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Bonus Overlay Symbol

A symbol's transformation is innocent

A feature where a special effect is overlaid on a regular symbol, which then awards a special bonus (e.g., free spins).

A Bonus Overlay Symbol is not an independent symbol itself, but a feature where a special effect (e.g., a golden frame, flames) is 'overlaid' on top of a regular symbol.

The core of this feature is to award an additional special prize (e.g., a jackpot) on top of the base win when a winning combination is formed with these overlaid symbols.

This adds a new layer of a 'bonus goal' to regular wins.

How It Works

This demo is a simulation for illustrative purposes and may differ from actual slot game behavior.

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Recommended by Editors

This week's recommended slots, handpicked by our editors.

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2.5(2)

Guardians of Glory

Galaxsys

Guardians of Glory is a very ambitious title from Galaxsys that integrates their unique 'Crash' game expertise into a slot.
The core excitement lies in the psychological thrill of the Catapult Gamble, where you must cash out before the explosion, and the destructive power of the Wild Sword Multiplier, which grows up to 1,024x.
With a Bonus Game expanding to 5x5 and a max win of 10,000x, it promises heavy rewards befitting the intensity of a medieval battlefield.

Mahjong Ways 2

PG Soft

Mahjong Ways 2 is a signature title from PG Soft that perfectly integrates the classic Eastern board game 'Mahjong' into a slot system.
The core of the game lies in the chain reactions from its cascading reels and the progressively increasing multiplier with each cascade.
The unique system where winning 'Golden Mahjong Tiles' transform into wilds to help the next chain reaction adds to the fun, allowing players to feel the thrill of an explosive chain reaction on every spin.

Le Cowboy

Hacksaw Gaming

Le Cowboy is a game that shares the core mechanics of Hacksaw Gaming's popular 'Le series' (like Le Bandit).
Only the theme has been changed to Western, while the 'Super Cascade' and 'Activation Field (Golden Squares)' systems remain identical.
Players will lay down Golden Squares through wins, then wait for a 'Bonus' scatter to appear and unleash their full potential.
The thrill when the 'Vault (Collector)' appears and triggers a chain reaction is the signature, proven fun unique to Hacksaw Gaming.

Congo Cash

Pragmatic Play

Congo Cash is a slot that uses a unique bonus trigger system called the 'Jewel Board'.
While spinning the reels, players simultaneously wait for a good prize (like a jackpot or free spins) to appear on the Jewel Board above, and for the 'Butterfly' symbols on reels 1 & 5 and the 'Logo' symbol on the center reels to land at the same time to snatch that prize.
When free spins are triggered, a 'Guaranteed Wild' is provided on every spin, offering stable yet powerful winning opportunities.

Reactoonz 2

Play'n Go

Reactoonz 2 is a sequel that inherits the core fun of the original while adding much more complexity and strategic depth.
Players must now go beyond simply collecting symbols; they need to charge the 'Fluctometer' with 'fluctuating symbols' to create 'Electric Wilds', and then use those 'Electric Wilds' to charge the 'Quantumeter' and summon the final boss, 'Gargantoon'.
The mechanism, much more complex than the original, provides an unparalleled thrill and sense of achievement when successfully triggered.

Tombstone No Mercy

Nolimit City

Tombstone No Mercy is an upgraded version of the legendary 'Tombstone', keeping its core gameplay intact while adding a higher max win and bonus buy options (xBet®, Nolimit Bonus).
The game revolves around Nolimit City's iconic xNudge® Wild, and features two powerful bonuses: 'Justice Spins' offering the thrill of sticky wilds, and 'Gunslinger Spins' with the explosive power of an accumulating multiplier.
It's a perfect choice for fans of the original and players who enjoy extreme high-volatility thrills.

Sizzling Eggs

Wazdan

Sizzling Eggs is a unique slot, similar to Wazdan's '9 Coins' series, which offers no wins in the base game and concentrates everything on the 'Hold the Jackpot™' bonus.
The core of this game is the 'Collector Egg' that appears and accumulates value in the base game.
The biggest charm is to grow these 'Collector Eggs', enter the bonus, and aim for the 2,500x max win through the synergy of various special symbols encountered in the bonus round.

Pirots 4: Frozen Fury

ELK Studios

Pirots 4: Frozen Fury transports the series' core 'CollectR™' system to the Ice Age, adding a new dimension of interaction.
While maintaining the original's addictive collection fun, it introduces new special feature symbols fitting the theme, such as the Mammoth, Sabretooth Tiger, and Ice Blocks, creating even deeper and more unpredictable chain reactions.
The potential unleashed in the free spins, where all growth elements are persistent, is more than enough to continue the series' legacy.

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