Bonanza Slot by Big Time Gaming at Mega Casino

Bonanza is the slot that started the Megaways era. When Big Time Gaming released it in 2016, the dynamic reel structure underneath was something the slot industry had not seen before, and the mechanic has since been licensed across hundreds of titles from rival studios. The original is still in lobbies almost a decade later because the unlimited-multiplier free spins round, the cascading-reels engine, and the mining-camp art direction have all aged well. This Bonanza slot review covers how the Bonanza Megaways engine works, what the Bonanza free spins round actually delivers, the Bonanza RTP at Mega Casino, and who the game suits.

What Is Bonanza Slot and Why Does It Matter?

Bonanza is a six-reel Megaways slot from Big Time Gaming, released in 2016. The mining-camp theme sits the reels next to a waterwheel and a wooden cabin, with cart-driven extra symbols that change the row count on every spin. The Megaways mechanic delivers up to 117,649 ways to win, and Bonanza was the first slot to use it. Almost every Megaways title released since traces its lineage back to this game.

How Does Bonanza Megaways Work?

Each of the six main reels shows between two and seven symbols on any given spin, randomly determined as the reels stop. The number of active ways to win is the product of the symbol count across the six reels. At the maximum, that comes out at 117,649. A separate carriage-driven row sits above reels two through five, contributing additional symbols to the ways-to-win calculation.

Wins are formed by matching three or more identical symbols from the leftmost reel across consecutive reels, in any position. The symbol hierarchy runs from card royals (10 through Ace) at the low end to four coloured gemstones (diamond, ruby, sapphire, emerald) at the high end. After every winning spin, the Dual Reaction cascading mechanic removes the winning symbols and drops new symbols into the empty positions, which can chain into further wins.

Free Spins and the Unlimited Multiplier

Landing four or more gold scatter symbols across the reels triggers the Bonanza free spins round, which awards twelve free spins as standard, with additional spins for any extra scatters above four. The carriage at the top of the grid carries letters that spell out FREE SPINS during the round, and additional carriage letters extend the feature length.

The headline mechanic is the unlimited increasing multiplier. Every cascading win during the free spins round increases a persistent multiplier with no upper cap. The multiplier carries across spins and only resets when the round ends. That is the reason Bonanza has a reputation as a high-variance slot with serious bonus-round potential: a long cascade chain late in the feature can produce results that the base game cannot.

RTP and Volatility

Bonanza is currently configured at 95.98% RTP on the Mega Casino game page, which is a small variant on the standard 96% figure published by Big Time Gaming. RTP is the theoretical return to player over the long term, calculated across millions of simulated spins. It is not a guarantee of any individual session result. Short sessions can run significantly above or below the theoretical figure.

Volatility on Bonanza is high. Sessions can run cold for extended periods before the scatter symbols cooperate, and the free spins round is where almost all of the game's bonus-side variance lives. That is by design. The unlimited multiplier mechanic only makes sense paired with a feature that does not trigger easily.

Stakes and Game Information Block

Minimum bet is twenty pence per spin. The maximum bet is two or five pounds, depending on the active stake table. The grid runs six reels with the Megaways structure delivering up to 117,649 ways to win. Mining theme. Bonus features include cascading reels (Dual Reaction), free spins with an unlimited increasing multiplier, and the carriage-driven extra reel above the main grid.

What Type of Player Is Bonanza Slot Design For?

Bonanza suits players who enjoy high-variance Megaways play and are comfortable with extended periods between feature triggers. It rewards patience and bankroll discipline. It is less suited to players who want frequent small wins, short sessions, or predictable base-game results. If high-volatility Megaways is your preferred style, the Bonanza ecosystem extends across several sequels and themed variants. Browse more online slots at Mega Casino to compare them directly with newer Megaways titles.

Responsible Gambling

Set a deposit limit and a session limit before opening the game. Use the reality check tool to receive on-screen prompts during longer sessions. High-volatility slots like Bonanza can deliver long stretches without features, so it pays to know when to stop. Help is available at GambleAware, and GAMSTOP offers self-exclusion across all UK-licensed operators.

Explore Megaways slots at Mega Casino. 18+ | Play Responsibly. Mega Casino is licensed and regulated by the UK Gambling Commission, Licence Number 39326.