Sometimes the right call is staying behind security. That can still be a good layover if you give yourself a small plan.
Play something light
Pick browser games that load quickly, do not demand sound, and work in short rounds. Save battery by dimming the screen and avoiding heavy video when outlets are scarce.
Make the airport the game
Try a gate-side bingo list: matching suitcases, delayed flight announcements, a local food sign, someone sprinting, a therapy dog, or a gate change.
Reset your body
Walk, refill water, stretch, find a calmer gate, and give your next flight a better version of you than the one that arrived.