Hall of the Mountain King is a fantasy-themed slot from Quickspin that centers on Wild Symbol, Expanding Wilds, and Free Spins. The presentation leans into a mythic fortress setting with Nordic motifs, dark stone textures, and stylized rune accents. The fantasy theme extends to artwork, character motifs, and a soundtrack intended to convey an epic, mythic vibe. Sound design supports the atmosphere with orchestral motifs and metallic textures.

Mechanically, the game uses Scatter Symbol triggers that can unlock features, Wild Symbol substitutions for nearby wins, Expanding Wilds that grow to cover positions, and Free Spins with potential re-triggers. A Multiplier element is part of the feature set, adding a quantitative twist to certain spins. The feature set appears to favor triggering via scatter interactions, with visuals indicating expanding Wilds over the reels.

The grid is described in terms of its core layout and payout structure. Betting limits, return, and win potential are disclosed in the concluding spec. The full numeric specification is: 5 reels, 20 paylines; minimum bet USD 0.2, maximum bet USD 100; RTP 96%, top win x59, volatility medium.