Title
Developer
Rating
RTP
96%
Daily
-
Weekly
-
Cold
Reflex Gaming gives the popular "book slot" format a major facelift with Book of Blarney Gigablox. Combining the time-tested free spins mechanic with Yggdrasil’s Gigablox system, this Irish-themed release brings a lot more than leprechaun clichés to the reels.
Instead of focusing on expanding symbols like traditional "Book of" slots, this game mixes things up with reel expansions, multiple bonus features, jackpot wins, and three very different ways to chase big rewards. Whether you're a fan of Hold & Win mechanics or prefer multiplying mushroom fields, there's something here for every type of player.
Book of Blarney Gigablox is played on a 6-reel layout, where Gigablox symbols—oversized blocks that count as multiple symbol positions—can drop at any time, increasing win potential.
Wins are formed in standard left-to-right combinations, and the number of paylines can increase during certain features as reels expand.
The main gameplay highlight revolves around Book symbols, which serve as Scatters. Land 6 or more in a single spin to trigger one of three random bonus features.
-Despite the lighthearted tone, the slot handles serious gameplay under the hood, thanks to the Gigablox mechanic and a trio of feature-packed bonuses.
Book Symbol Triggers
Water Wheels Bonus
In this mushroom-themed mini-game, the number of triggering Book symbols becomes the number of spins you get. Before the round begins, you pick one of two wheels to determine volatility:
Low Volatility Wheel: x1, x2, x2, x3, x3, x4 multipliers
High Volatility Wheel: Mostly x1 with a rare x10 multiplier
Each spin allows you to select a mushroom, revealing a cash prize between 1x and 10x your stake. A wheel spin afterward applies the multiplier to that prize. It’s a bonus that balances risk and reward, with player choice affecting volatility.
Lucky Coins Bonus
This is a classic Hold & Win-style feature, played on special reels where only Coin symbols can land.
Coins award between 0.5x and 25x your bet
Some Coins hold one of four jackpots:
Mini – 20x
Minor – 50x
Major – 500x
Mega – 5,000x
2x Multiplier Coins can appear to double your total winnings
You start with 3 respins, and each new Coin that lands resets the counter back to 3. Coins lock in place, and large Scatters often transform into higher-value Coins before the feature begins.
If you fill the entire grid, the Mega Jackpot is awarded on top of all collected prizes (though it doesn’t get doubled by multipliers).
Free Spins
Landing 6+ Books can also trigger Free Spins, where the number of triggering symbols determines how many spins you get—up to 20.
Key mechanics during the bonus:
Each win awards +2 spins, up to 8 total
With each win, the reels expand by one row, and paylines increase by 15
At full size, the grid can reach 6 reels high with 100 paylines
This feature offers excellent scaling potential, especially when the reels keep expanding and extra spins stack up.
If you want to skip the wait, Book of Blarney Gigablox includes a Bonus Buy system where you can trigger any of the three features directly:
Water Wheels – 40x your stake
Lucky Coins – 60x your stake
Free Spins – 100x your stake
For a smaller commitment, you can also activate the Bonus Bet, which increases your total wager by 50% but boosts the odds of triggering any of the bonus features naturally. This option doesn’t change the symbol values but does up your chances of seeing the action sooner.
According to Roobet Casino Book of blarney Gigablox offers the following to players:
RTP: 96.0%
Volatility: High
Max Win: 10,368x
Bet Range: $0.20-$100
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