At the main menu select "My WWE" "Options" then "Cheat Codes". Enter one of the following codes to unlock the corresponding bonus:
Tribute To The Troops arena
Enter "8thannualtribute" as a code to unlock the Tribute To The Troops arena.
Cruiserweight Hardcore and Million Dollar Championship belts
Enter "historicalbelts" as a code to unlock the Cruiserweight Hardcore and Million Dollar Championship title belts. -From: Kenny Williams and wwefan85
John Cena Street Fight gear
Enter "slurpee" as a code to unlock the John Cena Street Fight gear. -From: mudknot69666
Randy Orton alternate attire
Enter "apexpredator" as a code to unlock the Randy Orton alternate attire.
Play Road To WrestleMania with Christian. Talk to Edge in the south locker room at the Elimination Chamber PPV about the Time Machine. Then go to the GM Office and talk to Vince McMahon. You will find out the Time Machine is broken into three pieces (they will appear as three green dots on the map). Look for the Edge and Christian action figures. They are between the bookshelf and the TV. Once you leave you will get a phone call from Edge. The "Flux Capacitor" (Back To The Future reference) is in the Green Room. The "Phone Booth" (Bill & Ted's Excellent Adventure reference) is in the parking lot. Go to Edge with all three parts to get the Time Machine which allows any Superstar to travel to any point in time on the Road To WrestleMania.
Having a title match anytime in WWE Universe
Once all bonus championship belts are unlocked give any vacant title to a title holder in the WWE Universe. Then create any type of singles match and select the double title holder. When you select him both titles should be on the line (for example give Dolph Ziggler the Intercontinental and ECW belts). This allows every custom match to be a championship match; every superstar can have a title match even WWE Legends. Note: This trick works with all WWE Universe belts except the Divas and Womens belts. -From: Justin Witherspoon
Unlocking wrestlers in WWE Universe