Silverback Gold

Silverback Gold by Netent is a video slot set deep in the jungle, where gorillas, snakes, crocodiles, leopards, and birds inhabit a wild and lush environment. It is played on a 5-reel, 4-row grid, offering 1,024 ways to win from left to right. The main feature of the game is the Bonus Game, which is triggered by landing three or more Scatter symbols anywhere on the reels. During the Bonus Game, the positions of the scatters are locked, three spins are awarded, and only tokens appear in the unblocked positions; each token becomes a random value and resets the spin counter to three. The Bonus Game ends when the spins run out, the grid is filled, or enough token value is accumulated. At the conclusion of the Bonus Game, Free Spins are activated, and additional Free Spins are awarded for each Scatter that appears subsequently. During Free Spins, Wild symbols can turn into 2× or 3× Multiplier Wilds, and multiple Multiplier Wilds in a win combine multiplicatively. There is also a random Silverback Attack feature, which in the base game and during Free Spins adds between 6 and 20 Silverback symbols to the reels. As tokens are collected during the game, a collection meter fills up; upon reaching certain thresholds, lower-paying symbols are upgraded to Silverback symbols, and if the highest level is reached, Silverback symbols turn into Golden Silverback symbols during Free Spins for maximum payout potential. The game includes a Buy Bonus option in jurisdictions where it is allowed, costing 100× the bet to activate Free Spins directly through a guaranteed spin.

You can play it for real money.