Double Stacks


Double Stacks Slot Review

Double Stacks is a classic slot from NetEnt with 5 reels and 10 paylines. You’ll be able to play Double Stacks at Vera&John, Dunder or Cashmio.

Theme and game basics

With Double Stacks we get another classic slot in bright colours, some neon elements, a synthesized background sound and interesting features. The slot is fast and good looking, considering that all the elements are indeed classic. We get Diamonds, Lucky 7s, Bar symbols, Bells, Cherries, Plums, Lemons and Melons.

If you get classic 5-of-a-kind wins in this slot, you’ll get 45x your stake for Diamonds, 40x your stake for Lucky 7s and 30x for the Bar symbols. However, the main feature means you can get much more than that, which we’ll get to in the next paragraph.
The Star is the wild symbol in this game. And a silver circle is the scatter.

Gameplay and features

The main feature in this game is the ability for all high value symbols to appear stacked on the reels and then double their value, when they do. The symbols will actually split, when that happens, giving you a better indication of what to expect. Two double stacks on the first two reels, or even a single and a double stack, will yield winning combinations as you’ll get three of a kind on three rows.
The maximum payouts for the symbols when you get five double stacks of them are found above the reels. Thus, the Diamonds come with a massive win of 1,000x your stake, Lucky 7s bring you 500x your stake, the Bar symbols offer up 250x your stake and the Bells still reel in 100x your stake. We’ve never caught a full screen of double stacks, but we have scored 99x our bet in the base game thanks to a combination of double stacks, regular matching symbols and wilds. That’s pretty decent.

What’s more, the slot also comes with a free spins feature. You’ll need 3, 4 or 5 scatters to trigger 5, 15 or even 30 free spins. During the feature, wild may show up as double stacks as well, making it easier to get some decent wins.

Also, additional scatters will give you additional free spins.

2 scatters: plus 2 free spins
3 scatters: plus 5 free spins
4 scatters: plus 15 free spins
5 scatters: plus 30 free spins


The theoretical RTP (Return to Player) of Double Stacks is 96.1%. Having played a thousand rounds on the slot, we can confirm this is a realistic value, even if it’s not great, it’s sufficient. Our main wins came from some big and mega wins during the base game, thanks to those double stacks. On average we managed to score between 15x and 45x our stake, sometimes even more. So, that’s good news.

The bad news is that it took us forever to see the free spins even once. On our first try, we didn’t get them after playing 400 rounds. On the second try it took us over 500 spins to finally get 5 free spins. And only thanks to one bigger win and two additional free spins, did we manage to win about 42x our stake. Perhaps it was just a cold day for us, or we were simply unlucky. But waiting around for such a long time hardly seems worthwhile. The winning potential is there, absolutely. But you’ll better be ready for the wait and some clever budgeting.


Mobile Free spins
Yes Yes
Lines Bonusround
10 No
Reels Progressive
5 Yes
RTP Wild symbols
96.10% Yes
Min. Stake Autoplay
0.10 Yes
Max. Stake Multiplier
200 No
Volatility / Hit Frequency Scatters
Medium No
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