Can't Find the Cheat Code Menu ?
[Submitted by: Toebin ]
The cheat code menu is found under the options menu, but only in the US versions of the game. The European version does not have a cheat menu.

Unlockable Shop Goods

Bret Hart	$210,000********
Hardcore Championship	$20,000***
HBK DX Entrance	$30,000*
HBK DX Outfit	$60,000
HHH DX Entrance	$30,000*
HHH DX Outfit	$60,000
JBL	$110,000
Mick Folley	$210,000******
Million Dollar Championship	$20,000***
Move Set 1	$15,000
Move Set 2	$15,000
Move Set 3	$15,000
Preset Move Set	$15,000**
Rick Rude	$210,000
Roddy Piper	$210,000
Sabu	$210,000
Shane McMahon	$60,000
Stone Cold	$210,000*****
Terry Funk	$210,000*******
The Rock	$210,000****
Vince McMahon	$110,000*********
Vince McMahon (Bald)	$60,000**********
WCW Classic Championship	$20,000***
WWF Attitude Era Championship	$20,000***

* - DX Outfits must first be purchased.
** - All Move Sets must first be purchased.
*** - You must be a Hall of Famer.
**** - Character must first be defeated with Stone Cold.
***** - Character must first be defeated with Bret Hart.
****** - Character must first be defeated with Undertaker.
******* - You must first win a 4-way match fighting Sandman, Sabu, and Tommy Dreamer.
******** - Character must first be defeated by Shawn Michaels.
********* - Complete 24/7 GM Mode and become GM of the Year.
********** - The original Vince McMahon must first be purchased.

DX Costumes
How to unlock: Insert "DXCostume69K2" at the in-game cheats menu.

Money $$$ Money
Description: Here's an easy way to make lots of money fairly fast.
How to: Start a new game on 24/7 Mode with a created wrestler. He doesn't even have to be any good. On the Calendar, scroll down to Wrestlemania PPV and select it. Choose to simulate each and every match to this date. It will take a while, but at the end of simulation, you will have made hundreds of thousands of dollars. You can use this to buy new, better character and other stuff, plus you can repeat this process as many times as you want.

Arenas
How to unlock: get the specified amount of points in Hall of Fame mode.

5 Points - No Way Out

6 Points - Vengeance

7 Points - ECW One Night Stand

8 Points - December to Dismember

9 Points - New Year's Revolution

10 Points - Summerslam

12 Points - Wrestlemania 23

Kelly Kelly's Alternate Outfit
How to unlock: Insert "KellyKG12R" at the in-game cheats menu.