In the main game, landing 3 Bonus symbols anywhere on the reels triggers the Fight Spins feature.
Forget paylines at that point - it's just your bird vs theirs, straight up., it's all about your rooster going head-to-head with another fighter.
String together 6 wins and boom - final boss time.
In this last stage, the Secret Symbol appears. It is the highest-paying symbol in the game and only shows up in this final battle.
If your Hero defeats the Boss in the 7th fight, you unlock the Bonus Game, where you receive a random cash prize.
Each win means bigger rewards, so even when you're getting your butt kicked, it's worth sticking it out.