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NFL Blitz
No Fumbles, Infinite Turbos, and More:
From the main menu screen, choose Exhibition Mode and then pick your team. At the "Matchup" screen, press the following buttons for the code results as shown.

No Fumbles:
START, START, START, START, B, B, A, A, A, Down.

Infinite Turbos:
START, START, START, START, START, B, A, A, A, A, Up.

Night Game:
START, START, B, B, A, A, Right.

No Pointer:
START, START, START, B, B, B, A, A, A, Left.

Invisible Receiver:
START, START, START, START, B, B, B, A, A, A, Up.