1 Million Megaways BC

Iron Dog Studio sets 1 Million Megaways BC in a snowbound prehistoric landscape, complete with a cave mouth, frost-laced trees and rocks, and a tribal drumbeat carried by a full orchestral arrangement - closer to an animated ice-age epic than a typical Megaways release.

The base game runs on six reels holding between two and seven symbols apiece, so the ways to win shift every spin, ranging from 64 up to 117,649. Wins trigger a tumble: cleared symbols are replaced by new ones dropping into the gaps, and each further tumble in a run pushes a multiplier that climbs by two per step, capping at x8 in the base game.

Cavemen, cavewomen, mammoths, sabretooth tigers and deer make up the premium symbols, paying between 2x and 10x for seven of a kind, while royal card values fill out the low end and drop off sharply once all six reels are active. An ice-bound wild lands on reels two through seven and substitutes for any paying symbol.

Reach four or more tumbles in a row and the game hands out 8 free spins, adding two more for every additional tumble, up to a cap of 14. Free spins bolt on a seventh position - the Mammoth reel, capable of holding nine symbols - which pushes the maximum ways figure to 1,058,841. Any regular reel that fills to seven symbols locks in place for the rest of the round and adds a flat +1 to the multiplier; the Mammoth reel does the same at nine symbols while also handing out five extra spins. That reel can also collect sticky wilds that stay put until the round ends, and the multiplier keeps climbing on tumbles without resetting after a blank spin. Iron Dog also sells entry to the round directly: buying between 6 and 14 free spins costs 50x to 270x the stake, with no option to pre-lock reels.

Stake sizes range from 0.20 to 20 per spin. RTP lands at 96.2% against high volatility, with a published ceiling of 45,000x the stake. On its own, the base game plays out fairly quietly, with the multiplier rarely reaching its top end before a win breaks the chain - it's the free spin round, once the Mammoth reel starts filling and locking, where the reel count and multiplier both have room to compound into the bigger results.