10000 BC DoubleMax

This Yggdrasil-hosted release of 10000 BC DoubleMax brings 4ThePlayer's original GigaBlox-and-DoubleMax mashup to the wider Yggdrasil network, running on a 5-reel, 5-row grid with 50 fixed paylines and the same core cascading structure that made the original a talking point when it launched.

How the mechanics interact

The mechanical backbone here is straightforward but powerful: every win triggers a cascade, clearing the symbols involved and dropping new ones into the vacated spaces, and each successive cascade doubles the active DoubleMax multiplier. GigaBlox symbols, oversized blocks that can merge across multiple positions on the grid, appear regularly throughout play, and when a GigaBlox lands alongside an escalating DoubleMax multiplier, the resulting win can jump considerably compared with a standard cascade. Two random features, Mammoth Explode and Mammoth Shuffle, can also trigger on otherwise losing spins, each designed to manufacture a guaranteed win rather than leaving the reels to reset with nothing to show for it.

Thematically, expect a frozen prehistoric world of woolly mammoths, sabre-tooth tigers, snow-laden landscapes and ancient cave imagery, animated with a fair bit of weight and impact whenever a cascade chain or GigaBlox placement fires off.

Free Spins and bonus buy

Free Spins trigger once three or more scatter symbols land, awarding a variable number of spins during which the DoubleMax multiplier continues climbing without resetting, giving free spins rounds a genuinely different character to the base game, a real chance for the multiplier to compound significantly if cascades keep chaining. A bonus buy option is also available on supported platforms, instantly triggering the free spins round with every core mechanic remaining fully active.

RTP, volatility and stakes

On the numbers, this listing carries an RTP of 96.0% and high volatility, with betting running from 0.1 up to 10 per spin, an accessible range given the mechanical firepower on offer, and a maximum win of 10,000x the stake, achievable specifically through extended GigaBlox and DoubleMax interaction during a strong free spins run.

Verdict

Whether encountered through Yggdrasil's platform or 4ThePlayer's own catalogue, this is fundamentally the same ambitious pairing of two heavyweight mechanics in one game, and it remains one of the more mechanically dense prehistoric slots on the market as a result.

Fancy watching GigaBlox and DoubleMax combine for yourself? The free demo at johnessyslots is the easiest way to trigger both mechanics together and see how the multiplier builds through a cascade chain before deciding whether to chase the 10,000x ceiling with real stakes.