Dwarf Mine

Yggdrasil built Dwarf Mine around a five-reel grid that opens at 1,024 ways to win and expands as the game progresses, eventually reaching 16,807 ways once every row has grown to its full height. The setting is a mine shaft worked by a lone, Irish-accented dwarf who stands beside a hydraulic rig, hauling the lever up and down as the reel set rises and falls around him — cartoon-style art with plenty of movement, and a backdrop that hides a leprechaun hat and the remains of buried dinosaurs among the rock.

Card-suit symbols make up the low end of the paytable, while dwarven tools carry the premium payouts: shovels, axes, helmets and lanterns, with the lantern the most valuable of the four at 1.4x the stake on a payline. There is no wild in this game — Yggdrasil left it out deliberately — so the bonus symbol carries the weight of the feature side instead, doing double duty as both the trigger for free spins and the mechanism that expands the reels in the base game. Each bonus symbol that lands adds a row, and the grid can grow by up to three extra rows before it maxes out at 16,807 ways.

Landing three bonus symbols on reels one, three and five opens Dwarf Mine's standard bonus: 10 free spins played on a reel set that's already fully expanded to the maximum ways count. A second route runs through the base game itself — as rows expand, they can reveal green, yellow, blue or red crystals, and collecting five of a matching colour triggers 5 Collection Free Spins instead. That shorter round trades spin count for a set of four high-value crystal symbols exclusive to it, with five red crystals worth 4x the stake; none of the four crystal types appears fully stacked, so a full screen of a single symbol isn't possible even inside this feature.

Yggdrasil rates the game medium volatility at 5.5 out of 10, with a 96.8% RTP, hit frequency of 20.67% and a maximum win of 3,904x the stake. Stakes on Dwarf Mine run from 0.10 up to 125 per spin. With the ways expansion built into ordinary play rather than locked behind a bonus, the reel set keeps building toward its ceiling between the two free spins routes.