Monster Blox Slot Review

Expert Rating: 4.5 out of 5
Review by Chris Taylor
Last update 22nd November 2021
Review by Chris Taylor
Last update 22nd November 2021

Head to a mediaeval tavern where a band of heroic warriors are ready to take on invading creatures in the Monster Blox slot. Created by Peter & Sons, each spin starts with 6 reels and 40 paylines. Land a win and you’ll get a re-spin on a machine where 1 extra row is added. The game grid can expand to 8 rows high with 100 paylines. On any spin, the Hunter can fire an arrow onto the reels and turn a standard symbol into a wild. This includes the Gigablox symbols which can range from 2×2 to 6×6 in size. The Free Spins feature is played on the full expanded reels, complete with an increasing multiplier which can reach 10x. Find out more in our in-depth Monster Blox review.

Monster Blox Max Win
7,400 x bet
Peter & Sons
Type of Slot
Video Slot
Stakes Range
20p to £100
Bonus Features
Yes (4)
Free Spins/Multiplier
Max Win
7,400 x

Monster Blox Demo

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Monster Blox Slot RTP, Details & Wager Limits

Reels/Paylines: 6 reels + 40-100 paylines

Stakes Range: 20p to £100 per spin

Max Win: 7,400 x stake per spin

RTP: 96.15%

Each base game spin in the Monster Blox slot starts on 6 reels, 4 rows and 40 paylines. Winning combinations trigger re-spins. Each successive re-spin increases the number of rows and boosts the paylines by 15, up to a maximum of 100. To create a winning combination, land 3, 4, 5 or 6 matching symbols or wilds from left to right in a payline, starting from the leftmost reel.

Bet levels range from between 20p and £100 per spin. Click on the Bet box then choose one of the 19 different stake levels. Click on the 3 lines to access the paytable. Payout amounts are displayed in cash relative to your current stake level.

The Monster Blox RTP is 96.15%. The hit frequency rate is 18.4% so you can expect to land a winning combination on just under a fifth of spins.

This is a volatile slot. The action definitely comes into the high variance category. The most you can potentially win from a single spin here is 7,400 x your total stake.

Theme – Audio & Design Features – mediaeval hunters battle monsters 

Theme: Mediaeval

High Value Symbol: Red Dragon (Monster 4)

Compatibility: Mobile, Tablet, Desktop


Like the other games from the Peter & Sons catalogue, the design in the Monster Blox slot is very stylishly done. With a mediaeval theme, the story is that monsters of all sizes are assailing the lands with heroes battling them for bounties.

There’s a stirring soundtrack pumping away while you spin. It’s a good fit for this fantasy theme. As usual for a Peter & Sons slot, there’s little to gripe about when it comes to design.

The reels are set within a stone building where you’ll find playing card suit symbols and 4 higher paying monster symbols. The best paying symbol is the red dragon which pays 10 x your total stake if you land 6 on a payline.

On each spin, at least 1 symbol will appear in Gigablox formation. These are oversized blocks of matching symbols that can be anything from 2×2 right up to 6×6 in size. The Gigablox mechanic has been licensed from creator Yggdrasil Gaming.

There’s also a hunter wild symbol which performs the usual substituting duties. These can appear randomly from 1 of the bonus features. Finally, there’s the free spins scatter. Here’s a list of all payouts by symbol:

Symbol Payouts/Info
monster-blox-slot-diamond-symbolDiamond 3, 4, 5 or 6 = 0.1, 0.2, 0.4 or 0.8 x stake
monster-blox-slot-spade-symbolSpade 3, 4, 5 or 6 = 0.1, 0.2, 0.4 or 0.8 x stake
monster-blox-slot-club-symbolClub 3, 4, 5 or 6 = 0.1, 0.2, 0.4 or 0.8 x stake
monster-blox-slot-heart-symbolHeart 3, 4, 5 or 6 = 0.1, 0.2, 0.4 or 0.8 x stake
monster-blox-slot-monster-1-symbolMonster 1 3, 4, 5 or 6 = 0.25, 0.5, 1 or 2 x stake
monster-blox-slot-monster-2-symbolMonster 2 3, 4, 5 or 6 = 0.3, 0.6, 1.2 or 2.5 x stake
monster-blox-slot-monster-3-symbolMonster 3 3, 4, 5 or 6 = 0.5, 1, 2 or 5 x stake
monster-blox-slot-monster-4-symbolMonster 4 3, 4, 5 or 6 = 1, 2, 2.5 or 10 x stake
monster-blox-slot-hunter-wild-symbolHunter Wild Substitutes for all symbols above
monster-blox-slot-free-spins-scatter-symbolFree Spins Scatter 5+ trigger Monster Free Spins feature

Monster Blox Mobile


Monster Blox is available to play on all devices including desktop computers, tablets and smartphones. The classy visuals and innovative gameplay work nicely on the handheld devices. The Monster Blox mobile slot is very playable, even given the variety of moving parts.

Monster Blox Bonus Features

Peter & Sons have packed a good range of extras into Monster Blox (Gigablox). With 4 bonus features, look out for oversized blocks of symbols, randomly added wilds, re-spins and free spins with multipliers that can send payouts rocketing by up to 10x.

Wild Bounty feature

To the side of the reels, you’ll see an animated Hunter character. He can come to life on any spin and fire at the reels. Any positions that are struck turn into wilds. This can include Gigablox symbols. Known as the Wild Bounty feature, expect to trigger this extra more regularly during the free spins round than during the base game.

Monster Re-Spin feature


The Monster Re-Spin feature triggers each time you land a winning combination. A re-spin is awarded. This takes place on a machine where an extra reel has been added. Each extra reels also brings with it an addition 15 paylines.

Successive re-spins can take the size of the game grid to a maximum of 8 rows high. When that happens, the number of paylines rises to the maximum of 100:

4 rows 40 paylines
5 rows 55 paylines
6 rows 70 paylines
7 rows 85 paylines
8 rows 100 paylines

The re-spins continue until no new winner is formed. When that happens, the reels reset to their original 6 reel, 4 row, 40 payline set up. The Wild Bounty feature can trigger randomly during the re-spins too.

Free Spins feature


To trigger the Free Spins feature, you’ll need to land 5 or more Free Spins scatter symbols anywhere on the reels on the same spin. The number of free spins awarded is equal to the number of triggering scatters. This means a minimum of 5.

The free spins play out on a fully expanded 6 reel, 8 row, 100 payline machine. Each scatter that lands here adds 1 more free spin to your total.

Scatters that land during the feature are also collected. Collect enough of them and you’ll bring the Monster Multiplier feature into play:

0-1 scatters 2x multiplier
2-5 scatters 3x multiplier
6-14 scatters 5x multiplier
15+ scatters 10x multiplier

Monster Blox Review Summary – riches awaits when you take down monsters

Theme & Symbols

Sounds & Music

Bonus Features

RTP (96.15%)

Max Win (7,400 x)


There’s plenty going on in the Monster Blox slot. The design is typically impressive from Peter & Sons as they stick to their unique look and feel.

The re-spins, expanding reels and random transforming wilds keep the base game ticking over. However, it’s the Free Spins feature with increasing multipliers where the bigger wins will come from. Add in the Gigablox symbols which appear on every spin for a unique offering.

With 7,400 x your total stake max wins available on each free spin, the key to winning big is from the 10x multiplier and 100 paylines. Put all that together and you have a very playable slot that breathes new life into a classic, familiar theme.

Whilst other Gigablox slots, like 90k Yeti Gigablox by 4ThePlayer, offer bigger wins, Monster Blox combines all features beautifully alongside unique design. If you like Peter & Sons slots, Robin: Nottingham Raiders is their most popular title with huge 121,500 x stake max wins available.

  • Superb design + visuals
  • Great use of Gigablox mechanic
  • Big multipliers in free spins
  • Lower max wins than other Gigablox slots

Monster Blox FAQs

What is the Monster Blox RTP?

The Monster Blox RTP rate is 96.15%. The volatility is high and the hit frequency rate is 18.4% meaning you can expect a win every 5 spins or so on average.

What is the Monster Blox max win?

The most you can win is 7,400 x your total stake per spin. This can be won in the free spins due to the potential 10x multiplier and when you play with 100 paylines.

Are there any Monster Blox free spins?

Yes, the Free Spins feature begins with at least 5 free spins and is played with 8 rows and 100 paylines. Each scatter adds another free spin and is collected. Collect 15+ scatters to increase the multiplier up to 10x.

What are Gigablox?

Gigablox are special blocks of symbols that appear on each spin. These oversized blocks of symbols can range from 2×2, right up to 6×6 in size. The 6×6 block is the equivalent of 36 standard symbols.