Fumble-less mode:  Enter GlueHands as a code. In quick game mode, fumbles will happen 0% of the time on hits or tackles. This can not be enabled with fumble mode.

AFC West All-Stars:  Enter WAEFSCT as a code to unlock the AFC West All-Star Team at the team selection screen.
AFC East All-Stars:  Enter EAASFSCT as a code to unlock the AFC East All-Star Team at the team selection screen.
AFC North All-Stars:  Enter NAOFRCTH as a code to unlock the AFC North All-Star Team at the team selection screen.
AFC South All-Stars:  Enter SAOFUCTH as a code to unlock the AFC South All-Star Team at the team selection screen.

NFC West All-Stars:  Enter ENASFSCT as a code to unlock the NFC West All-Star Team at the team selection screen.
NFC East All-Stars:  Enter NNOFRCTH as a code to unlock the NFC East All-Star Team at the team selection screen.
NFC South All-Stars:  Enter SNOFUCTH as a code to unlock the NFC South All-Star Team at the team selection screen.

EA Field:  Enter EAField as a code.

Team Reebok:  Enter Reebok at as a code.
Team Xzibit:  Successfully complete the tutorials.

Extra points:  Have a saved game from Madden NFL 2005 or the original NFL Street on your memory card for extra money for you and the team in Own The City.

To get extra points, have a saved game from an EA game such as Need For Speed Underground 2 or SSX 3. You will get 25,000 points for each.

Unlock Legends and Gridiron Park
Hit every hot spot in every level to in quick game to unlock the legends.
Beat the NFL Legends in Own the City mode to unlock them.
Beat the NFL Gauntlet to unlock Gridiron Park.

Go to the cheats screen under options and press X to bring up the area to enter them.

Password Effect

FirstFirst 10 yard first downs
llxGBCraZ 2x GameBreaker
Trick3dOut All chains mode
Magnet Hands All players will have maxed out Catching stat.
GreasedPig Always Fumble
RuinedPicnic Ants Mode
Team Xzibit Beat the Tutorials
BIGPig Big Sized Football
EAField EA field
XxGBCraZ Gamebreaker x10
BIGSmash Huge Players
NozBoost Infinite Turbo
MagnetHands Max Catch
GottaBDShoes Max Speed
BlastTackle Max Tackle
GlueHands No Fumbles(quick game mode only)
NoChains No more first downs
BloominGroup No Textures
SighsMatters Random Size Players
Shrunken Small Players
CementShoes Weak O-Moves and Jumping

hit the hotspots on each field. Once you unlock all the legends you unlock the legends team.

Unlockables

Anthony Munoz hit a hotspot in "The Cage"
Bo Jackson hit a hotspot in "Sportsplex"
Chris Carter hit a hotspot in "The Alley"
Darrell Green hit a hotspot in "The Backlot"
Jack Lambert hit a hotspot in "Royal Park"
Joey Browner hit a hotspot in "The Dig
Mean Joe Greene hit a hotspot in "The Tracks"
Mike Singletary hit a hotspot in "Second St. Station"
Randell Cunningham hit a hotspot in "Imperial Tower"
Sterling Sharpe hit a hotspot in "The Aqueduct"

Unlock Gridiron Park

Gridiron Park Beat NFL Gauntlet