Underworld Inferno
96.01%
RTP
25,000x
Max Win
Bonus buy options
- Bonus BoostAnte bet2x bet
- Special Spin 130x bet
- Special Spin 280x bet
- Normal Bonus100x bet
- Super Bonus300x bet
- Reels
- 5
- Rows
- 5
- Paylines (up to)
- 15
- Min Bet
- 0.1
- Max Bet
- 1000
- Release Date
- March 31, 2026
A Stake Engine title, so there is no maker demo to embed here. On Stake it can be played without an account as Demo (Fun Play).
About this Slot
Underworld Inferno is a horror-themed slot from GG Gaming with a 5x5 grid and 15 paylines. The game has an RTP of 96.01%, high volatility and a maximum win of 25,000x.
The Skull Symbol acts as a wild and expands on winning positions. When the Skull Symbol lands on highlighted positions, it expands further and can reveal multipliers of 2x, 3x or 10x during gameplay.
Winning symbols leave their positions highlighted for use in later features. The Trigger Symbol lands on highlighted tiles to start the Coin Feature, which provides instant prizes and re-spins. When the Trigger Symbol lands, it transforms highlighted positions in the Coin Feature and causes Skull reels to retract.
The Bonus Symbol scatters with a maximum of one per reel. Three Bonus Symbols trigger the Normal Bonus, which awards 10 free spins and keeps highlighted positions locked throughout the feature. Four Bonus Symbols trigger the Super Bonus, which also awards 10 free spins, adds highlighted positions from the start of the feature and keeps all multiplier bonuses on the layout until the end.
A random reel modifier enhances winning combinations with added effects during base game play.
Bonus buy options are available for quicker access to the bonus features. Bonus Boost costs 2x bet, Special Spin 1 costs 30x bet, Special Spin 2 costs 80x bet, Normal Bonus costs 100x bet and Super Bonus costs 300x bet.
Underworld Inferno Community RTP
Real RTP estimated from rounds contributed by the community, across all uploaders.
Not enough contributed rounds yet for a reliable community RTP estimate.
At least 24,944 more rounds until this slot has a reliable RTP measurement.
Underworld Inferno RTP Calculator
Underworld Inferno has a theoretical RTP of 96.01%. 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.
Underworld Inferno Variance Simulator
Underworld Inferno sessions can swing far from its 96.01% 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 Underworld Inferno
An RTP of 96.01% means Underworld Inferno is built to pay back around 96.01 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 Underworld Inferno's house edge is about 3.99% of everything you wager - roughly 3.99 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 96.01% 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 Underworld Inferno. Use the variance simulator above to test a cautious versus an aggressive bankroll and see how often each survives your target number of spins.
