Playbooks

Levels Out from Shotgun Trey Y-Flex is a classic Cover 2 beater built around a two-level in-cut concept on the trips side paired with a boundary out and a deep corner/wheel breakout on the backside. From trips, the inside receiver runs a shallow drag while the middle receiver sits on an intermediate in-route, creating the levels stack that attacks zone drops underneath. The backside receiver releases outside then works vertically up the sideline off the flex alignment, giving you a home run shot if the safety bites on the levels concept. Primary progression starts with the shallow drag, moves to the levels in-route, and works to the backside vertical if the linebackers and safety collapse on the underneath routes.
Read the middle linebacker depth at the snap: if he sits shallow to jump the drag, throw the levels in-route behind him for an easy completion. Key the safety over the trips side, since Cover 2 and Cover 4 shells leave a natural window for the levels concept between the corner and safety zones. Watch for a user-controlled defender lurking in the shallow drag lane, which is the most common way good competition users take away this concept, so be ready to move to the levels in-route or backside vertical. Check the backside corner leverage pre-snap: if he plays outside shade with no safety help, the vertical route can win over the top on a double move or simple footrace. Beware of Cover 3 sky or man blitz packages that bring extra pressure off the edge, since the levels concept needs time to develop and a fast four or five man rush can force an early, inaccurate throw.
Use this on second and medium to second and long when you expect Cover 2 or Cover 4 shells since the levels concept naturally sits in the honey hole between the underneath zone and the deep safety.
Pre-snap, check the safety alignment: if both safeties are deep and the corners are playing off, the levels in-route will have room to sit down in the window before the linebacker can drop underneath.
Hot route the backside outside receiver into a deeper comeback or fade against man coverage if you see a corner playing tight press, since the levels concept alone struggles versus man unless you have a hot read built in.
Pair this play with Levels Y Corner or Inside Post Out in the same set to keep the defense guessing between underneath in-cuts and deeper breaking routes off similar initial releases.
Against a Cover 3 shell, prioritize the shallow drag and the levels in-route since the middle of the field will be occupied by only one deep defender, and the backside vertical can hold the corner if he tries to help over the top.