Bonus Features:Additive Symbol, Bonus Game, Bonus Symbols, Cash Collector, Expanding Symbols, Substitution Symbols, Hold and Win, Multiplier, Mystery Symbol, Nudge Feature, Random Multiplier, Respins, Stack, Wild, Wilds with Multipliers
Return to Player (RTP): 96%
Variance: Medium
Theme: Steampunk
Genre:Video Slots
Last updated on October 5th, 2025
Table of Contents
ToggleMondoplay is powering up the slot machine scene with its innovative release, Steam Engine Riches. Building on the captivating appeal of the Steampunk genre, this title injects a high-pressure surge of mechanical ingenuity and modern features into a visually stunning package.

The result is a uniquely feature-packed online slot that promises a world of brass gears, dynamic gameplay, and industrial-sized win potential. With powerful Expanding Wilds, a rewarding Nudge Feature, and four impressive Fixed Jackpots, this slot is engineered for maximum excitement. Prepare to enter a realm where Victorian invention and mechanical fortunes collide in a cloud of steam.
Steam Engine Riches immediately captures the player’s attention with its masterful and brilliantly polished design. The game’s backdrop is a mysterious engine room, filled with industrial pipes, glowing gauges, and complex machinery, creating the perfect stage for a display of mechanical power. The overall aesthetic is immersive and premium, elevating the Steampunk theme to a truly impressive status. The animations are sharp and impactful, especially when the Wild symbol expands with a clatter of gears or when the jackpots trigger with a blast of steam, adding to the game’s lively feel.
The symbols are a creative fusion of classic industrial imagery and mechanical elements. The high-value symbols are represented by icons like a mechanical gauntlet, a pair of brass binoculars, and a leather-bound book, but each has been given a polished, modern look. The lower-value symbols are a series of metallic royals, all designed with crisp, high-definition graphics that pop against the dark reels. The soundtrack complements the visuals perfectly, with an industrial, rhythmic tune that evokes a sense of invention and anticipation, punctuated by satisfying mechanical sound effects for wins and feature triggers.

Kicking off the action on a 5-reel, 3-row grid with 243 ways to win, Steam Engine Riches delivers an engaging, medium-volatility experience, backed by a solid 96% RTP and an impressive maximum win of 5,000x your stake.
Steam Engine Riches delivers a dynamic and feature-rich experience. In the base game, players will encounter Stacked Mystery Symbols on every reel, which all transform into the same symbol to create winning opportunities.
The main attraction is a special Multiplier Wild Reel that appears exclusively on reel 3, nudging to fill the entire reel and awarding a random multiplier of up to 10x. This feature also includes a Second Chance Respin on non-winning spins.
The game’s primary bonus is a Hold & Win feature, triggered by landing six or more Bonus symbols, where players collect cash prizes and aim to win one of four fixed jackpots, including a Grand Prize for filling the entire grid.
1. Stacked Mystery Symbols
2. Multiplier Wild Reel (Reel 3 Only)
3. Hold & Win Bonus Feature

Steam Engine Riches is a truly exceptional offering from Mondoplay, representing a perfect marriage of a popular niche theme and innovative, feature-rich gameplay. Its medium volatility and solid 96% RTP make for a thrilling and suspenseful session, where the bonus features provide a constant sense of excitement and huge win potential.
While the base game is enjoyable, the real mechanical magic comes from the interactive Hold and Win bonus round and the clever Expanding Wilds feature, which holds the key to the game’s impressive 5,000x maximum win. Whether you’re a fan of Steampunk worlds or a player seeking innovative and layered bonus rounds, Steam Engine Riches slot machine delivers a polished, thrilling, and mechanically rewarding experience that is not to be missed.
The RTP of Steam Engine Riches is set at 96%.
Not only does Steam Engine Riches slot machine come with free spins, but this game also comes with respins.
You can play Steam Engine Riches at any online casino that features games from the provider Mondoplay.
The maximum achievable win in a single round is capped at x5000 your bet.
Steam Engine Riches was developed and released by the innovative iGaming studio Mondoplay.
Bonus Features:Bonus Game, Cash Collector, Hold and Respin, Jackpots, Multiplier, Respins
Return to Player (RTP):96.37%
Variance: Medium
Theme: Bonus Game, Cash Collector, Hold and Respin, Jackpots, Multiplier, Respins
Genre:Video Slots
Bonus Features:Ante Bet, Bonus Buy, Cash Collector, Expanding Wilds, Free Spins, Multiplier, Retrigger, Scatter Symbols
Return to Player (RTP):96.53%
Variance: High
Theme: Asian, Fortune, Gold, Pigs
Genre:Video Slots
Bonus Features:Ante Bet, Bonus Buy, Expanding Reels, Free Spins, Multiplier, Persistent Multiplier, Scatter Symbols, Tumble, Wild
Return to Player (RTP): 96.55%
Variance: Medium-High
Theme: Zombies, Horror, School, Undead
Genre:Video Slots
Bonus Features:Bonus Game, Bonus Symbols, Cash Collector, Fixed Jackpot, Hold and Win, Respins, Wild
Return to Player (RTP): 95.78%
Variance: Medium-High
Theme: Gold, Money, Neon, Luxury
Genre:Video Slots
Bonus Features:Bonus Game, Bonus Symbols, FreeSpins, Gamble, Scatter symbols, Wild, Symbol Removal
Return to Player (RTP): 95%
Variance: Medium
Theme: Gold, Money
Genre:Video Slots
Bonus Features:Bonus Game, Bonus Symbols, Cash Collector, Expanding Symbols, FreeSpins, Multiplier, Progressive Feature, Respins, Scatter symbols, Wild
Return to Player (RTP): 96.54%
Variance: Medium
Theme: Irish
Genre:Video Slots
Bonus Features:Bonus Game, Bonus symbols, Fixed Jackpots, Free Spins, Hold and Win, Multiplier, Multiway (+1024), Mystery symbol, Random Wilds / Additional Wilds, Respins, Scatter symbols, Symbols collection (Energy), Walking Symbols, Moving Wilds, Wild Theme: Book, Candle, Cup, Halloween, Holidays, Magic, Magic wand, Magician, Illusionist, Mythical, legend, Potion, Treasures, Weapons, Witches
Return to Player (RTP): 96.05%
Variance: High
Theme: Halloween, Magic
Genre:Video Slots
Bonus Features:Additional Free Spins, Additive symbol, Bonus Game, Bonus symbols, Expanding Symbols, Fixed Jackpots, Free Spins, Guaranteed Wild in Free Spins, Hold and Win, Multiplier, Random multiplier, Reelset Changing, Respins, Risk/Gamble (Double) game, Scatter symbols, Sticky Symbols, Wild
Return to Player (RTP): 96.05%
Variance: Medium
Theme: Fruits
Genre:Video Slots
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