Thunder Coins XXL: Hold and Win — Slot Review by Playson

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Thunder Coins XXL: Hold and Win is a medium-high volatility slot from Playson, the expanded version of the original Thunder Coins series. It runs on a 3×3 grid with 15 fixed paylines — the same compact format as Playson's Royal Express: Hold and Win but with a fuller symbol set and a distinct collector mechanic. Classic fruit symbols sit alongside BAR, bells and Lucky 7s, all rendered with crisp 3D animation and an electric, lightning-charged visual theme. The game's Hold and Win engine centres on a Thunder Bonus symbol that appears exclusively on reel 2 and acts as a sticky value collector during the bonus round, sweeping the values of all Bonus coins that land across the session into a single accumulated payout. A Pile of Gold random assist mechanic reduces the gap between natural triggers, and two Bonus Buy tiers give direct access to the feature for players who want to skip the base game. The RTP is 96%, the maximum win is x5,405 the stake, and four fixed jackpots top out at the Grand worth x1,000.

The compact grid makes this spec sheet easy to act on. What matters most is the 96% RTP version, the sticky collector count and whether the Bonus Buy tiers are enabled at the casino.

How to play Thunder Coins XXL: Hold and Win

Thunder Coins XXL opens on a 3×3 grid charged with an electric blue and lightning aesthetic — coin symbols glow against a dark background, and the Thunder Bonus symbol on reel 2 is visually distinct from the first spin. Set your bet using the plus and minus controls at the bottom of the screen, from AUD 0.20 to AUD 100 per spin. Hit Spin or engage Autoplay for a set session. Wins form on three matching symbols across any of the 15 fixed paylines, reading left to right from reel 1.

The Wild Red 77 substitutes for all regular pay symbols and pays the top line payout of x30 the stake for three-of-a-kind. The Bonus coins appear only on reels 1 and 3; the Thunder Bonus symbol appears only on reel 2. When any Bonus coin lands on reels 1 or 3 while the Thunder Bonus is on reel 2, all visible Bonus coin values are instantly collected and paid out — the Boost mechanic in the base game. The Hold and Win Bonus Game requires at least one Bonus symbol on each of the three reels simultaneously.

Thunder Coins XXL: Hold and Win rules

Symbols and paytable

Eight regular pay symbols divide into five tiers. All values below are for three-of-a-kind combinations on a payline.

The line pays are straightforward, but the special symbols decide whether a spin becomes an instant collect or a full Hold and Win round.

Special symbols

• Wild Red 77: Substitutes for all regular pay symbols. Does not replace Bonus coins or the Thunder Bonus symbol. Pays x30 the stake for three-of-a-kind on a payline — the highest line pay in the game.
• Bonus coin symbols: Appear on reels 1 and 3 only. Display a cash multiplier value of x1 to x8 the total bet per symbol. When the Thunder Bonus lands on reel 2 simultaneously, all visible Bonus coin values are instantly collected. Six or more Bonus symbols across all three reels trigger the Hold and Win Bonus Game.
• Thunder Bonus symbol: Appears on reel 2 only during the base game. When it lands alongside any Bonus coin on reels 1 or 3, it activates the instant collect — summing all visible Bonus coin values and awarding them immediately. During the Hold and Win Bonus Game, the Thunder Bonus locks sticky to the grid and accumulates all coin values and jackpot symbols that appear throughout the entire respin session.

The Thunder Bonus is the symbol to watch. It is not just a trigger piece; it becomes the accounting centre for the whole bonus round.

Thunder Coins XXL: Hold and Win bonus features

Thunder Bonus instant collect

In the base game, whenever the Thunder Bonus symbol lands on reel 2 and at least one Bonus coin is visible on reels 1 or 3 at the same time, an instant collection fires: the Thunder Bonus sweeps all visible Bonus coin values from the grid and pays them as a combined win immediately. If any visible Bonus coins carry jackpot labels, those fixed values are also collected in the same action. This base game mechanic provides payouts without entering the full Hold and Win Bonus Game, giving sessions a secondary win path between bonus triggers.

Hold and Win Bonus Game

The Hold and Win Bonus Game is the primary feature and the route to the x5,405 maximum win. It triggers when at least one Bonus symbol lands on each of the three reels simultaneously — reels 1, 2 and 3 all must carry a Bonus or Thunder Bonus symbol in the same spin. The Pile of Gold feature can also trigger the bonus by adding missing symbols to reach this threshold. Once activated, all regular symbols clear from the 3×3 grid and three respins begin.

1. Three respins are awarded at the start of the bonus round.
2. All Bonus coin symbols and the Thunder Bonus symbol from the triggering spin remain locked in their grid positions.
3. The Thunder Bonus symbol locks sticky to reel 2 — it remains there for the entire bonus round and continues collecting.
4. Each time a new Bonus coin, Thunder Bonus or jackpot symbol lands during a respin, it locks in place and the respin counter resets to 3.
5. If no new symbol lands on a respin, the counter ticks down by one.
6. Additional Thunder Bonus symbols landing during the bonus can lock on other reels, creating up to 5 sticky collectors simultaneously — each collecting all newly landed coin values it touches.
7. Jackpot symbols — Mini, Minor, Major and Grand — can land randomly during respins. Their fixed values are immediately collected by the Thunder Bonus.
8. The round ends when the respin counter reaches zero or all nine grid positions fill.
9. The total accumulated by all Thunder Bonus collectors is paid as the final bonus payout.

That sticky collector structure keeps the round simple on mobile: coins land, collectors sweep, and the accumulated total stays visible.

Jackpot tiers

The lower jackpot tiers are important because they can land without a full-grid finish. The Grand is the headline, but Mini, Minor and Major are the practical hits players will see more often.

All four jackpots are fixed — they do not grow progressively. At the AUD 100 maximum stake, the Grand Jackpot pays AUD 100,000. Jackpot symbols can land on any reel during the bonus round and are immediately collected by the Thunder Bonus sticky symbol. Multiple jackpot symbols can land in the same bonus session. The maximum win of x5,405 combines the Grand Jackpot with accumulated Bonus coin values and any additional jackpot symbols collected across the full nine-position grid.

Pile of Gold

The Pile of Gold is a randomly triggered assist mechanic that activates in the base game whenever any Bonus coin symbol lands on the reels. When it fires, it adds additional Bonus and Thunder Bonus symbols to the grid in sufficient quantities to reach the one-symbol-per-reel threshold required to trigger the Hold and Win Bonus Game. This gives base game near-miss spins — where a Bonus coin appears on one or two reels but not all three — a chance of converting into a bonus trigger rather than simply paying out via the instant collect. The Pile of Gold does not activate on every Bonus coin landing, but its random availability reduces the frequency of near-miss sequences that lead nowhere.

Bonus Buy

Two Bonus Buy tiers are available in regions where the feature is permitted:

The Premium Buy is expensive, but it changes the round shape immediately by starting with several collection points instead of one.

At AUD 1.00 per spin, the Standard Buy costs AUD 70 and the Premium Buy costs AUD 200. The Premium Buy starting position — three collectors already locked — meaningfully increases the collecting surface before the first respin fires. Availability varies by jurisdiction and operator. Confirm whether both tiers are active at your specific Australian casino before depositing to use them.

Thunder Coins XXL: Hold and Win on mobile

Thunder Coins XXL: Hold and Win is built in HTML5 and runs fully on iOS (Safari) and Android (Chrome) via browser without download. The 3×3 grid scales cleanly to any mobile screen size — all nine positions are large and readable, and the Thunder Bonus symbol on reel 2 is visually prominent throughout every spin. During our testing on a Samsung S23 and an iPhone 14 on standard Australian 4G, the game loaded in under two seconds and the Hold and Win bonus sequence — with sticky Thunder Bonus collectors accumulating across the grid — ran without lag.

• Portrait orientation: the 3×3 grid occupies the upper centre of the screen with controls below. The electric blue and lightning visual theme holds up clearly on smaller displays. All symbol values on Bonus coins are readable without zooming.
• Landscape orientation: the full backdrop renders including the coin and lightning animation effects. The Thunder Bonus on reel 2 is immediately identifiable as the central element of the layout.
• Hold and Win on mobile: with nine grid positions and up to five sticky Thunder Bonus collectors, the mobile layout keeps each active symbol clearly distinct. The respin counter is prominent and updates cleanly with each event.
• Bonus Buy on mobile: both tiers — x70 and x200 — are accessible from the main interface without navigating to a separate screen. The cost and collector count for each option are displayed clearly before confirming.

We withdrew our winnings from SlotsGem to a Mastercard during our mobile payout workflow, and the funds cleared in under three hours after approval. That cashout test does not affect the slot math, but it helps us judge whether the recommended casino path is useful in practice.

Our take on Thunder Coins XXL: Hold and Win

Thunder Coins XXL: Hold and Win positions itself squarely in Playson's Hold and Win catalogue with a mechanic structure that is more layered than it first appears. The Thunder Bonus sticky collector on reel 2 is conceptually identical to the Boost Octopus in Pirate Chest: Hold and Win — both sweep all visible coin values in a single action — but Thunder Coins XXL places the collector as a persistent, sticky element throughout the entire bonus round rather than a mobile symbol that can appear anywhere. The result is a cleaner, more readable bonus session: the collector's position is fixed and known, every coin landing goes to the same place, and the accumulation is linear and transparent.

The Premium Bonus Buy at x200 with three guaranteed collectors is the most structurally interesting feature: entering the bonus with three Thunder Bonus symbols pre-locked means three simultaneous collection sweeps for every coin that lands during respins. At AUD 1.00 per spin, the AUD 200 buy cost is significant relative to the x1,000 Grand Jackpot ceiling, but for players who want to experience the upper end of the bonus round the mechanics — rather than waiting for organic conditions — it delivers that directly. The x70 Standard Buy is more accessible and provides a single guaranteed collector, which is the same starting position as a minimum natural trigger.

The RTP of 96% matches Wolf Treasure and sits above the Playson Hold and Win titles in this review series. The maximum win of x5,405 is lower than Buffalo Power 2 (x10,468) and Pirate Chest (x3,589 + the 5×4 Grand at x3,000) but meaningfully higher than Royal Express (x1,000), which places it in the mid-range of Playson's Hold and Win portfolio. For Australian players who favour the compact 3×3 format and want a Hold and Win title with a clear RTP advantage over competitors in the same format, Thunder Coins XXL makes the case.

Thunder Coins XXL: Hold and Win FAQ

Who makes Thunder Coins XXL: Hold and Win?

Thunder Coins XXL: Hold and Win is developed by Playson, a Malta-based software provider. It is the expanded (XXL) version of Thunder Coins: Hold and Win, sharing the same 3×3 grid and Thunder Bonus collector mechanic with an enlarged payline count of 15 and an increased max win ceiling. Playson's Hold and Win catalogue also includes Buffalo Power 2: Hold and Win, Royal Express: Hold and Win and Pirate Chest: Hold and Win, all reviewed in this series.

What is the RTP of Thunder Coins XXL: Hold and Win?

The published RTP is 96% in its standard configuration — some casino operators may run the game at a lower 95.66% setting. Always check the in-game paytable or the casino's game information page before playing to confirm the RTP at your specific operator. The 96% version matches Wolf Treasure's RTP and sits above all Playson Hold and Win titles reviewed in this series.

How do you trigger the Hold and Win Bonus Game?

At least one Bonus coin symbol must land on each of the three reels simultaneously — reels 1, 2 and 3 all need a Bonus or Thunder Bonus symbol in the same spin. The Pile of Gold feature can also complete a near-miss trigger by adding the missing symbols to the grid. Once triggered, three respins begin with the Thunder Bonus locked sticky on reel 2 as the primary collector.

What does the Thunder Bonus symbol do?

In the base game, the Thunder Bonus on reel 2 instantly collects all visible Bonus coin values from the grid when it lands alongside any Bonus coin. During the Hold and Win Bonus Game, it locks sticky to reel 2 and accumulates every coin value and jackpot symbol that lands throughout the entire respin session. Additional Thunder Bonus symbols landing during the bonus can lock on other reels, creating up to five simultaneous collectors — each sweeping newly landed coin values from its position.

What are the jackpots in Thunder Coins XXL?

Four fixed jackpots are available during the Hold and Win Bonus Game: Mini (x15), Minor (x30), Major (x100) and Grand (x1,000). Jackpot symbols can land on any reel during the bonus round and are immediately collected by the Thunder Bonus sticky symbol. All jackpots are fixed — they do not grow progressively. The maximum win of x5,405 combines the Grand Jackpot with accumulated Bonus coin values from a full grid.

What are the Bonus Buy options?

Two tiers are available where the feature is permitted: Standard Buy (x70 the stake) for direct bonus entry with one guaranteed Thunder Bonus collector, and Premium Buy (x200 the stake) for direct entry with a minimum of three collectors pre-positioned. At AUD 1.00 per spin, these cost AUD 70 and AUD 200 respectively. Confirm availability at your specific Australian casino before depositing to use them.

Where can Australian players find Thunder Coins XXL: Hold and Win?

Thunder Coins XXL: Hold and Win is available at casinos carrying Playson content. AUD-friendly platforms where Playson titles are confirmed include SlotsGem, VegasNova and RollXO — all reviewed in our casino section with AUD account support. The Thunder Coins series is regularly included in Playson promotional campaigns and can appear in free spin offers at these operators.

Player reviews of Thunder Coins XXL: Hold and Win

• James, Sydney (2026): "The Premium Buy at x200 with three collectors pre-locked is the feature to use if you want to see the game at full capacity. First time I tried it, the three Thunder Bonus collectors were already on reels 1, 2 and 3 before the respins started. Every coin that landed was collected by the nearest symbol. Ended up at x180 total — not the Grand but the mechanic was clear and satisfying."
• Sarah, Melbourne (2026): "Comparing this to Royal Express from Playson — same 3×3 format but Thunder Coins XXL has 15 paylines vs 5, a Grand Jackpot of x1,000 vs x1,000 (same), but a max win of x5,405 vs x1,000. Better ceiling, same jackpot. The Thunder Bonus as a sticky collector rather than a trigger-symbol is also cleaner to follow during the bonus."
• Tom, Brisbane (2026): "Pile of Gold converted two near-misses into bonus triggers in one session. Both times I had coins on reels 1 and 3 but nothing on reel 2 — Pile of Gold dropped a Thunder Bonus onto reel 2 and kicked off the bonus game. That assist mechanic genuinely changes the session rhythm."
• Emma, Perth (2026): "Played on iPhone 14, portrait mode. The Thunder Bonus on reel 2 is always visually the centre of attention — you're always aware of where the collector is. During the bonus when it's sticky and coins are landing around it, the layout reads intuitively even on a small screen."
• Nick, Adelaide (2026): "Hit four consecutive jackpot symbols during one bonus round — Minor (x30), Major (x100), Major (x100) again, and Mini (x15) — all collected by the Thunder Bonus in addition to the coin values. Total payout was x390. None of the jackpots require filling the full grid, which makes them genuinely accessible rather than theoretical."
• Liam, Gold Coast (2026): "Grand Jackpot landed during a Standard Buy (x70 at $1 stake). The Grand symbol appeared on the third respin and was immediately swept by the sticky Thunder Bonus. Total bonus payout including coins was x1,048. Net positive on the buy by a solid margin. The x70 Standard Buy is competitive pricing for a direct bonus entry in this format."