Covers the studios that build for the big max win, and the Megaways and new-release rankings.
Updated
This page carries figures checked on the date above, and that window has now passed. Studios publish new RTP settings and casinos change their rules: re-check the sources at the foot of the page.
Big Time Gaming invented Megaways. Bonanza, from 2016, put six reels of two to seven symbols each under a horizontal top reel and got up to 117,649 ways to win out of it. The format now turns up all over the place, including two of the Pragmatic Play games we rank. Five of the seven BTG slots ranked here are Megaways games, and the other two use a fixed 6x4, 4,096-ways layout.
It's a short list. We've scored seven BTG games, so we rank seven, not ten. Their scores run from 6.9 to 8.4, and the top three sit within 0.1 of each other.
Two things stand out. BTG's free spins rounds are strong: five of the seven score 9. And the max bets are low, 25 at most. That doesn't make these games cheap to play. Every slot here returns less than it takes over time, and most are rated high or very high for volatility.
At a glance
Best for
Megaways fans who want the originals rather than the copies
Top pick
Who Wants to Be a Millionaire Megaways, Spin Score 8.4
Calmest pick
Extra Chilli Megaways, the only medium-high game here
The catch
RTP figures differ between BTG's two official sites on four games
Max bets
Low: from 10 on Lil Devil to 25 on White Rabbit
Skip
Danger High Voltage: 6.9, with a 95.67% RTP
7Slots scored
96.41%Median top RTP
95.67%–96.9%RTP range
17,416x–100,504xMax win range
2 of 7With lower RTP settings
High 3, Very high 3, Medium-high 1Volatility mix
On this page
The 7 best Big Time Gaming slots, ranked
Every Big Time Gaming slot we scored, in Spin Score order. Spin Score = 40% RTP, 15% max win, 30% free spins round, 15% base game. How we score
First at 8.4. Before the free spins start, the Hot Seat lets you gamble your spin count, up to 50 free spins, and those spins carry an unlimited multiplier with unlimited retriggers. That's a 9 for the bonus. The base game is Megaways with Dual Reaction cascades, so chain wins come regularly. Max win is 72,310x. The weak spot is a 96.3% RTP. It's a licensed game, so it isn't offered everywhere, and the max bet stops at 15.
How the score breaks down, and the fine print
Return to playerData · 40%7.9
Max winData · 15%10.0
Free spins roundEditors · 30%9.0
Base gameEditors · 15%7.0
What it is: A licensed game-show Megaways slot with up to 117,649 ways and cascading wins. Before free spins you can gamble the spin count in the Hot Seat.
Free spins round: Hot Seat gamble lets you play up to 50 free spins, which carry an unlimited multiplier and unlimited retriggers.
Base game: Megaways with Dual Reaction cascades gives regular chain wins in the base game.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
The biggest max win on the page at 100,504x, and a top RTP of 96.43%. That's 8.3. The bonus offers two types of free spins, and collecting Heartstopper symbols builds toward stronger versions of both. Smart design. The base game is the problem: Angel Wilds can land on the central reels, and otherwise spins are fairly dry. playin.com rates its volatility 9.3 out of 10. Max bet is only 10. BTG lists the RTP as a range, 96.31% to 96.43%, and playin.com says 96.47%.
How the score breaks down, and the fine print
Return to playerData · 40%8.3
Max winData · 15%10.0
Free spins roundEditors · 30%9.0
Base gameEditors · 15%5.0
What it is: A 6x4, 4,096-ways slot themed on The Cult's song, with Lil Devil and Angel wilds. The bonus offers two free spins choices that Heartstopper collection can upgrade.
Free spins round: A choice of two free spins types, and collecting Heartstopper symbols builds toward enhanced versions of both.
Base game: Angel Wilds can land on the central reels; otherwise base spins are fairly dry.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
The calmest game here, rated 6.9 out of 10 by playin.com, and tied second at 8.3. Free spins come with a gamble wheel that can push the count up to 24, and an unlimited multiplier that rises with each cascade. Cascades and the extra reel give frequent small chains in the base game. Max win is 24,236x. BTG gives the RTP as 96.15% to 96.41%, while playin.com shows 96.63%. Feature Drop, the bonus buy, isn't offered in the UK. If you only try one BTG game, I'd make it this one.
How the score breaks down, and the fine print
Return to playerData · 40%8.2
Max winData · 15%8.7
Free spins roundEditors · 30%9.0
Base gameEditors · 15%7.0
What it is: A Megaways slot with up to 117,649 ways and cascading wins, set in a Mexican market. Feature Drop lets you buy free spins, which carry an unlimited win multiplier.
Free spins round: Free spins come with a gamble wheel to raise the spin count up to 24, and an unlimited multiplier that rises with each cascade.
Base game: Cascades and the extra reel give frequent small chains in the base game.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
5x2-7 Megaways (extending reels in bonus), 16,807 ways (up to 248,832 in free spins)
Released Oct 2017
Bets 0.1–25
An Alice in Wonderland game on five reels and 16,807 ways that grows in free spins: cake symbols add rows until the game reaches up to 248,832 ways. That's the best bonus idea here and it scores 9. The base game scores 5, with caterpillar wilds and the Queen's Reels feature but plenty of quiet spins. Max win is 17,416x, the lowest on the page. The Feature Drop price falls as you collect BTG coins. Not available in the UK. Score 8.0.
How the score breaks down, and the fine print
Return to playerData · 40%8.3
Max winData · 15%8.2
Free spins roundEditors · 30%9.0
Base gameEditors · 15%5.0
What it is: An Alice in Wonderland Megaways slot on 5 reels with 16,807 ways. Free spins extend the reels to up to 248,832 ways, and the Feature Drop price falls as you collect BTG coins.
Free spins round: Free spins use Extending Reels: cake symbols add rows until the game reaches up to 248,832 ways, and Feature Drop lets you buy in at a falling price.
Base game: Caterpillar wilds and the Queen's Reels feature appear in the base game, but many spins are quiet.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
The highest RTP on the page at 96.9%, worth a 9.7 on that factor, and a 77,800x max win. So why only 7.9? Because neither BTG nor playin.com publishes how its free spins work, so we scored the bonus as a standard round, 5. The base game is good: adjacent reels can clone into 3 to 6 identical reels on any spin, plus full reel wilds. playin.com rates its volatility 10 out of 10. No bonus buy. A better game than its score, maybe, but we don't score details nobody has published.
How the score breaks down, and the fine print
Return to playerData · 40%9.7
Max winData · 15%10.0
Free spins roundEditors · 30%5.0
Base gameEditors · 15%7.0
What it is: An Egyptian Megaways slot with up to 117,649 ways. On any spin, adjacent reels can clone into 3 to 6 identical reels.
Free spins round: Sources describe Full Reel Wilds and Reel Clone; the free spins details are not published by the provider, so this is scored as a standard round.
Base game: Cloned reels can burst into 3 to 6 matching reels on any spin, plus full reel wilds.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
The first Megaways game. Spell GOLD for 12 free spins with an unlimited multiplier that rises by 1 on every cascade and never resets, plus retriggers. Still one of the best bonus rounds around, and it scores 9. Cascades and the horizontal top reel keep the base game moving. What sinks it to 7.9 is RTP: BTG lists 96.0%, which scores 7.0, while playin.com shows 96.11%. Max win is 26,000x. Our Bonanza Megaways guide covers it in full.
How the score breaks down, and the fine print
Return to playerData · 40%7.0
Max winData · 15%8.9
Free spins roundEditors · 30%9.0
Base gameEditors · 15%7.0
What it is: The first Megaways slot: 6 reels of 2 to 7 symbols plus a horizontal reel, up to 117,649 ways, with cascading wins. Free spins add an unlimited progressive multiplier.
Free spins round: 12 free spins from spelling GOLD, with an unlimited multiplier that rises by 1 on every cascade and never resets, plus retriggers.
Base game: Cascading Dual Reaction wins and a horizontal top reel keep the base game moving.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Last at 6.9, and RTP is why: BTG lists 95.67%, the lowest here, which scores 6.0. playin.com shows 96.22%, so check the game's info screen. The 6x4, 4,096-ways base game relies on electric and fire wilds. The bonus is a real choice. High Voltage Free Spins, or Gates of Hell Free Spins, where a random symbol becomes a sticky wild for the whole round. Max win is 28,190x. Based on the Electric Six song. Fun, but at that RTP I'd play something else.
How the score breaks down, and the fine print
Return to playerData · 40%6.0
Max winData · 15%9.0
Free spins roundEditors · 30%8.0
Base gameEditors · 15%5.0
What it is: A 6x4, 4,096-ways slot based on the Electric Six song, with two kinds of wilds and a choice of two free spins rounds.
Free spins round: A choice of two free spins rounds: High Voltage Free Spins, or Gates of Hell Free Spins where a random symbol becomes a sticky wild for the whole round.
Base game: Electric and fire wilds land in the base game; otherwise wins come from regular 4,096-ways hits.
RTP, volatility and max win as Big Time Gaming publishes them, checked on November 3, 2026. A casino may run a lower RTP setting: check the game’s info screen.
Demo buttons open the free-play version on the game studio’s own site: no deposit, no account. We are not paid for them. How we make money
What Big Time Gaming is known for
Megaways, obviously. Reels that change height every spin, so the number of ways to win changes with them, up to 117,649 on a standard six-reel game. BTG pairs that with cascades on most of its games and with unlimited multipliers in the free spins that keep growing for the whole round. Bonanza, Extra Chilli and Millionaire all work that way.
The volatility mix leans high. Using playin.com's 0 to 10 scale, three games are high, three very high and one, Extra Chilli, medium-high. Max wins run from 17,416x to 100,504x. Hit rates are steady across the board, from 37.04% on Millionaire to 41.88% on Danger High Voltage, which says more about how often small cascades land than about big wins.
BTG's own site says it launched in 2011, was founded by Nik Robinson, released Bonanza in 2016 and was acquired by Evolution in 2021. It lists its office in Surry Hills, New South Wales. The same page calls Megaways revolutionary. That's their word.
RTP: two official sites, two sets of numbers
BTG doesn't publish the tidy lists of RTP settings other studios do. Its game pages give a single figure for five of the seven ranked games and a range for two: Lil Devil at 96.31% to 96.43% and Extra Chilli at 96.15% to 96.41%.
Then there's playin.com, which our researchers describe as Evolution's official studio site for BTG. On four games its RTP differs: 96.47% for Lil Devil, 96.63% for Extra Chilli, 96.11% for Bonanza and 96.22% for Danger High Voltage. We score from bigtimegaming.com. Danger High Voltage is the one where the gap matters most, 95.67% against 96.22%.
The fix is the same as anywhere: open the game's info screen at your casino and read the number there. Our RTP guide explains why half a point is worth checking.
Why the max bets are low
BTG games top out between 10 and 25 per spin: 10 on Lil Devil, 12 on Queen of Riches, 15 on Millionaire, 20 on Extra Chilli, Bonanza and Danger High Voltage, and 25 on White Rabbit. Other studios on this site commonly go to 100.
Our sources don't say why. Whatever the reason, it doesn't make the games safer. Megaways games at high volatility can run through a budget quickly at a small stake. Set your limit first and pick a stake that gives you a few hundred spins inside it.
How to pick among them
Start with Extra Chilli if you're new to BTG. It's the calmest game here, it has a strong bonus, and it scores 8.3. Bonanza is the classic, with the best-known free spins of the lot, but its 96.0% RTP costs it.
Lil Devil and White Rabbit are for players who want a bonus with more moving parts and can live with quiet base games. Millionaire is the all-rounder, if your market carries it.
Feature Drop, BTG's bonus buy, isn't offered in the UK on Extra Chilli, White Rabbit or Bonanza. Where it is offered, I'd skip it. It turns a slow loss into a fast one. The demo shows the round for free. For more games built the same way, see our Megaways slots page.
What to skip
Danger High Voltage, unless your casino shows the higher RTP figure. At 95.67% it's the only game here below 96%, and the base game is thin. The bonus choice is fun, but there are better versions of the sticky wild idea on other pages of this site.
Also skip the Hot Seat gamble on Millionaire if losing free spins will bother you; it can cut your spin count as well as raise it. And skip anything BTG makes if you came looking for a steady, low-volatility game. That isn't what this studio builds.
Frequently asked questions
What is the best Big Time Gaming slot?
Who Wants to Be a Millionaire Megaways at 8.4 on our Spin Score, with Lil Devil and Extra Chilli Megaways close behind at 8.3. Millionaire wins on its Hot Seat free spins and a 72,310x max win.
Did Big Time Gaming invent Megaways?
Yes. BTG's own site credits its Megaways mechanic and says Bonanza launched in 2016. Bonanza Megaways was the first Megaways slot, with up to 117,649 ways. See our Bonanza Megaways guide.
Who owns Big Time Gaming?
Evolution. BTG's own site says Evolution acquired the studio in 2021. BTG was founded by Nik Robinson and, per the same page, launched in 2011.
What RTP do Big Time Gaming slots have?
On BTG's own pages the ranked games run from 95.67% (Danger High Voltage) to 96.9% (Queen of Riches Megaways). Evolution's playin.com shows different figures for four of them, so check the info screen in the game itself.
Why does Queen of Riches Megaways score only 7.9 with a 96.9% RTP?
Because the free spins round is 30% of the score, and neither official site describes how Queen of Riches' free spins work. We scored that round as a standard one, 5 out of 10, rather than guess. Bonanza Megaways ties it at 7.9 with a much lower RTP, thanks to a bonus that scores 9.
Further reading
Official sources
Big Time Gaming: About– Launched in 2011, founded by Nik Robinson, Bonanza launched 2016, Megaways 117,649 ways, acquired by Evolution in 2021, Surry Hills NSW office, checked November 3, 2026
playin.com: Who Wants to Be a Millionaire Megaways– Who Wants to Be a Millionaire Megaways: Volatility 8.4/10, max payout 72310x, hit frequency 37.04%, min/max bet 0.2/15.0, grid, bonus buy; RTP shown as 96.3%, checked November 3, 2026
playin.com: Lil Devil– Lil Devil: Volatility 9.3/10, max payout 100504x, hit frequency 37.68%, min/max bet 0.1/10.0, grid, bonus buy; RTP shown as 96.47%, checked November 3, 2026
playin.com: Extra Chilli Megaways– Extra Chilli Megaways: Volatility 6.9/10, max payout 24236x, hit frequency 37.52%, min/max bet 0.2/20.0, grid, bonus buy; RTP shown as 96.63%, checked November 3, 2026
playin.com: White Rabbit Megaways– White Rabbit Megaways: Volatility 8.9/10, max payout 17416x, hit frequency 38.04%, min/max bet 0.1/25.0, grid, bonus buy; RTP shown as 96.42%, checked November 3, 2026
playin.com: Queen of Riches Megaways– Queen of Riches Megaways: Volatility 10.0/10, max payout 77800x, hit frequency 39.48%, min/max bet 0.2/12.0, grid, bonus buy; RTP shown as 96.9%, checked November 3, 2026
playin.com: Bonanza Megaways– Bonanza Megaways: Volatility 7.4/10, max payout 26000x, hit frequency 37.94%, min/max bet 0.2/20.0, grid, bonus buy; RTP shown as 96.11%, checked November 3, 2026
playin.com: Danger High Voltage– Danger High Voltage: Volatility 7.0/10, max payout 28190x, hit frequency 41.88%, min/max bet 0.2/20.0, grid, bonus buy; RTP shown as 96.22%, checked November 3, 2026
