To be able to unlock the Big Catch slot machine, just follow the instructions below;
1. Login your Facebook account in a browser, we prefer you using your desktop browser in this method.
2. Open and "Like" the official Slots Reel Frontier page or by going to this link: https://www.facebook.com/SlotsReelFrontier.
3. After liking, go to this page: https://www.facebook.com/SlotsReelFrontier/app_174961479209942.
4. You will be able to see the page shown below. Just hit the Generate button to get your free Redemption/Voucher Code.
5. Open Slots Reel Frontier app then redeem your code, enjoy the newly unlocked Big Catch slot machine.
If you want to know or need a guide on how to use your generated code, please read the article Here.