Bonanza

Let’s be clear about what Bonanza is before we grade it: this is the slot that lit the fuse. Big Time Gaming didn’t invent Megaways here — Dragon Born got there first back in 2015 — but Bonanza (2016) is the game that turned the shape-shifting reel engine into an industry religion. Nearly a decade on, I still fire it up, and the honest verdict is that it holds up far better than most of the me-too Megaways clones it spawned. It’s a mining-themed classic with genuine bite, and it earns its place in any conversation about BTG’s best work over on our reviews page.

Theme & presentation

A dusty rock quarry, pickaxes, dynamite, and a rickety little mine-cart reel rattling along the top. The theme is workmanlike rather than gorgeous — this is 2016 visuals, and it shows. Symbols are chunky gemstones and playing-card royals, the palette is browns and greys, and there’s nothing here that’ll make your jaw drop next to a modern Nolimit or Hacksaw production. But the banjo-and-harmonica soundtrack is genuinely charming, twanging along in the background, and it swells into a proper hoedown when Reactions start chaining. It’s got character. I’d take honest atmosphere over sterile polish any day.

How it plays

Six reels, each showing a random 2–7 symbols per spin, plus that horizontal mine-cart reel feeding extra symbols across reels two to five. Stack it all up and you get anywhere from 64 to 117,649 ways to win on any given spin. Wins pay left-to-right on adjacent reels, and every win triggers Reactions — BTG’s cascade — where winning symbols explode, new ones drop from above and slide in from the right, and you keep going until nothing lands. It’s satisfying to watch.

I’ll be candid: the base game is a grind. Bonanza is high volatility, and the base game’s job is essentially to get you to the bonus. Small cascades tick you along, the occasional cluster of high gems gives a decent hit, but you’re not making rent down here. You’re mining for the GOLD.

Free Spins & the unlimited multiplier

This is the heart of it, and it’s why Bonanza still matters. Four GOLD scatter tiles — G, O, L, D — must land, one letter each, on the six main reels to spell the word. Note they land on the reels themselves, not up on the mine-cart carriage. Do it and you bank 12 free spins, with each extra scatter beyond the four adding 5 more.

Here’s the mechanic that made streamers scream: during free spins there’s an unlimited win multiplier. It starts at 1x and climbs by 1x with every single Reaction — and crucially it never resets for the whole round. So a long cascade chain doesn’t just pay its own wins; it ratchets the multiplier that pays every subsequent win. String enough Reactions together and that number climbs into the double and triple digits while your wins keep landing on top of it. That’s the snowball. That’s how a quiet 15x round and a life-changing one come from the same trigger.

You can also keep the round alive by landing further GOLD scatters during the bonus — each retrigger tops up your remaining spins, so a hot bonus can run long. The catch, and it’s a real one, is that the trigger is stubborn. You can spin a long, cold time before GOLD spells out, and plenty of bonuses fizzle at a modest multiplier. The variance is the price of the ceiling.

The numbers, straight

• Max win: 12,000x on the original engine (some relaunched/remastered versions quote 26,000x — check your operator’s paytable)
• RTP: 96% (about average — see our high-RTP list for punchier alternatives)
• Volatility: High (4/5)
• Reels/ways: 6 reels, up to 117,649 ways via the Megaways engine
• Hit rhythm: Frequent small cascades, but genuinely bonus-dependent for anything big
• Bonus Buy/Ante: No feature buy on the original — you earn the bonus the hard way

Verdict

Bonanza is a landmark that still plays like a good slot, not just a museum piece. The base game drags and the visuals are dated, but the free-spins engine — that uncapped, cascading multiplier — remains one of the most thrilling bonus mechanics ever shipped. It’s all upside potential and cold patience; there’s no middle ground and no safety net, so know the house keeps its edge here as everywhere.

SlotWhizz rating: 4.3/5.

Big-win potential: elite, thanks to the unlimited multiplier — but strictly bonus-gated. Base game is a patience test; the feature is a firework. Come for the GOLD, not the grind.

18+. Demo for fun, not profit. The house keeps an edge. Play responsibly.