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Double Stacks review

Return to player
Game technology
Game provider
Configurable winlines
Progressive Jackpot
Gamble feature

Quick verdict

Double the stacks, double the fun? Not so much in this very average fruit machine style slot machine with a twist.

Guru Score

Theme and Storyline

Double Stacks has a retro one-armed bandit feel. The typical fruit machine symbols are all here, Diamonds, Bars, Sevens, Bells and so on.

However, where many slot machines that adopt this theme do so to evoke a kind of old style one winline simplicity, Double Stacks comes with a bunch of gameplay twists and bonuses (see below for details).

For a game that has taken this well-worn theme for its design, it doesn’t do much to stand out.

Graphics, Sounds and Animations

The Symbols are pretty bland, if competently designed, and don’t do much to draw the player in. But the jazzy background they are contrasted against is pretty stylish and the animations are done with great flare and a have a nice 3D shine on them.

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Double Stacks is a ten winline slot machine played on a five-by-three grid.

The key twist on gameplay is the Double Stack of the game’s title, wherein the four highest paying symbols appear stacked in the main game. This allows you to make large combination wins by landing multiple stacks of the same symbol. The highest payout is for filling the entire screen with the diamond symbol.

The double stack is triggered when you fill a reel with one symbol, that symbol then changes to a double stack symbol and counts as two symbols for the purpose of calculating winnings.

The maximum payouts for these wins is written across the top of the screen.

Wilds, Bonuses and Free Spins

The Wild symbol (the star with Wild written on it) plays as any symbol except for the Scatter symbol.

If you hit three or more Scatter symbols the Free Spin bonus is triggered. If you hit three Scatters you get five free spins,or four Scatters you get fifteen and five Scatters grant you thirty spins.

You can Retrigger spins by hitting two or more Scatters with two Scatters earning you two extra respins.

During Free Spins the Wilds can also appear in stacks.

Bet Sizes, RTP and Variance

The return to player is 96.10%. This is neither good nor bad, but more or less what we expect from the industry.

The site we tested allowed a rand of bets per spin that ranged from £/$/€0.10 up to £/$/€200.00. That is a good spread that will please most bankroll sizes.

Double Stacks has its volatility rated as medium by various online sources. We prefer high volatility games as they fit with our preferred strategies.


Double Stacks is a old style fruit machine stacked with a twist.

Whether or not the double stacks are enough to make Double Stacks stand out is doubtful, but what really puts paid to any hope of a recommendation is the bog standard return to player and medium volatility neither of which is high enough to really tempt us into playing.

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