Santa’s Stack Slot Review
Relax Gaming have built a solid reputation for crafting compelling cluster pays slots that balance mechanical depth with engaging themes. Santa’s Stack, released in November 2021, demonstrates this competency perfectly. The game combines a Christmas theme with distinctive 8-bit pixel art aesthetics—a nostalgic visual approach that sets it apart from the realistic festive slots saturating the market. What makes Santa’s Stack genuinely distinctive is how it embraces high volatility without apology. This isn’t a game chasing casual players or those seeking consistent base game action. Instead, it’s built for players who understand the volatility trade-off and actively pursue it.
Base Game & Features
Santa’s Stack operates on an 8×8 grid using cluster pays mechanics, where winning clusters form when at least 5 identical symbols connect adjacently (horizontally or vertically). When clusters hit, they trigger a cascade feature where symbols fall and new symbols drop down to create additional wins on the same spin. This mechanic alone creates the potential for meaningful cascading sequences, particularly when combined with the game’s re-spin features.
The symbol paytable is straightforward: Santa pays 10,000x, Mrs Claus 4,000x, Elf 3,000x, Rudolph 2,000x, and Baubles (Christmas Lights by colour) range from 125x (red) down to 75x (blue). Wild symbols substitute for all regular symbols except scatters, providing the essential win-completion function expected in cluster games.
Secret Santa Re-Spin Feature
The Secret Santa Re-Spin is the mechanical centrepiece of Santa’s Stack base game. When a wild symbol participates in a winning cluster, all winning symbols transform into mystery symbols and you receive an automatic re-spin. These mystery symbols lock in place, and if new wins form adjacent to them during the re-spin, those additional clusters also convert to mystery symbols, triggering further re-spins. This cascading mechanic continues until no new wins form adjacent to the mystery symbols. At that point, all locked mystery symbols reveal the same symbol type simultaneously, potentially generating substantial payouts.
The re-spin feature creates meaningful cascade potential, though community testing confirms that mystery symbols can be difficult to trigger consistently. This isn’t a weakness so much as a mechanical reality: the feature rewards patient players willing to weather extended dry spells between significant clusters forming.
Free Spins & Bonus Features
Free spins trigger when you land three or more Christmas Tree scatter symbols on the reels. You’ll receive a minimum of 5 free spins, with an additional spin awarded for each extra scatter landed. The real mechanical appeal emerges during the bonus round: Relax Gaming guarantee at least one wild symbol per spin, and crucially, the number of guaranteed wilds increases by +1 with each successive spin. This escalating wild mechanic builds genuine tension across the bonus round, as your later spins benefit from progressively stacked wild potential.
During free spins, the Secret Santa Re-Spin feature remains active, meaning additional win sequences and re-spins can occur. The game also includes scatter modifiers: landing a Blue Scatter during bonus awards an extra free spin, whilst a Red Scatter increases the win multiplier by one level. This combination of escalating wilds, active cascade mechanics, and multiplier potential creates the opportunity for genuinely substantial payouts—the 20,000x maximum win is achievable and mechanically supported.
Bonus Buy Feature
Santa’s Stack includes a Bonus Buy feature costing 100x your stake, which immediately triggers the free spins round with a guaranteed wild placement from the first spin. The feature increases RTP from 96.27% (base game) to 97.00%—a modest improvement of approximately 0.73 percentage points. However, professional testing revealed that despite the modest RTP boost, repeated bonus buy attempts led to bankroll depletion, suggesting the feature’s actual value proposition is weaker than the RTP increase suggests. Bankroll management experts recommend only attempting bonus buys with a stake reserve of 5-10x the feature cost.
Important note: The Bonus Buy feature is not available to UK players due to UKGC regulations prohibiting bonus purchase mechanics. This is a regulatory requirement rather than a casino choice.
Our Honest Verdict
Rating: 7.8/10
Santa’s Stack succeeds because it understands what makes cluster pays compelling. The 8×8 grid and Secret Santa re-spin create genuine cascade potential, whilst the escalating wild count during free spins builds pacing tension that keeps bonus rounds engaging. The pixel art aesthetic is genuinely distinctive in a market dominated by realistic festive slots, providing visual originality without sacrificing mechanical depth.
However, the game’s defining characteristic is also its most significant limitation: the 5/5 volatility rating is brutally enforced. With a 23.97% hit frequency, wins occur roughly every 4-5 spins, and most will be very small payouts. The high volatility rating isn’t a soft 5 out of 5—it’s a genuinely harsh difficulty setting. Between winning clusters forming, Santa’s Stack plays like a patience test rather than an entertainment experience.
This game polarises players clearly. For those who understand and actively pursue high volatility gameplay—players willing to weather extended dry spells for explosive bonus moments—Santa’s Stack fits the bill perfectly. The mechanical execution is professional, the features reward patience with genuine payout potential, and the visual distinctiveness provides thematic appeal. For casual players, low-volatility seekers, or those with limited bankrolls, this game isn’t appropriate. It demands careful bankroll management, realistic expectations about base game drought periods, and genuine enjoyment of the volatility experience.
Santa’s Stack ranks among the best Christmas slots released, particularly for volatile-game enthusiasts. Just approach it with caution and respect the brutality of its design.
Frequently Asked Questions
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What is the RTP of Santa’s Stack slot?
Santa’s Stack has an RTP of 96.27% in regular play mode. When using the Bonus Buy feature (available in certain jurisdictions outside the UK), the RTP increases to 97%. The Bonus Buy is not available to UK players due to UKGC regulations prohibiting bonus purchase mechanics. -
What is the maximum win in Santa’s Stack?
The maximum win available in Santa’s Stack is 20,000x your stake. This top prize is achievable during the free spins bonus round thanks to the combination of escalating wilds, cascade mechanics, and multiplier symbols that accumulate throughout the bonus. -
How volatile is Santa’s Stack slot?
Santa’s Stack is a highly volatile slot game with a volatility rating of 5 out of 5 on Relax Gaming’s own volatility scale. This means wins are substantially less frequent but can be much larger when they do occur. The hit frequency is 23.97%, indicating that wins come around roughly every 4-5 spins, with most being small payouts. This is a genuinely harsh volatility setting, not overstated. -
What are the main features in Santa’s Stack?
Santa’s Stack includes several key features: Wild Symbol (substitutes for regular symbols except scatters), Secret Santa Re-Spin (where winning clusters with wilds turn into mystery symbols for re-spins), Free Spins (minimum 5, with guaranteed wilds increasing by +1 per spin), and Bonus Buy (which costs 100x your stake and increases RTP to 97%, not available in UK). The game also features scatter modifiers—Blue Scatters award extra free spins, Red Scatters increase multipliers. -
How do you trigger free spins in Santa’s Stack?
You trigger free spins in Santa’s Stack by collecting three or more Christmas Tree scatter symbols on the reels. You’ll receive a minimum of 5 free spins, plus one additional spin for each extra scatter symbol landed. During free spins, the Secret Santa Re-Spin feature remains active with guaranteed wilds landing each spin, with the number of guaranteed wilds increasing by one per spin. -
What is the Secret Santa Re-Spin feature in Santa’s Stack?
The Secret Santa Re-Spin is activated when a wild symbol is part of a winning cluster. All winning symbols turn into mystery symbols and you receive a re-spin. These mystery symbols stay on the reels, and if new wins form adjacent to them, those also convert to mystery symbols, triggering additional re-spins. When no more adjacent wins are created, all mystery symbols reveal the same symbol type. This mechanic can lead to significant cascading wins. -
What is the game layout and mechanics of Santa’s Stack?
Santa’s Stack is played on an 8×8 grid layout using cluster pay mechanics. Winning clusters form when at least 5 identical symbols sit adjacently to one another (horizontally or vertically). When clusters hit, they trigger a cascade feature where symbols fall and new symbols drop down to create additional wins on the same spin. This creates the potential for meaningful cascading sequences, particularly when combined with the re-spin features. -
What is the visual style and theme of Santa’s Stack?
Santa’s Stack features a Christmas theme with an 8-bit pixelated aesthetic. The game uses blocky, retro-looking graphics with a cosy snow-covered setting filled with Christmas trees and festive symbols. This nostalgic visual approach creates an idyllic winter holiday atmosphere while maintaining modern gameplay mechanics. The pixel art style is distinctively original compared to most modern festive slots that use realistic imagery.
