Chick-fil-A is rewarding its surging popularity with an offer of free food to its customers over the next three weeks. Here's how to join in on the fun.

Georgia-based chain Chick-fil-A is kicking off summer with the return of its popular digital game, Code Moo, offering customers across Georgia and the U.S. the chance to win free food. The fast-food chain bringing back fan-favorite characters Sarge, Daisy, and Carrots, three mischievous cows who lead players on weekly spy-themed challenges.