QuarterBack Club Football

Codes you can enter at the legal screen
NFC/AFC Teams - ABABAB
Fumble Mode - CABCAB
No Fumble Mode - BABABA
Play doesn't end if someone's on the ground - B, A, Start, Start, Start, Start
All jumps like the jump near the goaling - CA ,Start ,Start ,AB
Sucky Team Mode - Start, A, Down, A, Start, Start
Slippery Mode - AAAAAA Acclaim/Iguana Teams - Down, A, Down, A Night Game - Start, A, Down, Start, A, Down

More QuarterBack Club Teams
Rapidly press start at the first credit screen and don't stop untill the "Iguana" logo appears at which point you want to hold down start untill "Put up or shut up" appears. Release start then press it again. Then select "Pre Season" and scroll through the teams until you see the "Acclaim" or "Iguana" teams.