Return to Player
96.1%
Minimum bet size
0.10
Game category
Video Slots
Volatility
High
Reels
5
Progressive jackpot
No
Popularity
Maximum bet size
200
Game Provider
NetEnt
Bonus features
Yes
Paylines
10
Theme
Classic
Double Stacks Online Slot Game
Double Stacks gives a retro-inspired spin to fruit, 7s, diamonds, bells and bars, with modern 3D reels. Double stack symbols can form larger combinations, free spins add further payout opportunities, and the wild can help complete winning lines.
Theme and Storyline
This game calls back to the classic days of slot machines featuring fruit, 7s, bars, diamonds and stars. Disco-style lights brighten the backdrop, but Double Stacks has no specific storyline. Instead, it offers simple entertainment and a lively set of features.
Graphics, sounds and animations
Double Stacks plays at a brisk pace, with crisp, colorful graphics. Light animations accompany symbols bursting from the reels during bigger wins. Lighting is a highlight: the reels glow as they slow, and symbols flash when a payline combination lands. A relaxed, funky soundtrack plays in the background, with voice effects for a mega win and electronic sounds for regular wins.
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How the gameplay works
Al Buraq Regina presents Double Stacks, with Evan Carrington describing its bright 5-reel gameplay, 10 paylines, stacked wilds and double-symbol feature. Symbols may double on any reel with each spin, so 2 symbols count for the price of 1.
Diamond, red 7, bar, and bell symbols form combinations of 3 to 10. Cherry, plum, lemon, and watermelon pay in combinations of 3 to 9. For example, a 7-cherry combination across reels 1-2-3-4 can include double symbols on reels 2-3-4 (6 symbols), with one symbol (1 symbol) on reel 1 completing the 7-symbol combination.
The Diamond has the highest payout. Landing 5 double symbols across reels 1-2-3-4-5 awards 1,000x times the ‘Level Bet’ in coins. The ‘Coin Value’ determines the cash amount and is set in cash. Double-win Diamonds in all 15 reel positions can pay up to 15,000x times the ‘Level Bet’.
The wild cannot double, but is stacked across the reels. As a single symbol, it substitutes for any symbol except the scatter.
Bonuses and free spins
Double stack symbols: Symbols may land doubled on the reels at any time. In effect, 1 symbol counts as 2, creating winning combinations from 1 to 10 symbols and from 1 to 9 symbols.
Scatter free spins: Landing 3, 4 or 5 scatters awards 5, 15 or 30 free spins, respectively. The 4 highest-paying symbols and the wilds appear stacked during the feature.
Retrigger free spins: During free spins, landing 2, 3, 4 or 5 scatter symbols anywhere in view awards another 2, 5, 15 or 30 free spins, respectively.
Stacked symbols: The 4 top-paying symbols—diamond, 7, bar and bell—can stack on the reels, potentially covering all 15 positions.
Bet sizes, RTP and volatility
Select ‘Max Bet’ to set the ‘Bet Level’ to 10. Each bet level adds 10 coins per spin, so ‘Level 10’ means 100 coins per spin. Set ‘Coin Value’ to 2.00 for the maximum cash bet of 200.00. For the minimum cash bet, set ‘Coin Value’ to 0.01 and ‘Bet Level’ to 1; each spin then costs 0.10, with 10 coins in play.
The review classifies Double Stacks as a high-volatility slot. Wins may occur fairly often, but many smaller returns only cover about the spin bet. It highlights free spins as an important consideration alongside the stated 96.1% RTP. RTP is a theoretical long-term figure, not a promise for any session.
Conclusion
New players may find Double Stacks’ fast pace and simple format approachable, while fans of classic slots may enjoy its traditional design. Stacked symbols, free spins and other features give NetEnt’s game a modern take on familiar fruit-slot conventions. Al Buraq Regina presents these features as entertainment, not a guarantee of wins or future popularity.
Evan Carrington brings more than 12 years of experience in the iGaming industry, specializing in online casino reviews, slot game analysis, and player safety assessments. Their expertise includes casino licensing, RTP, volatility, bonus terms, and withdrawal policies. Combining hands-on reviews with independent research, Evan provides clear, evidence-based coverage to help players understand gambling platforms, their features, and possible risks.
