To unlock hidden teams, enter these names when creating new user names (note: these are case-sensitive):
NFC North Allstars: NN6789
NFC East Allstars: NE3278
NFC South Allstars: NS9378
NFC West Allstars: NW9378
AFC North Allstars: AN6789
AFC East Allstars: AE3278
AFC South Allstars: AS6884
AFC West Allstars: AW9378
NFL Legends Team: Classic
KaySlay Team: KaySlay
Xecutioner Team: Excellent