Bonanza

Bonanza is the Big Time Gaming slot that started the Megaways era. It arrived in December 2016 with a noisy gold mine theme, a reel set that changes shape on every spin and a free spins multiplier with no ceiling, and turned a mechanic almost nobody had heard of into the industry's most copied format. Nearly ten years later it is still one of the most played slots in UK casinos, kept in circulation by streamers and by a bonus round that can genuinely run away with itself.

How Bonanza plays

Six reels sit across the screen and each one shows anywhere between two and seven symbols per spin, so the grid is a different shape almost every time you press the button. When all six reels stretch to their full height the game offers 117,649 ways to win. There are no fixed paylines: matching symbols simply need to land on consecutive reels starting from the left. Above reels two to five runs a horizontal mine cart, an extra strip of symbols that feeds the grid and carries the wilds.

Every win sets off a Reaction. The symbols that paid are blasted off the grid, replacements drop in from above and slide across from the cart, and if the new arrangement pays again the process repeats. A single spin can chain several times before it settles. The letters G, O, L and D appear on the cart reel, and collecting the full set opens the free spins round. That round carries the feature Bonanza is famous for: an unlimited win multiplier that begins at 1x and rises by one with every Reaction, with no cap and no reset until the round ends. Landing further GOLD letters inside the feature extends it.

Bonanza RTP, volatility and max win

Bonanza runs at a default RTP of 96.00%, about average for a modern video slot. Big Time Gaming titles are sometimes supplied with alternative RTP settings, so check the game information screen at the casino you play on rather than assuming the headline figure applies there.

Volatility is high. The base game pays reasonably often, roughly one spin in three lands something, but a large share of those returns are worth less than the stake that bought them. The value is concentrated in the free spins, and more precisely in how far the multiplier climbs before the reactions dry up. The win is capped at 26,000x your stake, a figure that needs a top symbol combination landing across a wide grid while the multiplier is already deep into double digits. Treat that as a theoretical ceiling rather than a target. Features that end on a low multiplier are far more typical, and the gap between one bonus round and the next can be long enough to swallow a sizeable balance.

Playing Bonanza

Bonanza is one of the most widely distributed slots in the UK, so almost every licensed casino stocks it, usually in the popular or classics section. The demo on this page runs the complete game in play money mode with no account and no deposit required, which is the sensible way to see how the cart reel, the Reactions and the multiplier behave before staking anything real. The casinos listed further down this page all carry Bonanza. Where one of them attaches free spins to the game, those spins come with wagering requirements, expiry dates and win caps of their own, so read the promotion terms rather than judging the offer by its headline.

Is Bonanza worth playing?

Bonanza has aged remarkably well. The graphics look dated beside 2026 releases, but the maths holds up, and a free spins round chaining reactions with the multiplier stacking is something few imitators reproduce as cleanly. It suits players who are happy to wait, grinding through flat spins for a feature that might pay for the whole session, and it is a poor fit for anyone who wants regular returns or a short session on a small budget.

The particular risk with this game is the multiplier itself. A counter that only ever goes up makes stopping feel like bad timing, and the long dry spells between features make it easy to believe the next one is overdue. It is not: every spin is independent of the one before it. If you notice yourself raising stakes to claw back a flat run, that is the moment to close the game rather than reload it, and our responsible gambling guide sets out the deposit limits, time-outs and support services that make that easier to stick to.