Editor’s note: Some casinos run modified RTP versions of popular slots. The figures here reflect the standard release; verify the RTP shown in the game’s info panel at your chosen casino.
The Megaways engine explained
Bonanza Megaways holds the original licence for the Megaways mechanic invented by Big Time Gaming. Each spin randomises the number of symbols on each of the six reels — anywhere from 2 to 7 — meaning the number of active ways to win changes constantly, reaching a maximum of 117,649. A horizontal reel above the main grid adds an extra symbol to every win evaluation.
For a deeper look at how Megaways geometry works compared to paylines and cluster pays, see our Megaways mechanics guide.
Cascading wins
Bonanza uses a cascade (avalanche) mechanic. Winning symbols are removed and replaced by new ones falling from above, potentially generating multiple wins from a single stake. Cascades also feed the unlimited multiplier in the bonus round.
Free spins and the unlimited multiplier
Four or more Gold Mine Scatter symbols anywhere on the reels and the horizontal strip trigger free spins. The key feature is the unlimited progressive multiplier — it starts at 1x and increases by 1 with every cascade. There is no cap. A long run of cascading wins during free spins is how the 12,000x potential is achieved.
Historical significance
Bonanza was released in 2016 and directly spawned the Megaways licensing model now used by hundreds of titles across the industry. Playing it gives useful context for understanding the mechanic at its source.
Fit and bankroll
With 96% RTP and high volatility, Bonanza rewards patience. Bonus triggers can be infrequent in the base game. The reward for patience — an unlimited multiplier inside free spins — is among the most exciting outcomes available in any slot format.