Most detective slots place you firmly on Sherlock Holmes’s side. Moriarty Megaways turns that arrangement around. iSoftBet built their six-reel, high-volatility Megaways-powered slots title around the antagonist — Professor Moriarty holds the title and controls the board, while Holmes and Watson are forces you must coax into play. It is a small creative decision with a surprisingly clean mechanical metaphor, and it produces a bonus round unlike most Megaways games we have reviewed.
Theme and Design
The reel set runs against a dark Victorian London backdrop — gas-lit cobblestones, silhouetted rooftops, an atmosphere pulled from a Conan Doyle short story rather than a gambling parlour. Symbol design is considered: chess pieces (a king and a pawn) for the mid-pays, a pocket watch wild, and Moriarty himself as the top-paying regular. A four-symbol tracker reel sits above the main grid, and it is the visual centrepiece of the bonus system.
Moriarty Megaways is the third entry in iSoftBet’s Twisted Tales Megaways series, following Sheriff of Nottingham Megaways and Morgana Megaways. The series formula involves morally complex protagonists and elaborate multi-reel bonus mechanics. Where Morgana Megaways built around a ten-level symbol collection system with no cascades, Moriarty leans hard into cascades and a tri-reel free spins structure — each entry meaningfully different from the last.
Watson and Sherlock Modifiers
Before the free spins trigger, two characters can intervene at random during any base game spin.
Watson drops mystery symbols across the reels, all of which resolve simultaneously to the same symbol — a guaranteed win cluster regardless of where they land. The payout depends on which symbol they reveal, but the win itself is never in doubt.
Sherlock does something different. When he appears, all six reels jump to maximum height: 117,649 ways to win for that spin. He also activates a progressive multiplier that climbs by one with each consecutive cascade, resetting only when wins stop. Sherlock is the volatility spike; Watson is the cushion — opposite tools, same spin type, a distinction that matters when both reappear in free spins.
Free Spins and the Bonus Reels
Three or more “Free Spins” scatter symbols trigger the feature: three scatters award 15 spins, four award 20, five award 25, and six award 30. A progressive multiplier starts at ×1 and increases by one after every cascading win, with no cap.
The tri-reel system is what makes the bonus distinctive. Moriarty’s reels run on every spin throughout the feature — that is the constant from which everything else builds. Watson and Sherlock each have their own separate reel sets, but both are locked at the start of the bonus. Moriarty runs every spin; his adversaries have to earn their moment.
To unlock Watson’s reels, you collect three Watson symbols on the tracker reel during free spins. When that happens, Watson Reels activate for one spin — mystery symbols fill the grid for a guaranteed win cluster — then lock again. Sherlock’s reels work the same way: collect three Sherlock symbols on the tracker and Sherlock Reels run for one spin at maximum 117,649 ways, then re-lock. Both sets require collecting again from zero to unlock a second time.
The detail that most descriptions underplay: Watson and Sherlock reel cascades feed the shared progressive multiplier alongside the Moriarty reels. The multiplier does not know which grid it is feeding — a cascade chain on any of the three reel sets pushes the same number higher. If both Watson and Sherlock symbols collect to three simultaneously, Watson plays first, then Sherlock runs immediately after.
Two safety nets also apply: three scatters landing on the tracker reel retrigger five more spins, and a Bonus Guarantee awards five extra spins if the feature total falls below 50x stake — this guarantee triggers once per normal free spins session.
Moriarty Megaways Strategy Tips
The Moriarty Bet bonus buy costs 150x stake and guarantees triggering free spins with three, four, five, or six scatters awarded at random. In Super Bonus mode, Watson and Sherlock reel unlocks occur more frequently than in standard free spins, which increases the number of enhanced spins within the feature. The Super Bonus also carries a separate guarantee: if the total win falls below 10x stake, five extra spins are awarded — and unlike the standard Bonus Guarantee, this can repeat multiple times. The Moriarty Bet is unavailable in the UK and raises RTP from 95.98% to 96.46%.
With a $0.20 minimum bet, Moriarty Megaways suits budget-friendly slot games players who want high-volatility Megaways gameplay without heavy stake commitment. The 34.3% hit frequency — approximately one win per three spins — sits at the more frequent end of high-volatility Megaways games, which helps smooth out session variance between the bigger wins. No betting pattern influences the RNG, so setting a session limit before you start is the most useful preparation.
Our Verdict
Moriarty Megaways earns its complexity. The tri-reel bonus is rewarding once you understand the collect-3 gating mechanic — Watson and Sherlock’s reels are not features you passively receive; they are rewards you work for from inside the bonus itself. The shared unlimited progressive multiplier feeding across all three reel sets gives the feature a compounding quality most Megaways titles cannot replicate, and the twin guarantees (Bonus Guarantee for normal FS, Moriarty Guarantee in Super Bonus) provide sensible floor protection without softening the high-volatility ceiling.
The base game sits in standard Megaways territory between random modifier appearances, and the 37,500x maximum win is solid rather than extraordinary. The free spins architecture, however, is genuinely inventive. To see more from the same studio, explore iSoftBet’s catalog for their broader Megaways output.
Frequently Asked Questions
What happens when Watson and Sherlock both unlock at the same time in Moriarty Megaways?
If you collect three Watson symbols and three Sherlock symbols on the tracker reel simultaneously, Watson Reels play first — mystery symbols transform and cascades resolve — then Sherlock Reels run immediately after at maximum 117,649 ways. Both reel sets then re-lock, and you start collecting again from zero for each.
Why does Moriarty Megaways put the villain in the title role?
It is a deliberate design choice by iSoftBet that mirrors the slot’s mechanics: Moriarty’s reels run throughout the bonus as the permanent base, while Holmes and Watson are forces you unlock temporarily and then lose again. The villain sets the terms; the heroes are the disruption.
Is the Moriarty Bet worth 150x stake in Moriarty Megaways?
The Moriarty Bet makes sense if your goal is to reach free spins efficiently and benefit from more frequent Watson and Sherlock reel unlocks in Super Bonus mode. The repeatable Moriarty Guarantee — five extra spins whenever the session win falls below 10x stake — adds downside protection not available in normal free spins. RTP rises to 96.46%. In markets where it is available, the 150x cost buys the most feature-rich version of the game.
