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You can also ask your question on our NFL GameDay 99 Questions & Answers page.
Unlock Bonus Teams:
At the 'Team selection' screen press Circle to access various Superbowl and All-Star teams.
Unlock Onside Kick:
When the bar is at it's lowest press X to do a short kick that will bounce back while the returning team is not ready.
Unlockables
At the 'Options' screen choose the 'Easter Eggs' selection and enter the following codes to unlock the corresponding effect.
Harder Tackles: BIG HITS
Receivers Catch Better: STICKEM
Longer Field Goals: STEEL LEG
Bad Coverage: WEAK
Bullet Passes: HOT SHOT
Infinite Stamina: STAMINA
Better Running Backs: DAVIS
More teams when you are picking your teams press O and you will get an
allstar team and a superbowl team to get both press O two times