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Double Stacks


A retro-gaming experience with a modern twist awaits on the slot from NetEnt. Double Stacks is a journey back in time to the era of classic fruit machines with an added symbol mechanic that takes it into the 21st century. Wild substitutions, a double stacks feature and a free spins round with stacked wild symbols can lead to wins of up to 1,000 times your bet on a single spin.

Slot Details

Double Stacks is a video slot with five reels, three rows and 10 fixed paylines. Wins are awarded for three to 10 matching symbols on a line from left to right only. Available on desktop and mobile, you can bet from 0.10 to 200 credits per spin. The game has medium volatility with an RTP of 96.10%.

The visuals remind us of classic fruit machines with typical symbols dominating on the reels. A game window with vibrant colours and a generic soundtrack are the first impressions awaits when loading the game. Crisp graphics and smooth animations add to the feel of high quality we have seen coming from the Swedish studios of NetEnt. Four displays towering above the game grid show the maximum win for each of the top symbols.

The low-value symbols appear as single symbols only and are in ascending order melons, lemons, plums and cherries, awarding 2x your bet for a single five of a kind. This can increase up to a 9OAK in combination with four double wilds, at which point the payouts increase to 6x your stake.  All four premiums – bells, bars, blazing 7s and diamonds can land in double stacks. Hitting five on a line will yield 2x to 4.5x your bet while a 10OAK ranges from 10x to 100x your stake.

A golden star marked with the word itself is the wild symbol, substituting for all regular pay symbols while a round icon also marked with the word itself acts as the scatter.

Double Stacks Slot Features

As the name indicates, the Double Stacks mechanic is at the core of the gameplay. In the base game, only the four premiums can appear stacked while in Free Spins the wild symbol can also land stacked. Hitting a full stack on a reel will double the symbols from three to six. One symbol will count as two symbols with only one more needed on a pay line on reel two to score a three of a kind. Having five double symbols on a pay line will award a win for a 10-of-a-kind.

Three, four or five scatters anywhere on the reels in one spin will trigger 5, 15 and 30 free spins. During the feature, two to five scatters will retrigger an additional 2 to 30 free spins. There is no multiplier in free spins but the wild symbol will appear now stacked as well and will double if it covers an entire reel. A full screen of double diamonds, double wilds or a combination of both will pay the maximum win in a single spin, coming in at the respectable 1,000 times your stake.

Final Verdict

Undoubtedly, Double Stacks looks good with all the flashing lights and elaborate animations but the core is just too average to make it stand out from the crowd. Hitting a full screen with double symbols is highly unlikely and getting the same with single symbols pays a mere 45x bet for the diamonds. Not something hardcore nerds will chase but overall the game is good for recreational slotting as the volatility will ensure in most cases long gaming sessions even with smaller balances.

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