MONSTER LAB
96.11%
RTP
25,000x
Max Win
Bonus buy options
- Buy Bonus100x bet
- Reels
- 7
- Rows
- 7
- Paylines (up to)
- Cluster Pays
- Min Bet
- 0.1
- Max Bet
- 1000
- Release Date
- September 17, 2026
About this Slot
Monster Lab is a horror, alchemy, zombie and sci-fi themed slot by Mask On Gaming with an RTP of 96.11%, high volatility and a maximum win of 25,000x. The game uses a 7x7 grid with Cluster Pays mechanics.
Monster Wilds substitute for other symbols and count towards clusters. After each winning cascade, Monster Wilds gain +1× multiplier individually, moving once and able to reach 999× on their own.
Power Potion multiplies all Monster Wilds by a value between 2× and 50×. When multiple Power Potions land, their multiplier values compound together.
Duplicator creates an adjacent green Wild symbol, replacing either an existing symbol or an empty space. Up to six Duplicators can appear on a single spin.
Devourer consumes two or more bottle symbols and gains +1× multiplier for each symbol eaten, with spaces refilling afterwards.
Chain converts between two and six ordinary symbols into temporary Wilds. These temporary Wilds remain in place to contribute to wins, then disappear and fall during the next cascade.
Three or more Scatter symbols trigger Free Spins, with each free spin round starting with one Duplicator, one Devourer and one Chain Wild active on the grid. Monster Wilds and their multipliers persist across the entire Free Spins round.
Buy Bonus costs 100x the current bet and triggers the Free Spins feature directly. Bonus Boost costs 3x per spin and increases the chance of triggering Free Spins when three or more Scatters land. Super Boost costs 15x per spin and increases the odds of Super, Chaos, Hidden and Secret Bonus features. Injection Spin costs 50x per spin, guaranteeing both a Power Potion and a Monster Wild starting at 2× or higher multiplier.
MONSTER LAB Community RTP
Real RTP estimated from rounds contributed by the community, across all uploaders.
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MONSTER LAB RTP Calculator
MONSTER LAB has a theoretical RTP of 96.11%. Its volatility is High, so expect long dry spells punctuated by rare, large multipliers. Its win potential is capped at 25,000x your stake. Use the calculator below to estimate your expected return, variance range and risk of ruin over any number of spins.
MONSTER LAB Variance Simulator
MONSTER LAB sessions can swing far from its 96.11% average - its volatility is rated High. The simulator runs many virtual bankroll runs to estimate the bust rate, typical drawdown and best/worst outcomes over a set number of spins - compare a cautious bankroll against an aggressive one.
All Wins
No wins on this slot yet.
Play on Stake*Frequently asked questions about MONSTER LAB
An RTP of 96.11% means MONSTER LAB is built to pay back around 96.11 for every 100 wagered over millions of spins. Any single session can land far above or below that - use the RTP calculator on this page to model your own bet size and spin count.
Over the long run MONSTER LAB's house edge is about 3.89% of everything you wager - roughly 3.89 lost per 100 staked. Short sessions vary widely; the calculator above shows the expected loss and variance range for your inputs.
Quite a lot. Because wins cluster around rare big hits, your balance can move far from the 96.11% average in either direction. The variance simulator above shows typical drawdowns, bust rate and best/worst outcomes for your bankroll.
It depends on your bet size and how long you want to play MONSTER LAB. Use the variance simulator above to test a cautious versus an aggressive bankroll and see how often each survives your target number of spins.