Something is hunting across the reels, and it is bigger than anything you have seen before.
Monster Blox is a 2021 high-volatility release from Peter & Sons built on a base 6x4 grid that expands to 6x8 through Monster Re-spins.
Gigablox lands oversized symbols up to 6x6 on every spin, Wild Bounty drops random Wilds during re-spins, and Monster Free Spins brings a 10x panel multiplier into play.
RTP sits at 95.9% at Gamdom Casino with a 7,500x max win. The grid, the multipliers, the re-spin mechanic, and the free spins structure all deserve a closer look.
Gamdom runs Monster Blox at 95.9% RTP, which is the highest possible setting, but that's not the only reason to play this slot here. Other reasons include crypto deposits, (almost) instant withdrawals, a plethora of casino promos, and free demo access to the whole game library.
The setting is a fantasy tavern where hunters gather to collect bounties on oversized monsters. Premium symbols are illustrated monsters in various sizes and species. The Wild is the hunter himself, and the Scatter is a glowing bounty orb.
The art style is colourful and cartoonish, leaning into the exaggerated scale of the Gigablox symbols to make large block formations feel like genuine events.
Field | Detail |
| Software | Peter & Sons |
| Game Type | Video Slot |
| Reels / Rows | 6 reels, 4 rows (expands to 6x8) |
| Paylines | 40 fixed (expands to 100) |
| RTP | 95.9% |
| Volatility | High |
| Min Bet | $0.20 |
| Max Bet | $200 |
| Max Win | 7,500x |
| Jackpot | None |
*Subject to change
Gamdom runs Monster Blox at 95.9%. Volatility is high with a hit frequency of 18.40%, meaning roughly one in five spins produces a win.
Monster Blox plays from $0.20 to $200 per spin. It's suitable for budget players, when the minimum bet is used, while the maximum stake makes the top payout interesting for high rollers.
The published max win is 7,500x the bet, which is among the higher numbers when Peter & Sons slots are concerned. That said, there are a few other slots by this provider with a higher max win: Muddy Waters (20,000x), Mutagenes (12,000x), and so on.
Gigablox are oversized symbols that land on the reels as a unified block in formations from 2x2 up to 6x6. Every spin in both the base game and Free Spins can produce Gigablox symbols, including Scatter symbols.
A 6x6 Gigablox covers the entire height of the expanded 6x6 panel, and because each block functions as a single symbol across all positions it occupies, it contributes to every payline passing through those positions simultaneously.
Any winning combination in the main game awards a re-spin. During that re-spin, the panel grows by one row (from 6x4 to 6x5) and gains 15 additional paylines. Each subsequent win during a re-spin chain adds another row and another 15 paylines, up to a maximum of 6x8 with 100 paylines.
Re-spins continue until a spin produces no win. The panel size resets to 6x4 at the start of each new base-game spin.
During any spin in the base game, the hunter character can randomly transform symbols into Wilds. Gigablox symbols can also be transformed, meaning a single Wild Bounty activation can place a Wild across a large block area.
Wild Bounty occurs more frequently during Monster Free Spins and is guaranteed on no-win spins within the feature, ensuring a win on every Free Spins round.
Landing 5 or more Scatter symbols triggers the Monster Free Spins bonus game. The number of free spins awarded equals the number of Scatters on the panel at the point of trigger; Scatter Gigablox count by position (a 2x2 block counts as 4 Scatters, a 3x3 as 6, and so on).
Monster Free Spins are played on the full 6x8 panel with 100 paylines from the first spin. Each Scatter that lands during Free Spins adds 1 additional free spin and is collected into the Monster Multiplier meter.
Scatters collected during Monster Free Spins build a meter that applies a panel-wide multiplier to all wins. The multiplier steps are: 0 to 1 Scatters collected = 2x, 2 to 5 = 3x, 6 to 14 = 5x, and 15 or more = 10x.
Because additional Scatters landing also extend the feature, a Free Spins round that reaches the 10x tier has already awarded extra spins along the way, making longer features compoundingly more valuable.
The Monster Blox demo is available at Gamdom without registration. Observing how the panel expands during a re-spin chain and how Gigablox Scatters count toward the Free Spins trigger in demo is useful preparation before setting a real-money stake.
The game runs in-browser on iOS and Android. If you play it on Gamdom, all you need is a mobile browser and a stable internet connection.
A Scatter Gigablox counts multiple Scatters from a single block. Triggering Free Spins with one puts you closer to the upper multiplier tiers from the first spin. The jump from 5x to 10x requires 15 or more Scatters collected across the session, so starting high matters.
Wild Bounty activating on a Gigablox symbol during a re-spin chain can cover multiple paylines simultaneously. These are the highest-value moments the base game produces. Recognising them when they happen helps you understand where your session variance is actually coming from.
Reaching the 10x panel multiplier requires sustained Scatter landings across many Free Spins. Not every session gets there. Going in with an understanding of how Gigablox Scatter counting works gives you a clearer read on whether a given bonus round is running hot or cold.
Coin Blox: The Gigablox mechanic from Monster Blox appears here too, on a 6x6 grid with 50 paylines. RTP is 96.5%, max win 10,000x.
Bubblegum and Robo: A manga-styled 5x5 slot where VS Wilds expand to cover full reels and battle for multipliers up to x100. The visual style is pure Peter & Sons. RTP is 96.62%, max win 20,000x.
Xibalba: A Mayan underworld slot that starts on a 5x3 grid with 243 ways and expands to 7,776 through cascading wins. RTP is 96.2%, max win 20,000x.
Monster Blox delivers a mechanically coherent expanding-panel slot where the Gigablox, re-spin growth, and Monster Multiplier systems all reinforce each other. At 95.9% RTP on Gamdom with a 7,500x cap, it is a solid high-volatility session for players who want grid expansion as the core mechanic.
Slots are games of chance; outcomes are random and cannot be influenced. Set deposit or loss limits before playing. Gamdom's self-exclusion feature is available if you need to step away. External support is available at BeGambleAware (begambleaware.org) and GamCare (gamcare.org.uk).
Any win in the base game awards a re-spin. The panel grows by one row and gains 15 paylines per winning re-spin, up to a maximum of 6x8 with 100 paylines. The chain ends on a no-win spin.
Landing 5 or more Scatters triggers Monster Free Spins. The spin count equals the number of Scatter positions on the panel; Gigablox Scatters count by position (a 2x2 = 4, a 3x3 = 6). Additional Scatters during the feature add 1 spin each.
A meter built from Scatters collected during Free Spins. It steps through 2x (0 to 1 Scatters), 3x (2 to 5), 5x (6 to 14), and 10x (15 or more), applying the active multiplier to all wins across the full 6x8 panel.