To enable cheats, at the main menu hold L+R and then press B, B, B, A, Y, B, X, A
Use the following user names to unlock the corresponding effect:
Classic: get NFL Legends Team
KaySlay: get team Kay Slay
Travel: unlock all stadiums
Excellent: get Team Xecutioner
nw9378: get NFC West
as76884: get NFC West, AFC South
aw9306: get All Star teams
ae3278: AFC East All Star Team
an6789: AFC North All Star Team
as6884 AFC South All Star Team
aw9378: AFC West All Star Team
ne3278: NFC East All Star Team
nn6789: NFC North All Star Team
ns9378: NFC South All Star Team
nw9378: NFC West All Star Team