You can spend Gold to purchase Premium Crates or Bucks. 

Gold can be awarded when leveling up, earning Achievements, making in-app purchases, completing Tapjoy 'Free Gold!' offers, or watching 'Free Gold!" videos.

The Tapjoy 'Free Gold!' offers and 'Free Gold!' video features can be found by:

1) Taping the "+" or Gold icon on the top right of the screen.

2) Under the Gold menu, tap the Tapjoy "Free Gold" or Watch Video for "Free Gold".

3) Watch a full video or complete offers to earn free Gold!

All the Best,

Hothead Games