Dark Vortex

Yggdrasil sets Dark Vortex inside an abandoned fortress, its reels wrapped in stone carvings and drifting mist under a ghostly soundtrack. Originally developed under the working title Dark Portal, the game runs on a five-reel, five-row grid with no fixed paylines: any three or more matching symbols connect for a win in either direction. The base configuration pays across 243 ways, though a mechanic called Vortex Reels can stretch that out to a maximum of 3,125.

Ten regular symbols make up the paytable alongside a wild, two orb symbols and a Vortex symbol. Five spellbook icons cover the low end, while monsters and creatures fill the premium tier; the Red Devil woman pays the most among them, worth 6x the stake for five matching. The wild replaces every symbol except the Vortex and the two orbs, and it only appears on Vortex reels and on reels 2 through 4 during free spins.

Landing five Vortex symbols, one per reel, triggers the free spins outright, but partial hits matter too: two adjacent Vortex symbols open three Vortex Spins, during which a reel converts from three rows to five and the available ways increase accordingly. Every further adjacent Vortex symbol adds another open reel plus two more spins, and an open reel stays active until its own Vortex Spins are used up. Filling all five reels before that happens is what launches the free spins proper, played across a full 5x5 grid worth 3,125 ways.

The two orb types shape how that round plays out. Pink orbs land only on reels 1 and 5, and each one adds a wild to the stack sitting across the three centre reels; blue orbs, confined to reels 2 through 4, each add an extra free spin instead. Because pink orbs are what push the centre reels toward being fully wild, how many appear before the Vortex Spins run their course has a large say in the size of the round.

A Buy-A-Bonus option is also available, priced at 80x the stake, dropping a player straight into the free spins and raising the RTP to 97% compared with 96.5% when the bonus is earned through ordinary play. Betting runs from 0.10 to 50 per spin, volatility is rated medium-to-high, and the maximum win is listed at 7,000x the stake.