Return to Player
96.1%
Minimum bet
0.10
Game category
Video Slots
Volatility
High
Reels
5
Progressive jackpot
No
Popularity
Maximum bet
200
Game Provider
NetEnt
Bonus features
Yes
Paylines
10
Theme
Classic
Double Stacks Online Slot Game
Double Stacks is a retro-inspired slot that brings fruit, 7s, diamonds, bells and bars to modern 3D reels. Double stack symbols can create bigger combinations, free spins offer more payout opportunities, and the wild regularly helps complete winning lines.
Theme and Storyline
This game brings back the classic era of slot machines featuring fruit, 7s, bars, diamonds and stars. Disco-style lights brighten the background, but Double Stacks doesn’t tell a specific story. Instead, it offers a simple setting focused on fun and a lively selection of features.
Graphics, sound and animations
Double Stacks plays at a brisk pace and features crisp, colourful graphics. Light animations accompany symbols as they burst from the reels during bigger wins. The lighting is a particular highlight: the reels glow as they slow, and symbols flash when a payline combination appears. A relaxed, funky soundtrack plays throughout, with voice effects for a mega win and electronic sounds for regular wins.
Top Casinos to Play Double Stacks:
How the gameplay works
Casino Ideal presents Double Stacks, with Evan Carrington highlighting its bright 5-reel gameplay, 10 paylines, stacked wilds and double-symbol feature. On any spin, symbols may double on any reel, so 2 symbols can count for the price of 1.
Diamond, red 7, bar and bell symbols can form combinations of 3 to 10. Cherry, plum, lemon and watermelon symbols pay in combinations of 3 to 9. For example, a 7-symbol cherry combination across reels 1-2-3-4 could use double symbols on reels 2-3-4 (6 symbols) and a single symbol on reel 1 (1 symbol) to make 7.
The diamond pays the most. Landing 5 double symbols across reels 1-2-3-4-5 pays 1,000x the ‘Level Bet’ in coins. The cash value depends on the ‘Coin Value’, set in cash. If double-win diamonds fill all 15 reel positions, the payout can reach 15,000x the ‘Level Bet’.
The wild can’t double, but it is stacked throughout the reels. As a single symbol, it can substitute for any other symbol except the scatter.
Bonuses and free spins
Double stack symbols: Symbols can land in doubled form on the reels at any time. In this case, 1 symbol counts as 2, creating winning combinations of 1 to 10 and 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 a further 2, 5, 15 or 30 free spins, respectively.
Stacked symbols: The 4 highest-paying symbols—diamond, 7, bar and bell—can stack on the reels and may fill all 15 reel positions.
Bet sizes, RTP and variance
Select ‘Max Bet’ to set the ‘Bet Level’ to 10. Each bet level adds 10 coins to a spin, so ‘Level 10’ means 100 coins per spin. Set ‘Coin Value’ to 2.00 for a 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 played.
The review characterizes Double Stacks as a high-variance slot. Wins may come reasonably often, but many smaller returns only cover about the cost of a spin. It points to free spins as an important part of the stated 96.1% RTP; RTP is a theoretical long-run figure, not a promise for any individual session.
Conclusion
New players may find Double Stacks approachable thanks to its fast pace and straightforward format, while fans of classic slots may enjoy its traditional design. Stacked symbols, free spins and other features give this NetEnt game a modern spin on familiar fruit-slot conventions. Casino Ideal presents these features as entertainment, not as a guarantee of wins or future popularity.
Evan Carrington brings more than 12 years of experience in the iGaming industry, with a focus on reviewing online casinos, assessing slot games and examining player safety. Their work covers casino licensing, RTP, volatility, bonus terms and withdrawal policies. Drawing on practical testing and independent research, Evan provides clear, evidence-based reviews to help players understand gambling platforms, their features and possible risks.
