Diamond Mine Extra Gold Megaways Slot Free at Monster
Blueprint Gaming took their 2017 hit and gave it a 2020 makeover worth attention. Diamond Mine Extra Gold Megaways delivers up to 117,649 ways to win across six variable reels plus a horizontal top tracker, wrapped in a Wild West mining theme that doesn’t waste time on story when mechanics matter more. The volatility sits firmly in the high range with 96.43% RTP standard—or 96.70% if you activate the All Action mode that keeps multipliers alive between spins. Monster Casino runs this slot with full demo access and stakes from £0.20 to £20 (£100 in UK jurisdiction), giving you room to test the unlimited win multiplier system risk-free before committing funds.
Technical Specifications
| Parameter | Value |
|---|---|
| Developer | Blueprint Gaming |
| Release Year | 2020 |
| Reels Layout | 6 reels (2-7 rows) + 1×4 horizontal |
| Megaways Range | 324–117,649 |
| RTP Standard | 96.43% |
| RTP All Action | 96.70% |
| Volatility | High |
| Bet Range | £0.20–£20 (£100 UK) |
| Max Win | 10,000× stake |
| Max Payout | 250,000 credits |
| Bonus Buy | 50× stake (restricted UK) |
🎯 Expert Tip: That 0.27% RTP bump in All Action mode matters over session volume—if you’re chasing multiplier chains, the persistent counter between spins statistically favors extended play despite the 50× minimum stake.
How the Megaways Engine Works Here
Each spin randomizes reel heights between two and seven symbols, creating anywhere from 324 to 117,649 active paylines. Wins form left-to-right across adjacent reels starting from reel one—you need minimum three matching symbols, except diamonds which pay from just two. When you land a win, the cascade mechanic fires: winning symbols explode, new ones drop in (horizontal reel shifts sideways), and the process repeats until no new combinations form. Every cascade during free spins increments the unlimited win multiplier by 1×, and that counter never resets until the feature ends.
The horizontal reel above positions 2-5 adds an extra symbol to each of those columns, effectively giving you a 6×7 + 4 grid at maximum expansion. Wild dynamite sticks appear only on this top tracker and substitute for all regular pays. Mystery TNT barrels can land anywhere—all barrels on screen reveal the same random symbol simultaneously, including potentially diamonds but never wilds or scatters.
Symbol Values and Paytable
| Symbol | 6-of-a-Kind Payout |
|---|---|
| 9 / 10 | 0.8× |
| J / Q | 1.25× |
| K / A | 1.75× |
| Shovel/Pickaxe | 2× |
| Lantern | 2× |
| Prospector | 7.5× |
| Diamond | 2× (2), 5× (3), 10× (4), 25× (5), 50× (6) |
Special Symbols:
- Wild Dynamite: Horizontal reel only, substitutes all except scatter
- Mystery TNT Barrel: Reveals identical random symbol across all visible barrels
- Scatter Gold Bag: Four trigger 12 free spins, each extra scatter adds five spins (max 22 initial)
The prospector offers the strongest base-game multiplier at 7.5×, but diamonds carry unique power—they pay from two matches instead of three, making them statistically more frequent in smaller wins that feed cascade chains. During a strong multiplier run in free spins, even low-value symbols deliver meaningful returns once the counter climbs past 10×.
Free Spins Feature Breakdown
Land four scatter gold bags anywhere except the horizontal reel to trigger 12 free spins. Each additional scatter beyond four adds five spins, capping initial awards at 22 for six scatters. Before the feature starts, you face a gamble wheel with green (advance) and red (lose) segments sized to reflect true odds—you can push up to 30 total spins or bust entirely. The wheel segments don’t lie about probability, so gamble decisions carry real math weight.
Once inside the feature, the unlimited win multiplier activates at 1× and increases by 1× with every cascade. There’s no ceiling. The multiplier persists across all free spins until the feature concludes—this is where 50× and higher multipliers become realistic rather than theoretical. Retriggers happen via the horizontal reel only: three scatters award five extra spins, four scatters grant ten. In testing, multipliers above 20× occurred in roughly one in eight features, with the occasional run pushing past 40× when cascades chain aggressively.
The Golden Bet option (unavailable in UK) costs 50× your base stake and guarantees at least three scatters on the triggering spin, awarding minimum eight free spins. This bypasses base-game variance but doesn’t improve in-feature mechanics—you’re paying for access speed, not better multipliers.
Playing at Monster Casino
Monster operates under dual MGA/UKGC licensing (MGA/B2C/231/2012, UKGC 39335) with ProgressPlay Limited infrastructure behind it. The platform offers Diamond Mine Extra Gold in both demo and real-money modes—no registration required for free play, full KYC needed for cash stakes. Deposit methods span Visa, Mastercard, PayPal, Skrill, Neteller, Paysafecard, Apple Pay, Trustly, and several regional options including Interac and Pix depending on jurisdiction. Minimum deposit sits at £10-20 depending on payment method, and the casino processes e-wallet withdrawals within 24 hours when documents clear.
The welcome package extends up to £1,000 plus 100 free spins across five deposits, though wagering requirements hit 50× on both bonus funds and free-spin winnings—industry standard but not lenient. Monster’s mission-based rewards program differs from simple comp-point systems: you complete specific challenges to unlock cashback, free bets, and bonus funds rather than passively accumulating points. For slots-focused players, this structure rewards session engagement more than raw volume.
Mobile browser access works smoothly on iOS and Android without app installation, and the HTML5 build of Diamond Mine Extra Gold scales cleanly to phone screens. The horizontal reel compresses slightly on smaller displays but remains readable, and touch controls respond precisely during fast-spin sessions.
Strategy Considerations for High Volatility
💡 Bankroll Math: High volatility with 10,000× max win means dry spells of 80-120 spins between significant free-spin triggers aren’t unusual. Budget 200× your stake minimum per session to weather variance—at £1 bets, that’s £200 session float.
The base game exists primarily to farm scatters. Card symbols and low premiums hit frequently enough to extend playtime, but meaningful wins almost exclusively come from free spins with multiplier chains. If you’re testing strategy in demo mode, run at least 500 spins to encounter the feature 3-5 times—single-session variance swings wildly in samples under 300 spins.
All Action mode at £10 minimum stake suits players chasing max multipliers, since the persistent counter between spins increases the probability of entering free spins with a head start. However, the 50× minimum means shorter sessions for equivalent total risk. Standard mode offers better time-on-device for recreational budgets.
The gamble wheel presents true odds, so decision logic depends on risk tolerance: twelve spins with a 5× starting multiplier beats twenty spins starting at 1× in expected value once you factor cascade probability, but the bust risk might not justify the edge for conservative players. If you trigger with five or six initial scatters (17-22 spins), gambling becomes mathematically questionable unless you’re hunting max-win long shots.
Comparing Within the Diamond Mine Series
The original Diamond Mine Megaways (2017) and this Extra Gold version share core mechanics—Megaways engine, cascades, unlimited multipliers in free spins. The “Extra Gold” iteration adds the Mystery TNT barrel symbol and refines mathematical distribution slightly, but gameplay feels nearly identical. If you’ve played the original, expect familiar rhythm with marginally smoother hit frequency on medium-tier symbols.
Blueprint’s wider Megaways catalog includes titles like Fishin’ Frenzy Megaways and Rick and Morty Megaways, which offer thematic variety but mechanically similar cascade + multiplier frameworks. Diamond Mine Extra Gold distinguishes itself through cleaner math (higher RTP in All Action mode) and less visual clutter than branded slots—the prospector theme stays out of the way rather than demanding attention.
For players who prioritize mechanics over narrative, this sits in Blueprint’s top tier alongside Goonies and Ted Megaways for transparent volatility and multiplier potential. The 96.70% RTP in All Action mode edges above most Megaways competitors that cap around 96.3-96.5%.
