock bigger players
IGHTMY UOSEM Unlock smaller players
VINIOS FO LYRGO Unlock Stanley Cup Championship video
NNIADOUAMFM Unlock all alternate uniforms
DLEONG ARE Unlock all vintage uniforms
TEH ESATGRTE NOES Unlock all Wayne Gretzkys
CULKY NETC Earn one Gretzky point

Unlocks everything
Press start in the unlock screen

Password: CONHEOSL