There are 4 extra special features in the Silverback Gold slot. One of them comes randomly in the base game, while the other are in the bonus round.
A random feature that can be triggered on any spin. It adds 6-20 Silverback symbols on the reels, increasing your chances to hit a big win.
Three or more scatters can trigger the bonus round which serves as a gateway to the free spins round. All scatter positions are locked for the duration of the bonus. You only get 3 spins to start with, with golden tokens the only symbol that can land on the reels.
These have a random value attached to them and will reset the number of spins to 3. The feature goes on until you run out of free spins or you fill all the positions. A token value of 300 will do the same.
As soon as the bonus game finishes, the free spins feature will start. Three, four, or five scatters deliver 10, 15, or 20 free games. Every scatter that lands on the reels during the bonus round will add extra spins to your tally.
Remember the tokens you collected in the bonus round? Their value comes into play now. These are collected in a special meter, and tokens can now appear on Silverback symbols. As you reach certain levels on the meter, the corresponding symbol upgrades to a Silverback symbol. For example, 30 tokens upgrade the gator, while the maximum of 300 upgrades Silverback symbols to their gold version that pays more.
The wild sunset symbol that lands on the reels in free spins can come with 2x or 3x multipliers.