Megaways Slots Explained: How BTG's Mechanic Works and Why It Dominates in 2026
Megaways is the most licensed slot mechanic in history. We explain exactly how the variable reel system works, why it creates up to 117,649 ways to win, and the best Megaways titles available at UK casinos.
Megaways is a patented slot mechanic invented by Big Time Gaming (BTG) that creates a variable number of symbols per reel on every spin — generating an ever-changing number of ways to win that can reach up to 117,649 on a standard 6-reel implementation.
How Megaways works
In a traditional 5×3 slot, each reel always shows exactly 3 symbols, creating a fixed 243 ways to win. Megaways changes this: each reel independently randomises between 2 and 7 symbols per spin. Since wins pay on any position across consecutive reels (not fixed paylines), the number of ways to win equals the product of all reel heights. On a 6-reel Megaways with all reels showing maximum 7 symbols: 7 × 7 × 7 × 7 × 7 × 7 = 117,649 ways to win. On the same spin if reels show 2, 4, 3, 6, 7, 2 symbols: 2 × 4 × 3 × 6 × 7 × 2 = 2,016 ways to win. The Megaways counter changes with every spin, creating a dynamic experience unique to this mechanic.
Cascading wins
Megaways games almost universally use cascading wins (also called avalanche or tumble mechanics). When a winning combination forms, those symbols are removed and new ones fall in from above — potentially creating chain-reaction wins from a single spin. Cascading wins interact powerfully with multipliers in the free spins bonus, which is where the largest payouts come from.
The free spins bonus
Most Megaways games feature a free spins round where each cascade increases a win multiplier. Bonanza Megaways (the original) starts at 1× and increases by 1 with each cascade — there is no cap. A run of 20 cascades in the bonus reaches a 20× multiplier on the final win, which when combined with a full 117,649-way win can produce thousands of times the stake.
Top Megaways titles at UK casinos
Bonanza Megaways (BTG): The original. 96% RTP, very high volatility, 10,000x max win. Free spins with unlimited multiplier.
Extra Chilli Megaways (BTG): Similar mechanic to Bonanza with chilli theme. 96.2% RTP.
Dead or Alive 2 Feature Buy (NetEnt): Uses Megaways in a bonus buy context. 96.8% RTP.
Gates of Olympus Megaways (Pragmatic): Cluster pays version. 96.5% RTP.
White Rabbit Megaways (BTG): Unique expanding reel system. 97.72% RTP — one of the highest available.
Is Megaways better than standard slots?
Not inherently — the mechanic increases maximum win potential and creates exciting cascading sequences, but the RTP and house edge are comparable to standard slots. The high volatility means sessions can be more extreme in both directions. Choose Megaways for the feature experience, not as a strategy for better returns.