Bonus Features
The Donuts slot comes has 2 bonus features. Donut Boxes will open to award up to 4 donut symbols (for up to 2,401 ways to win) or Jukebox Wilds with multipliers up to 4x. In the Free Spins feature, you first play the Bonus Countdown which sees you build the multiplier up to 50x which is used on free spins winnings. You can also winning unlimited extra free spins.
Donut Boxes

In the base game, look out for Donut Box symbols appearing. When they do, the Donut Boxes feature will be activated. Basically, the donut boxes open to reveal up to 4 Donut symbols or a Jukebox Wild with a multiplier between 2x and 4x.
With up to 4 Donut symbols appearing, the number of ways to win can increase up to 2,401. Jukebox Multiplier Wilds up to 4x will apply when part of a winning combination.
Free Spins

The Free Spins feature is triggered by landing 3 or 4 Gold Donut Scatter symbols anywhere on the reels. With 12 or 20 free spins awarded respectively, a Bonus Countdown begins with 3 respins.
The Bonus Countdown is played on a new set of reels with only blank symbols and Gold Donuts. Each triggering scatter awards a 1x multiplier.
Each Gold Donut that lands will increase the Free Spins Multiplier up to 50x. When you land no new Gold Donuts and the number of respins reaches zero, the Free Spins feature commences.
The free spins begin with the multiplier accrued in the previous Bonus feature. If 2, 3 or 4 Gold Donut Scatter symbols land, you will retrigger the feature with 10, 20 or 30 extra free spins, respectively. There is no limit to the number of additional free spins you can win.