Monsters VS GigaBlox Slot Review
Tower blocks gouged open and spitting flame, a horned demon mask crowning the reel frame, two bolted-down Cthulhu heads glaring orange from the columns: the city in Monsters VS GigaBlox is losing, and the game doesn’t mind a bit. Its sharpest idea is that the spin which triggers the bonus decides what the bonus is – the monster already dominating the grid takes over the whole round, so you’re not waiting on a feature, you’re waiting on a winner.
ReelPlay stages the fight on a 6×6 grid across 50 paylines. It runs at 95.6% RTP with high volatility, and the ceiling is 3,116x the bet. The monster-brawl format ran on through Dragons vs GigaBlox and Nightmares VS GigaBlox, a 2026 review on this site covering the latter, but this is where the scrap started.
Base Game & Features
The grid is six reels by six rows, with wins on 50 fixed paylines paying left to right. Coinciding wins add together, and only the highest combination counts on each line. Bets run from 0.50 to 75 per spin, with autoplay available alongside the standard spin controls, and the space bar spins too.
Hit frequency is 38.4%, so better than a third of spins return something. Most of those returns are small: the royals dominate the bottom of the table and pay identically, while the six monsters carry the real weight.
Gigablox
Any symbol can arrive as a Gigablox: an oversized block sized from 2×2 up to 6×6. When the reels stop, each block breaks apart into its individual symbols for the pay cycle, so a single big landing can feed dozens of paylines at once and stack up coinciding wins.
In the base game that means royals, monsters, the wild and even the scatter can arrive in block form. A giant scatter block is what the biggest bonus triggers are built from.
A 6×6 scatter landing counts as 36 individual symbols towards the feature, worth 36 separate spins on top of the trigger itself. It’s the route to the round’s maximum, and it’s a rare one.
Symbols and Paytable
All pays are multiples of the base bet, which is the total stake divided by 50. The six monsters head the table, and the gap between the top of it and the royals at the bottom is wide:
- Top monster: 500x for six, 160x for five, 80x for four, 50x for three
- Second monster: 250x, 100x, 50x, 40x
- Third monster: 200x, 50x, 40x, 25x
- Fourth monster: 150x, 40x, 30x, 20x
- Fifth monster: 125x, 30x, 20x, 15x
- Sixth monster: 100x, 25x, 15x, 10x
- Royals: 75x for six, 15x for five, 10x for four, 5x for three, across all six symbols
The wild is a crown icon that substitutes for everything except the scatter, always standing in for whichever symbol creates the biggest possible win. Scatters pay 1x the total bet for each symbol in a winning set, and five or more of them anywhere on the grid trigger the free spins.
Blocks are where the base game gets its noise. A monster block spanning several rows alongside matching royals is how the larger base wins arrive, and even those stay modest by design.
Six of the top symbol pays 500x the base bet, a tenth of the total stake’s worth per line, so the ceiling sits a long way past anything the paytable alone delivers. The maths only closes the gap once the bonus is in play.
Monsters VS GigaBlox Free Spins
Free Spins
Five or more scatter symbols anywhere on the grid trigger the feature, and Gigablox scatter blocks count as their individual symbols, so one big block can carry a trigger on its own. The award is four free spins plus one for every triggering symbol, which means a five-scatter trigger pays nine spins and a full grid pays the 40-spin maximum.
The round plays at the triggering bet and can’t be retriggered. Everything that makes it different happens through the monsters themselves.
The Rampaging Monster
Whoever dominated the triggering spin takes over the round. That monster appears in gold for the whole feature, and every one of its symbols behaves as a wild. Ties go to the highest-paying monster, and if no monster appeared at all, the top-paying symbol takes the crown.
The selection rules matter more than they sound. Because the Rampaging Monster is decided by symbol count on the triggering spin, a scatter-heavy trigger with only one monster on the grid hands the crown to that monster regardless of rank, and a trigger with no monsters at all defaults to the top payer.
The feature you get is shaped by the spin that started it. Wins made up only of wilds and Rampaging symbols pay double the top prize, which is where the round’s biggest moments come from.
Gigablox during free spins land only as picture symbols, and they run larger on average than in the base game, so the grid fills faster and the monster counts climb. A golden block landing early can set the tone for the entire round.
Buy Bonus
Where the option is offered, the free spins can be bought outright. A spin plays out that’s guaranteed to trigger the feature, and the round then follows the standard free spins rules, Rampaging Monster and all. At the minimum stake that entry price is 37.50, rising to 5,625 at the top of the range.
- Cost: 75x the bet per spin
- Award: a guaranteed triggering spin and between 9 and 30 free spins
- Buy Bonus RTP: 96.1%
Our Honest Verdict
Overall Rating: 7.1/10
Most of a session here is waiting for the city to finish burning. Blocks land, small wins tick over, and the reason you’d pick this over any other big-grid slot is sitting behind it: the fight itself, where the monster that already owns the reels turns gold and every one of its symbols goes wild. No two bonus rounds play the same way, and that variety is earned by the spin that triggered it rather than handed out at random.
The RTP is the lowest of the three monster brawls, and the base paytable is thin enough that the quiet spells genuinely pay pocket change. The free spins do nearly all the work, and there’s no retrigger to rescue a round that starts badly.
It suits players who like one big, characterful event at the end of a long build, and it doesn’t suit anyone counting on the base game to keep them interested. The burning city is the honest picture: spectacular when something finally lands in it, smouldering the rest of the time.
Monsters VS GigaBlox FAQs
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How do you trigger free spins in Monsters VS GigaBlox?
Five or more scatter symbols anywhere on the grid trigger the free spins. Gigablox scatter blocks count as their individual symbols, so a single oversized block can carry the trigger on its own. -
How many free spins do you get in Monsters VS GigaBlox?
Four free spins are awarded plus one for each triggering scatter symbol, so the round pays between 9 and 40 spins. The feature can’t be retriggered once it’s running. -
What is the Rampaging Monster?
The monster with the highest symbol count on the triggering spin becomes the Rampaging Monster for the whole round, and all of its symbols behave as wilds. If two monsters tie, the higher-paying one wins, and if no monster appeared, the top-paying symbol takes over. Wins made only of wilds and Rampaging symbols pay double the top prize. -
What are Gigablox?
Gigablox are oversized symbol blocks that land in sizes from 2×2 up to 6×6. Each block breaks apart into individual symbols when wins are evaluated, so one landing can cover dozens of paylines at once. In the base game any symbol can arrive as a Gigablox, including the wild and the scatter. -
Do Gigablox change during free spins?
Yes. During the free spins, Gigablox land only as picture symbols, so no royal, wild or scatter blocks appear. They’re also larger on average than in the base game, which helps the monster counts build quickly. -
How much does the Buy Bonus cost in Monsters VS GigaBlox?
The free spins feature can be bought for 75x the bet per spin where the option is available. A spin plays out that’s guaranteed to trigger the feature with between 9 and 30 free spins, and the Buy Bonus runs at 96.1% RTP. -
What does the wild do in Monsters VS GigaBlox?
The crown wild stands in for every symbol bar the scatter, and it always fills in for whichever one completes the biggest available win. During the free spins, the Rampaging Monster’s golden symbols behave as wilds as well. -
What is the RTP of Monsters VS GigaBlox?
The overall theoretical return is 95.6%. The Buy Bonus variant runs slightly higher at 96.1%, and the maximum win is 3,116x the bet.
