I use this fun quiz as an ice breaker the first couple days of school. There are clues that students must use to name NFL football teams.
NFL challenge rules: What can a coach challenge (and not)?
17-0 NFL team: 1234 challenge! #acshear #nfl #nflfilter #1playerperspi, NFL
Bears: NFL fans love Matt Nagy's challenge flag spike in front of ref
NFL Challenge - Wikipedia
How many challenges are allowed in the NFL? Explaining the rules for reviewing a call by referees
NFL challenge rules: What can a coach challenge (and not)?
Screenshot of NFL Challenge (DOS, 1985) - MobyGames
EA Calls All Madden NFL Players to Tackle the EA SPORTS Madden NFL Live Challenge
Preseason trial and error - How NFL coaches will test pass interference review - ESPN
383 Nfl Coach Challenge Flag Stock Photos, High-Res Pictures, and Images - Getty Images
NFL Challenge Box Shot for PC - GameFAQs
The best and worst of the NFL coach's challenge
NFL Gridiron Trivia Challenge, Board Game