Finally understand what's happening on the field. Gridiron 101 teaches American football the way coaches do: on a live field you can tap and play, one short lesson at a time.

Every lesson is a guided walkthrough. You get a quick overview, a few hands-on tasks right on the field, a short quiz and a recap. Tap any player to see his position and his job, then run the play and watch it unfold.

START WITH THE BASICS (FREE)
• The field, downs, scoring and penalties
• All 22 positions, plus a deep dive on each one: quarterback, running backs, receivers, tight end, offensive line, defensive line, linebackers, cornerbacks and safeties
• Formations and personnel, defensive coverages, and game situations like 4th down and two-point tries
• Daily review: a few minutes a day brings back what you've learned just before you'd forget it, with a streak to keep you coming back
• A searchable glossary of 129 football terms

GO DEEPER WITH PREMIUM
• Advanced lessons: the route tree, line play and gap fits, pass protection, quarterback reads, option reads, special teams, motion and shifts, and clock rules
• The film room: why play concepts beat coverages, pattern-matching zone rules, run-blocking schemes, NFL vs. college vs. high school rules, offensive systems, and fourth-down math
• Coverage detective: watch a play and name the coverage. Spot disguises, build streaks and chase a high score
• Play designer: pick a formation, set motion, draw your own routes and test them against any coverage
• Call sheet: build a game plan like a coordinator
• Cheat sheets and a knowledge review drawn from the lessons you've finished

LEARN BY DOING
• Run any pass concept against any coverage and see who gets open, and why
• Make the quarterback's read: find the key defender, then throw
• See how the defense reacts to motion and what that tells you
• Rules are labeled by level where the NFL, college and high school differ

BUILT FOR YOUR PHONE
• Open any field full screen, then pinch to zoom
• Progress, XP and levels from Novice to Guru
• No account needed. Your progress stays on your device.

ONE PRICE, NO SUBSCRIPTION
The basics, positions and strategy lessons are free. Premium unlocks everything else with a one-time purchase. Pay once and keep it, including on a new phone with the same Google account.

Whether you're a new fan, a parent learning the game alongside your kids, a fantasy player who wants to understand the film, or a player studying the playbook, Gridiron 101 gets you there.