Best Microgaming Slots

Whether you’re hunting a life-changing progressive prize via Mega Moolah, chasing high-RTP spins on Immortal Romance, or simply want a well-rounded medium-volatility session, this guide covers the best Microgaming slots available right now, ranked by what actually matters to players: brand-confirmed RTP, volatility, bonus mechanics, and real-money win potential.

Best Microgaming Slots at a Glance

Microgaming has been shaping online slot gaming since 1994, building a slots software catalog of hundreds of titles that span every theme, volatility level, and jackpot size imaginable.  Every game on this page has been verified directly against the developer’s own published specifications.

Best Microgaming Slots List

1. Immortal Romance – Best for Highest RTP

• RTP: 96.86%
• Volatility: High
• Max Win: 12,150x
• Paylines: 243 Ways to Win
• Bet Range: $0.30 – $30.00
• Released: December 2011 (Stormcraft Studios for Microgaming, now distributed by Games Global)
• Progressive: No

Immortal Romance is the benchmark against which all Microgaming slots are measured. Released in December 2011 and remastered in HTML5 in 2020, it remains the studio’s most-played title and holds the highest confirmed RTP in this lineup at 96.86%, one of the best return rates across any major online slot provider’s back catalog.

The game is built on a dark vampire romance narrative, following four supernatural characters (Amber the witch, Troy the vampire, Michael the vampire, and Sarah the human) whose stories unfold through a layered Chamber of Spins bonus system. This is where Immortal Romance genuinely separates itself: rather than a single free spins mode, it delivers four distinct bonus rounds that progressively unlock as you trigger the Chamber more often.

The Wild Desire feature triggers randomly in the base game and can turn up to 5 reels completely wild in a single spin. Inside the Chamber of Spins, the four free spins modes unlock in sequence: Amber is available immediately and offers 10 free spins with a 5x multiplier; Troy unlocks after the 5th Chamber trigger and delivers 15 free spins with the Vampire Bats feature creating multipliers up to 6x; Michael unlocks after the 10th trigger with 20 free spins and Rolling Reels with multipliers up to 5x; and Sarah, the highest tier, unlocks after the 15th trigger and awards 25 free spins with the Wild Vine feature where vines randomly transform symbols into additional wilds. The 12,150x max win potential is achieved through Sarah’s Wild Vine combined with multiplier-stacked wilds. High volatility means the wins cluster rather than flow steadily, so patience and a solid bankroll plan are essential.

2. 9 Masks of Fire – Best for Medium Volatility and Casual Sessions

• RTP: 96.24%
• Volatility: Medium
• Max Win: 2,000x
• Paylines: 20 Fixed
• Hit Frequency: 39.75%
• Bet Range: $0.20 – $60.00
• Released: October 2019 (Gameburger Studios for Microgaming, now distributed by Games Global)
• Progressive: No

9 Masks of Fire was developed by Gameburger Studios in partnership with Microgaming and released in October 2019. It has since become one of the most consistently popular titles on the Games Global platform, earning its place here on the strength of a brand-confirmed 96.24% RTP and a medium volatility profile that suits players who want decent session length without the brutal variance swings of high-volatility titles.

The game runs on a 5×3 reel grid with 20 fixed paylines. The theme blends tribal African motifs with classic slot symbols including dollar signs, bells, bars and lucky sevens, giving it a distinctive look that manages to feel both retro and fresh. The Diamond is the wild symbol, substituting for all standard icons except scatters and masks to help form combinations across the reels.

The standout mechanic is the Mask Pays scatter system. When 3 or more golden mask symbols land anywhere on the reels, they pay out instantly according to a prize ladder displayed beside the reels with no payline alignment required. The reward scales from 1x stake for 3 masks up to 2,000x for the full 9 masks. The Free Spins bonus is activated by the shield-and-spears scatter symbol landing on reels 2, 3, and 4, triggering a fortune wheel spin that determines both the number of free games (between 10 and 30) and a multiplier of either 2x or 3x applied throughout the round. Free spins can be retriggered indefinitely. This combination of scatter prizes and a multiplier-boosted free spins round gives the game a hit rate of 39.75%, making it noticeably more forgiving than many of its stablemates.

3. Thunderstruck II – Best for Bonus Round Depth

• RTP: 96.65%
• Volatility: Medium
• Max Win: 8,000x
• Paylines: 243 Ways to Win
• Released: 2010 (Microgaming, classic franchise now developed by Stormcraft Studios)
• Progressive: No

Thunderstruck II is one of the most technically accomplished online slots ever produced. Built around Norse mythology with Thor, Odin, Loki, and the Valkyrie as the central premium symbols, it operates on the same 243-ways engine as Immortal Romance but adds a structured bonus progression that rewards long-term players in a way few slots match.

The Great Hall of Spins is the heart of the game. It offers four distinct free spins modes, each unlocked sequentially after a set number of cumulative bonus triggers. The Valkyrie feature is available from the first trigger and awards 10 free spins with a 5x multiplier (the only mode that can be retriggered for up to 20 free spins total). Loki unlocks from the 5th trigger with 15 free spins and the Wild Magic feature on reel 3 that transforms random symbols into additional wilds. Odin unlocks from the 10th trigger with 20 free spins and the Wild Raven feature where ravens turn random symbols into 2x or 3x multipliers (combinable up to 6x when both ravens land together). Thor unlocks from the 15th trigger with 25 free spins, Rolling Reels, and a multiplier trail rising from 1x to 5x with each consecutive cascade win.

The Wildstorm feature triggers randomly during base game spins and can turn up to all 5 reels completely wild for that spin. With a brand-confirmed RTP of 96.65%, an 8,000x max win, and this level of bonus architecture, Thunderstruck II genuinely earns its long-standing reputation. The franchise has since expanded to include Thunderstruck Wild Lightning, Thunderstruck Stormchaser, and the more recent Thunderstruck Gold Blitz Extreme, all developed by Stormcraft Studios.

4. Bust the Bank – Best for Free Spins and Wild Reels Combination

• RTP: 96.75%
• Volatility: Medium
• Max Win: 450x
• Paylines: 243 Ways to Win
• Bet Range: $0.30 – $300
• Released: 2013 (Microgaming, now distributed by Games Global)
• Progressive: No

Bust the Bank is a bank-heist themed 243-ways-to-win slot that punches well above its age. With a brand-confirmed RTP of 96.75%, it actually out-returns most newer releases including several games on this list. The crime-caper aesthetic delivers police dogs, dynamite clocks, security vans, and a bumbling pair of burglars, Bob and Larry, who appear at random times during the base game to award cash prizes.

Three bonus features give the game its staying power. The Safe Bonus activates when a safe symbol lands on reels 1 or 5, with the safe opening to award a coin value, and any additional safes below it duplicate the coin prize over every symbol they land on (up to 6 prizes possible from a single spin). The Piggy Bank Bonus triggers when the piggy bank symbol lands on reel 3, smashing open to award a Smashing Wild Coin Prize. The headline feature is the Free Spins round, triggered by 3 or more bomb scatters anywhere on the reels. Players receive 8 free spins, but critically, reels 1 and 5 turn completely wild and stay wild for the entire duration, dramatically increasing the probability of maximum-value combinations during that window. Each additional bomb scatter that lands during the round awards 1 extra free spin. The 450x max win cap reflects the game’s medium-volatility math model, but the wild-locked free spins mechanic and 96.75% RTP remain genuinely competitive for a 2013 release.

5. Unusual Suspects – Best for Max Win Potential

• RTP: 96.05%
• Volatility: Medium
• Max Win: 12,500x
• Layout: 5 reels, 4 rows, 20 paylines
• Hit Frequency: 35.27%
• Bet Range: $0.20 – $20
• Developer: Northern Lights Gaming for Microgaming/Games Global
• Progressive: No

Unusual Suspects is the dark horse of the Microgaming catalog, developed by Games Global partner Northern Lights Gaming. Its crime-lineup theme, featuring handcuffs, pistols, dynamite and briefcases full of cash, masks a 12,500x max win potential that is the highest non-progressive ceiling on this entire list. The 5×4 layout with 20 paylines is clean and accessible, and the brand-confirmed RTP sits at 96.05%.

Two wild types drive the base game. Silver Wilds substitute for paying symbols, while Golden Wilds spawn additional wilds or trigger another Golden Wild to repeat the effect. Whenever a Wild lands, it leaves a Sticky Frame behind on the reels with a 1x multiplier, and additional wilds landing on the same frame increase the multiplier by 1x up to a maximum of 5x. The Detective Wild is the bonus trigger: when he appears, he fills all accumulated Sticky Frames with wild symbols, with any multipliers carrying through to the win calculation.

The Free Spins feature triggers from scatter symbols and awards 10, 15, or 20 free spins for 3, 4, or 5 scatters respectively. During the round, every Detective symbol that lands progresses the Big Boss Bonus Trail above the reels: collecting 3 Detectives unlocks Big Boss 1 (+5 spins, x2 multiplier), 6 Detectives unlocks Big Boss 2 (+5 spins, x3 multiplier), 9 Detectives unlocks Big Boss 3 (+5 spins, x5 multiplier), and 12 Detectives unlocks Big Boss 4 (+5 spins, x10 multiplier). That escalating collector mechanic keeps every free spins session dynamic and gives patient players genuine upside toward the 12,500x ceiling.

6. Eggs Bonanza – Best High-Volatility Non-Jackpot Slot

• RTP: 96%
• Volatility: High
• Max Win: 15,000x
• Layout: 5 reels, 3 rows, 243 ways to win
• Hit Frequency: 27.89%
• Bet Range: $0.10 – $25
• Developer: Snowborn Games for Games Global
• Progressive: No

Eggs Bonanza is one of the more underrated Games Global releases of recent years, developed by Snowborn Games. Set on a sunny farm with 243 ways to win, it sits in the high-volatility tier but without the progressive jackpot tax that suppresses the base RTP on Mega Moolah titles. The 96% return rate here goes entirely to base game and bonus payouts.

The game’s most interesting base-game mechanic is the Eggs Collect feature. Egg symbols can land with values ranging from 1x to 200x the bet, and when a Collect symbol appears on reel 5 simultaneously, all visible egg values are paid out instantly. The Bonanza Booster meter beneath the reels collects tokens whenever 2 scatters land together, with the meter taking 16 tokens to fill. The more tokens collected when the bonus is triggered, the higher the starting value of collection symbols in the Bonanza Bonus. Chicky Respins is the second base-game feature, triggered by Golden Egg symbols landing on reels 1 and 5, with a multiplier that builds up to 5x as more Egg or 1UP symbols land.

The Bonanza Bonus is the headline round, activated by 3 bonus symbols on reels 1, 3, and 5. Three matching feature symbols inside the bonus trigger one of four mechanics: Doubler (multiplies all egg values by 2x), Spinner (awards extra spins), Expander (adds extra rows above and below the grid), and Prizer (awards a Prize Egg worth up to 1,000x bet). All except the Prizer can be retriggered twice; the Prizer can trigger up to four times. The combination of egg collection in the base game and four stacking modifiers in the bonus is what gives the 15,000x max win figure genuine plausibility.

7. Mega Moolah – Best Progressive Jackpot Slot

• RTP: 88.12% (base, excl. jackpot contribution)
• Volatility: High
• Layout: 5 reels, 3 rows, 25 fixed paylines
• Max Win: Unlimited (four-tier progressive)
• Released: November 2006 (Microgaming, now distributed by Games Global)
• Progressive: Yes (Mini, Minor, Major, Mega)

Mega Moolah is the slot that made Microgaming famous beyond the iGaming industry. Released in November 2006 and now operated within the Games Global progressive jackpot network, it holds a Guinness World Record for one of the largest online slot jackpot payouts, with a single win of €18,915,872.81 in September 2018 setting the previous record before being surpassed by sister-network jackpot WowPot at €38.4 million in December 2023.

The game runs on a safari theme with a Lion Wild symbol that doubles all wins it contributes to, and a Witch Doctor Scatter that triggers 15 free spins with all wins tripled when 3 or more land on the reels. The 5-reel, 3-row, 25-payline base game is intentionally simple, with the four-tier progressive jackpot (Mini, Minor, Major, and Mega) doing most of the lifting. The Jackpot Bonus Wheel can trigger at random on any spin regardless of stake size, though higher bets improve the probability. The Mega Jackpot seeds at $1 million and has paid out single wins deep into eight-figure territory across the network’s lifetime, with more than €140 million paid out through the broader Games Global progressive network in 2023 alone. The suppressed base RTP of 88.12% is the direct trade-off for that life-changing upside. If you are playing Mega Moolah for regular-session value, you will likely find Immortal Romance or Thunderstruck II more rewarding. If you’re looking for huge jackpot slots, no other Microgaming game comes close.

8. Mega Moolah: Absolootly Mad – Best Mega Moolah Variant

• RTP: 92.02%
• Volatility: Medium
• Layout: 5 reels, 3 rows, 243 ways to win
• Bet Range: $0.20 – $50
• Released: 2020 (Triple Edge Studios for Microgaming)
• Progressive: Yes (four-tier Mad Cuckoo Jackpot Wheel)

Based on Lewis Carroll’s Alice in Wonderland, Absolootly Mad is the most fully realised entry in the expanded Mega Moolah universe, developed by Microgaming partner Triple Edge Studios. Symbols include card suits, a pocket watch, tea cups, the March Hare, Cheshire Cat, and the Mad Hatter across 243 ways to win. The 92.02% RTP reflects its progressive jackpot architecture, with a portion of every wager seeding the jackpot pool.

The Rolling Reels feature fires on every winning spin: symbols in the winning combination dissolve, allowing new icons to cascade into place and extend the win sequence, with a Multiplier Trail rising from 1x up to a maximum of 5x in the base game. The Free Spins bonus launches on three Magical Wooden Door scatters and awards 8 free spins with the multiplier trail tripled, reaching up to 15x for four or more consecutive winning spins. The feature can retrigger up to a maximum of 56 free spins.

The progressive jackpot bonus is the main event. Every Wild symbol collected during base game play is added to the Golden Teapot meter above the reels, and when triggered, the action moves to the Mad Cuckoo Jackpot Wheel where the player wins one of the four progressive tiers (Mini at $10, Minor at $100, Major at $10,000, or Mega at $1,000,000 minimum seed). This is one of the few jackpot slots where the bonus-trigger mechanic actually builds visible excitement across the base game rather than firing randomly. The biggest single Absolootly Mad jackpot win to date is €19,430,723.60, paid out on 27 April 2021.

9. Lara Croft: Tomb Raider – Best Retro Classic

• RTP: 96.56%
• Volatility: Low
• Max Win: 7,500x
• Layout: 5 reels, 3 rows, 15 paylines
• Released: October 2004 (Microgaming)
• Progressive: No
• Best Feature: Free Spins with 3x multiplier and Tomb Bonus pick-and-click

The game that helped put Microgaming on the mainstream map, Lara Croft: Tomb Raider was one of the first licensed branded slots in online casino history. Released in October 2004 on a 5×3 grid with 15 paylines, its 96.56% RTP and low-volatility math model make it surprisingly forgiving for a vintage release.

The Free Spins feature triggers when 3 or more Lara Croft scatter symbols land on the reels, awarding 10 free spins with all wins subject to a 3x multiplier and the round retriggerable from additional scatters. The Tomb Bonus is a pick-and-click feature activated by 3, 4, or 5 Tomb Bonus symbols landing on an active payline, transporting the player to the Forgotten Temple where 12 statues hide instant cash prizes (the number of picks depending on how many bonus symbols triggered the feature). The Tomb Raider logo serves as the Wild and substitutes for all symbols except the scatter and bonus icons. For players who want a nostalgic slot without the complexity of modern multi-stage bonus architecture, it remains a valid choice. Availability varies by operator now that the title is over two decades old.

10. Jurassic Park – Best for Branded Slots Fans

• RTP: 96.67%
• Volatility: Medium-High
• Max Win: 6,333x
• Layout: 5 reels, 3 rows, 243 ways to win
• Bet Range: $0.30 – $15
• Released: 2014 (Microgaming, under licence from Universal Studios and Amblin)
• Progressive: No

Microgaming’s Jurassic Park adaptation brings Steven Spielberg’s 1993 film to the reels with impressive visual fidelity for its era and was the first slot to use parallax scrolling effects on the reel grid. Five dinosaur-themed Free Spins features are triggered by 3 or more Mosquito-in-Amber scatter symbols, with each delivering 12 free spins and its own unique mechanic.

The Tyrannosaurus Rex feature awards 12 free spins with Wild Reels, where the T-Rex can turn up to all five reels wild during the round. Velociraptor delivers 12 free spins with Split Wilds (which can split a wild symbol into two for potential 6-of-a-kind wins) and random Multiplier Wilds of 4x, 5x, or 6x. Triceratops offers 12 free spins with Running Wilds, where the wild stack grows by one symbol per reel each spin and partial stacks nudge to form full stacks on non-winning spins. Brachiosaurus features 12 free spins with Mystery Multipliers between 2x and 6x applied to each spin. Dilophosaurus awards 12 free spins where the dinosaur can turn random positions wild and hold them in place when they contribute to wins.

The base game also features the random T-Rex Alert Mode, triggered when the T-Rex appears at any random moment during paid spins. The mode lasts 6 spins, during which 35 extra wild symbols are added to the reels, dramatically increasing the chance of substantial payouts. With a brand-confirmed RTP of 96.67%, a max win of 6,333x stake, and one of the most elaborately constructed wild systems of any Microgaming-era release, Jurassic Park rewards players who land the dinosaur features at the right moment.

Microgaming Slots – Frequently Asked Questions