Thor Infinity Reels

Thor Infinity Reels is a Norse mythology slot from Yggdrasil, built around the Infinity Reels mechanic that keeps expanding the grid as wins keep landing. The game opens on a compact 3x4 layout, but there's nothing static about it — reels can keep growing for as long as the winning streak holds.

Set in a stormy vision of Asgard, the game surrounds its reels with divine temples, glowing runes and a turbulent sky, while Thor himself looms over proceedings, hammer in hand. Symbols draw from the same well of Norse iconography — hammers, ravens, warriors and mythical relics — rendered with dramatic reel-expansion animations and lightning-strike effects that fire off whenever the multiplier climbs.

The core mechanic is straightforward once you see it in action: wins form from matching symbols landing on adjacent reels starting from the left, and every winning combination that touches the rightmost reel adds a brand new reel to the right of the grid, pushing a running multiplier up by +1 with no cap in sight. Thor acts as the game's wild, substituting into combinations to help extend a winning run even further. Landing six or more Mjölnir hammer scatters triggers the Jackpot Streak Respins bonus, which opens with 3 respins that reset whenever a new cash or jackpot hammer lands — and those hammers are sticky, so they accumulate as the feature plays out. Four tiered jackpots sit behind the hammers (Green at 10x, Blue at 50x, Red at 250x, and Gold at 2,000x), while reaching 12 or more reels unlocks an Infinity Bonus worth 888x on its own.

On the numbers, Thor Infinity Reels carries a 96.2% RTP, comfortably inside the range most players would call fair, and high volatility that fits the escalating-multiplier design — the longer a chain of wins runs, the more dramatic the payout gets. The confirmed maximum win sits at 6,055x the stake, achievable when the reels keep expanding and the jackpot hammers stack up during the respin feature. Stakes run from 20p/c up to $/€40 per spin, giving room to scale the bet to whatever the reel expansion demands.

Because the reel count itself is a moving target rather than a fixed grid, hit frequency is harder to pin down than on a standard slot — expect variance session to session as some spins fizzle out after one reel while others snowball into an extended run. That unpredictability is really the whole appeal of the Infinity Reels format.

If the idea of a grid that keeps growing while a multiplier climbs alongside it sounds like your kind of thunder, Thor Infinity Reels is worth a look. The free demo at johnessyslots is the easiest way to watch a few reel expansions play out and get a feel for how quickly the Jackpot Streak Respins can snowball before playing with real stakes.