Quick verdict: 1 Million Megaways BC is Iron Dog Studio's take on the Megaways format at its most literal — an Ice Age setting built around a "Mammoth reel" that can lock in at nine symbols, pushing the maximum ways to win past the one-million mark (1,058,841, to be exact). Add tumbling wins with an increasing base-game multiplier and a Lock-it Reels free spins round, and you get a high-volatility slot built for players chasing genuinely oversized win potential rather than frequent small hits.
The Story
Iron Dog Studio, part of the 1x2 Network group, released 1 Million Megaways BC in September 2020 as a prehistoric spin on the Megaways mechanic Big Time Gaming had popularised a few years earlier. The "BC" in the title is the joke and the theme in one: a Stone Age setting of cave dwellers, sabre-toothed tigers, Irish elk and a woolly mammoth, all rendered as the game's symbol set. There's no real narrative beyond that premise — the game exists to make good on its name, since Iron Dog built the reel mechanics specifically to push past the one-million-ways ceiling that had, until then, been treated as the practical limit for a six-reel Megaways title.
Theme, Gameplay & Symbols
The base game runs on six reels that can each hold between two and seven symbols, generating up to 117,649 ways to win before the game's signature mechanic gets involved. Low-paying symbols are the usual card royals (9 through A); higher-paying symbols draw on the Ice Age cast — a cave man, cave woman, Irish elk, sabre-toothed tiger and, at the top of the pay table, the woolly mammoth itself.
Wins tumble rather than simply pay and clear: winning symbols are removed from the grid, new symbols cascade down to fill the gaps, and each consecutive tumble in a single spin sequence increases a multiplier that applies to the base game's wins, capping at x8. It's the same tumbling-plus-multiplier shape used across a lot of modern slot design, and here it's doing double duty — because four consecutive tumbles in the base game is also the trigger for the free spins round.
Presentation & Sound
The art direction leans into the Ice Age premise without overplaying it for laughs — the symbol set is bold and clearly rendered rather than cartoonish, with the mammoth symbol in particular given a lot of visual weight given its role as the game's headline feature. The base game reels sit against a snow-and-rock backdrop that darkens and intensifies once the ground starts to "tremble" ahead of the Mammoth reel's introduction, giving the transition into free spins a genuine sense of escalation rather than just a static graphic swap. Sound design follows the same restrained approach: rumbling low-end cues build tension as tumbles stack up, without resorting to the exaggerated fanfare some Megaways titles lean on.
How to Play 1 Million Megaways BC
- Set your stake using the bet controls — 1 Million Megaways BC accepts bets from £0.20 up to £20 per spin, though UKGC rules cap online slot stakes at £5 per spin (£2 for 18–24-year-olds), so UK players can’t stake anywhere near the top of that range.
- Check the paytable to see the current symbol values and confirm you understand the tumbling and Lock-it Reels mechanics before playing for real money.
- Hit spin. Each reel will display between two and seven symbols, generating a variable number of ways to win on every spin.
- Watch for consecutive tumbles — winning symbols clear and new ones cascade down, with the base-game multiplier increasing by one after each successive tumble in the same spin sequence, up to x8.
- Land four consecutive tumbles in one spin sequence to trigger the free spins round and introduce the Mammoth reel.
- During free spins, watch the Lock-it Reels feature: any of the six main reels that reaches its maximum seven symbols locks in place for the rest of the round and adds +1 to the round's multiplier; if the separate Mammoth reel reaches its maximum nine symbols, it locks too and awards five extra free spins.
- 1 Million Megaways BC includes a Buy Bonus feature in some markets that lets players purchase 6 to 14 free spins directly for between 50x and 270x the current stake, but this option is switched off for UK players — bonus-buy features of this kind were effectively prohibited for UK-licensed online slots by the Gambling Commission's 2020 rule changes, so on a UKGC-licensed casino you'll need to land four consecutive tumbles naturally to trigger the free spins round.
Features & Mechanics
The free spins round is where 1 Million Megaways BC earns its name. Once triggered, a seventh reel — the Mammoth reel — is added to the grid alongside the standard six. Like the main reels, it starts small and can expand as tumbles land, but its ceiling is higher: up to nine symbols, compared to seven on a standard reel. With all six main reels locked at seven symbols and the Mammoth reel locked at nine, the maths works out to 7⁶ × 9 = 1,058,841 ways to win — the number the game is named for.
The Lock-it Reels system is the mechanic that gets you there: during free spins, any main reel that reaches seven symbols locks in place for the remainder of the round and permanently adds +1 to that round's win multiplier. If the Mammoth reel itself reaches nine symbols, it locks too and awards five additional free spins on top of whatever's left in the round. Because reels lock independently and stay locked, a free spins round that runs long can build toward the maximum ways-to-win figure and a stacked multiplier at the same time, which is where the game's headline win potential comes from.
A Buy Bonus option exists in the game engine, letting players skip straight to the free spins round for a fixed cost of 50x to 270x their stake, buying between 6 and 14 spins depending on the price paid. That option is switched off for UK players, however — UKGC-licensed casinos don't offer bonus-buy on any slot, so UK players reach the free spins round the same way regardless of stake: by landing four consecutive tumbles naturally.
Volatility & Win Potential
1 Million Megaways BC carries an RTP of up to 96.2% in its default configuration — some operators run alternative configurations at 94% or 88%, so it's worth checking the in-game paytable for the exact figure live at your chosen casino. Volatility is rated high by Iron Dog Studio, in keeping with a mechanic built around a rare, escalating jackpot-style payout rather than frequent smaller wins. The maximum win is 45,000x stake, with bets ranging from £0.20 to £20 per spin — well above the UK stake cap noted earlier. Most sessions will consist of the standard tumbling base game with occasional multiplier boosts; the real upside is reserved for free spins rounds where the Lock-it Reels feature manages to lock several reels at or near their maximum before the round ends.
Pros & Cons
- Pro: A genuinely distinctive Megaways variant — the Mammoth reel and Lock-it Reels combination pushes past the usual 117,649-ways ceiling in a way few other Megaways titles attempt.
- Pro: The tumbling multiplier applies in the base game as well as free spins, so it isn't purely a bonus-round mechanic.
- Pro: the tumbling multiplier and Lock-it Reels mechanic give the base game momentum of its own, even without a way to pay in directly for the bonus round.
- Con: High volatility means long stretches without a bonus round are common — this isn't a slot built for steady, low-variance play.
- Con: Reaching the full 1,058,841-ways configuration requires several reels locking near their maximum, which won't happen on every triggered round.
Final Verdict
1 Million Megaways BC is a solid pick for players who want a Megaways slot built specifically to chase an outsized number rather than one that bolts the mechanic onto an existing theme. The Mammoth reel and Lock-it Reels combination gives the free spins round a genuine sense of building toward something, and the base-game tumbling multiplier means there's some upside even outside the bonus. High volatility and a 45,000x cap mean this plays best as a title for players comfortable with longer dry spells between bigger wins, rather than a low-key, frequent-payout option.
