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29 October 2024 
Double Stacks Slot is a slot from NetEnt gaming that goes from the basic “Fruit” machine concept by increasing the volatility using a feature of Doubling. Its character is of an 80’s neon theme with bright graphics and sound.
Slot Mechanics/Features
The slot has two parts a doubling feature and a free spins bonus. The double stacks feature (doubling) occurs when any symbol covers the whole reel. It then splits into a double symbol. Any of these doubled symbols can increase the pay-out value of the line.
A win is classed between 3 to 10 of the same symbols. The four highest 10 symbol pay-out are on the Bell (x100), Bar (x250), Red Severn (x500) and Diamonds (x1000).
Free Spins are triggered on 3,4 or 5 Scatters giving 5, 15 or 30 Free Spins. The only change from the base game is that Wilds can now appear stacked also as well as the 4 highest symbols being stacked during these.
Extra Free Spins can be won when 2,3,4 or 5 scatters land during the bonus giving 2, 5, 15 or 30 extra spins to the existing spins.
What to look for
This a simple slot design that increases volatility by only having 10 lines and a doubling feature. Therefore, it isn’t a straightforward low volatile slot but would range from low to mid volatility. The concept is simply getting a full screen and it pays. As nice as it is to have simple slots this it doesn’t really offer much.
The free spins are all about getting retriggers to keep getting chance to line things up and with the stacked wilds it makes it easier to do in the bonus. Therefore, the bonus is the more likely place to hit a full screen than in the base game.
Final Thoughts
There is always a market for new simple games without complicated features and triggers. However, this concept has been done and it really offers not much new to this design. Although this is a major negative it is still well done, the graphics are good and fluid as well as the music.
The volatility will attract some people with a possible x1000 max spin, but we feel this will be lost in all the new casino slots coming out with better concepts and newer mechanics to offer more entertainment. Overall, it’s a solid attempt just not very imaginative.
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