Thunder vs Underworld from Pragmatic Play

RTP: 96.5%

Clash with the gods and spin for divine treasures! Let Thunder vs Underworld electrify your journey.

Clash with the gods and spin for divine treasures with Pragmatic Play’s Thunder vs Underworld, an epic casino game that plunges players into a mythological battle between Zeus and Hades. Released in October 2024, this online slot offers a unique dual-mode system, allowing players to choose between the high volatility of Thunder (Zeus) or the even higher volatility of Underworld (Hades). With its exceptionally high RTP, thrilling gameplay, and powerful bonus features including expanding wilds with multipliers and sticky wilds in free spins, Thunder vs Underworld promises an electrifying adventure for players seeking monumental payouts up to 15,000x their stake.

Provider: Pragmatic Play
Release Date: 2024
RTP: 98.04% (Thunder Mode)
Volatility: High (Thunder Mode)
Max Win: 15,000x
Theme: Greek Mythology / Gods / Elemental Clash
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For players seeking a quick overview of the technical aspects, here’s a detailed table of Thunder vs Underworld’s core features:

Feature Value
Reels 5
Rows 5
Paylines 15 (fixed)
Min Bet 0.10
Max Bet 100
Max Win 15,000x
Jackpot No
RTP 98.04% (Thunder) / 98.00% (Underworld)
Volatility High (Thunder) / Very High (Underworld)
Hit Frequency N/A

Thunder vs Underworld thrusts players into an electrifying clash between the Greek gods Zeus and Hades. The online slot’s theme is a grand mythological battle, allowing players to choose their allegiance, which dynamically alters the game’s appearance. The Thunder mode (Zeus) is set against an ancient temple bathed in bright blue lightning, while the Underworld mode (Hades) features a darker setting with a fiery gateway, creating incredibly atmospheric environments for this casino game.

The graphics are crisp and highly detailed, with symbols that change to match the chosen profile. Stunning animations, particularly when expanding wilds cover reels or multipliers activate, add dynamic flair to the gameplay. The sound design features an epic orchestral soundtrack that perfectly complements the mythological narrative, building tension and excitement during gameplay, enhancing the overall immersive online slot experience.

  • Regular Symbols: The low-paying symbols are glossy card royals (10, J, Q, K, A). Higher-paying symbols include mythological artifacts like chalices, helmets, phoenixes (Thunder mode), Lernaean Hydras/Nemean Lions (Underworld mode), and the deities Zeus and Hades themselves. Zeus and Hades are typically the highest-paying regular symbols.
  • Special Symbols:
    • Wild Symbol (Olympus/Hades Badges): Special badges for Olympus and Hades act as the wild symbols. They substitute for non-special symbols and appear on all reels. If they can lead to a win, they expand to cover the entire reel.
    • Multiplier Wilds: Expanding wilds come with a random multiplier ranging from 2x to 100x. If multiple multiplier wilds are part of the same winning combination, their multipliers are cumulative, significantly boosting the potential payout.
    • Scatter Symbol: A distinct scatter symbol (often representing a portal or a clash of elements) triggers the free spins feature. Scatters land only on odd-numbered reels (1, 3, 5).

Playing Thunder vs Underworld offers an exhilarating and strategic experience, utilizing a 5-reel, 5-row setup with 15 fixed paylines. Wins are formed by landing three or more matching symbols on adjacent reels from left to right across a payline, starting from the leftmost reel. This high RTP slot ensures dynamic gameplay with every spin.

To begin your divine battle, you’ll first be prompted to pick either Thunder Mode (Zeus) or Underworld Mode (Hades), which sets the game’s volatility and RTP. Then, set your desired bet amount using the intuitive controls, with options typically ranging from a minimum of 0.10 to a maximum of 100 per spin. Once your wager is chosen, hit the spin button. An autoplay function is available. For practice or just for fun, Thunder vs Underworld can be enjoyed as a free slot machine in demo mode. This online slot is fully optimized as a mobile slot, ensuring a seamless and engaging experience across all iOS and Android devices, allowing you to clash with gods anywhere.

Thunder vs Underworld is packed with thrilling bonus features designed to enhance your gameplay and deliver significant payouts:

  • Dual Modes (Thunder vs Underworld): Choose between Thunder Mode (high volatility, 98.04% RTP) which increases the chance of triggering free spins but with generally lower payouts, or Underworld Mode (very high volatility, 98.00% RTP) which decreases free spins frequency but offers significantly higher potential rewards.
  • Expanding Wilds with Multipliers: Wild symbols (Olympus/Hades Badges) can appear on all reels. If a win is possible, they expand vertically to cover their entire reel and are assigned a random multiplier from 2x up to 100x. If multiple expanding wilds are part of the same winning combination, their multipliers are cumulative.
  • Free Spins with Sticky Wilds: Landing three Scatter symbols on reels 1, 3, and 5 triggers 10 free spins. During this round, any expanding wild that hits will extend, adopt a random multiplier, and crucially, remain sticky for the rest of the free spins, leading to potentially massive payouts. Free spins cannot be retriggered.
  • Bonus Buy: Players can instantly trigger free spins with four options:
    • Thunder Mode Standard Free Spins (75x bet)
    • Thunder Mode Special Free Spins (300x bet, guaranteed expanding wild with multiplier on first spin)
    • Underworld Mode Standard Free Spins (150x bet)
    • Underworld Mode Special Free Spins (300x bet, guaranteed expanding wild with multiplier on first spin)

For strategic casino game players, a clear understanding of these core statistics is invaluable.

  • RTP: Thunder vs Underworld boasts exceptionally high RTP slots, with Thunder Mode offering 98.04% and Underworld Mode offering 98.00%. These figures are well above the industry average for online slots, indicating very favorable long-term returns for players, making it a standout choice for value.
  • Volatility: This online slot offers selectable volatility. Thunder Mode has high volatility, meaning wins are less frequent but can be large. Underworld Mode has very high volatility, implying even rarer but potentially monumental payouts. This makes it ideal for players who enjoy high-risk, high-reward gameplay and want to tailor their risk level, requiring a robust bankroll and a patient approach in either mode.

Thunder vs Underworld by Pragmatic Play is a compelling and highly innovative casino game that redefines the mythological slot genre with its dual-mode gameplay. With its exceptionally high RTP (up to 98.04%) and selectable high to very high volatility, this online slot offers an exhilarating and customizable experience. The powerful expanding wilds with multipliers, coupled with sticky wilds in the free spins round, ensure dynamic and action-packed gameplay that can lead to monumental payouts up to 15,000x your stake. If you’re a fan of Greek mythology, enjoy high-stakes action, and appreciate the ability to tailor your gaming experience, Thunder vs Underworld is an absolute must-try. Choose your side and let the battle for riches begin!

✅ Pros ❌ Cons
✅ Exceptionally high RTP up to 98.04%. ❌ High to Very High volatility may require significant patience.
✅ Unique dual-mode gameplay (Thunder vs Underworld) with selectable volatility. ❌ Free spins cannot be retriggered.
✅ Expanding Wilds with multipliers up to 100x. ❌ No progressive jackpot.
✅ Free Spins with sticky Expanding Wild multipliers.
✅ Strong maximum win potential of 15,000x.

Suitable for: High-volatility slot enthusiasts, fans of Greek mythology, players who enjoy strategic choices in gameplay, and those seeking massive multiplier potential.


  • Experiment with both Thunder and Underworld modes in demo play as a free slot machine to understand how their different volatilities and RTPs affect your gameplay before wagering real money.
  • Given the high volatility in both modes, manage your bankroll carefully. Start with a comfortable bet size to extend your gameplay and give yourself more chances to hit the free spins, which is where the biggest wins often occur.
  • Consider using the Bonus Buy options for direct access to the free spins round if it aligns with your strategy and budget, especially the “Special Free Spins” for guaranteed expanding wilds.

What is the RTP of Thunder vs Underworld?

The RTP (Return to Player) of Thunder vs Underworld is 98.04% in Thunder Mode and 98.00% in Underworld Mode, both considered exceptionally high for an online slot.

Does Thunder vs Underworld have a free spins feature?

Yes, Thunder vs Underworld features a free spins bonus round with sticky expanding wilds and multipliers, triggered by landing three Scatter symbols.

What is the maximum win in Thunder vs Underworld?

The maximum potential win in Thunder vs Underworld is 15,000 times your total stake.

Is Thunder vs Underworld mobile-friendly?

Yes, Thunder vs Underworld is fully optimized for mobile play, ensuring a seamless experience on smartphones and tablets across various operating systems like iOS and Android.

What is the volatility of Thunder vs Underworld?

Thunder vs Underworld offers selectable volatility: High in Thunder Mode and Very High in Underworld Mode.

How do the dual modes work?

Players choose between Thunder Mode (Zeus) for higher free spin frequency/lower payouts and Underworld Mode (Hades) for lower free spin frequency/higher payouts.

Can I buy the bonus round in Thunder vs Underworld?

Yes, there are four Bonus Buy options available, including standard and special free spins for both Thunder and Underworld modes.


  • Zeus vs Hades – Gods of War: The direct inspiration for this slot, also from Pragmatic Play, featuring similar dual-mode gameplay and high volatility.
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