Box as Mills Lane

Go to options menu, select Cyber Athelete. Watch the video and then go to the exibition mode and get disqualified. Mills Lane will be under middle weight.
Submitted by B374499

Max Attributes

Create a boxer with, PSIRULES and get maxed attributes 
Submitted by Derek & Terri micallef

Throbbing heads!

Enter THROB as your created boxer's name, and the boxers in the next fight will have throbbing heads.
Submitted by Anonymous

Small Boxers

Enter MINIME as your created boxer's name, and the boxers in the next fight will be smaller.
Submitted by Anonymous

One Illegal hit...

To give your opponent an illegal groin kick, push X TRI CIR SQU.
Submitted by Anonymous

Killer Boxer.....

In career mode when it asks you to type the boxer's name enter in PSIRULES.After this save the boxer and exit career mode. Then come back to career mode and load the boxer.HE WILL HAVE ALL HIS STATS MAXED OUT ALL 100'S HE'S 7'9 250 POUNDS AND THE GREATEST BOXER IN THE WORLD IF YOU KNOW HOW TO USE HIM..... Tip:make him a slugger.
Submitted by Jones

Deduct your points!?

To add a little excitement to the match you can kick your opponent!!!How? simply press the square,triangle,circle,and x button at the same time. You will be deducted one point! Try it!!!!!!!
Submitted by Kevin C.

Box as a gargoyle 
Enter "GARGOYLE" as a name at the boxer creation screen in career mode to unlock a gargoyle. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.
Submitted by LBal683738

Box as a clown 
Enter "SHMACKO" as a name at the boxer creation screen in career mode to unlock a clown. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.
Submitted by LBal683738

Box as O 
Enter "O" as a name as a name at the boxer creation screen in career mode to unlock the musician that performed most of the game music. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.
Submitted by LBal683738

Box as Q-Tip 
Enter "Q_TIP" as a name at the boxer creation screen in career mode to unlock Q-Tip from the band "A Tribe Called Quest". Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space.
Submitted by LBal683738

Box as Tim Duncan 
Enter "TIM_DUNCAN" as a name at the boxer creation screen in career mode to unlock Tim Duncan from the San Antonio Spurs. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space
Submitted by LBal683738

Box Marlon Wayans 
Enter "MARLON_WAYANS" as a name at the boxer creation screen in career mode to unlock Marlon Wayans, the comedian. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space.
Submitted by LBal683738

Box as Marc Ecko 
Enter "MARC_ECKO" as a name at the boxer creation screen in career mode to unlock Marc Ecko, the founder of the Ecko line of clothes. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space.
Submitted by LBal683738

Box as Jermiane Dupri 
Enter "JERMAINE_DUPRI" as a name at the boxer creation screen in career mode to unlock Jermiane Dupri, the hip-hop musician. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space.
Submitted by LBal683738

Box as Ed Mahone 
Enter "ED_MAHONE" as a name at the boxer creation screen in career mode to unlock Ed Mahone. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes. Note: "_" indicates a space.
Submitted by LBal683738

Box as an alien 
Enter "ROSWELL" as a name at the boxer creation screen in career mode to unlock an alien. Press Circle at the pre-fight ranking screen to save the boxer for use in career and exhibition modes.