Loki’s Riches Slot by Pragmatic Play

One mechanic carries this entire game: the Special Expanding Symbol. A random pay symbol gets selected on certain spins and behaves differently from everything else on the 7x7 grid. While normal winning clusters explode and tumble away, the expanding symbol stays put. After all cascades resolve, it grows into a 2x2 block - right and down by default, though it flips direction near grid edges.

In the base game, the expanding symbol triggers randomly and lasts for a single spin cycle. During free spins, it becomes persistent - one symbol type is chosen at the start and remains the expanding symbol for all 10 spins. That means every tumble chain that includes the chosen symbol leaves behind 2x2 anchors that accumulate across the round, building toward massive connected clusters.

Four scatters award 10 free spins, with additional scatters adding more. The buy option at 100x provides instant access. Loki himself is the highest-paying symbol on the paytable - landing 25 or more of him in a single connected cluster hits the 10,000x ceiling.

The grid fills with Norse artifacts (hammers, shields, rings, a compass) alongside colored gemstones, all set against an aurora borealis backdrop. The expanding mechanic is the only real feature beyond basic tumbles, which makes the game feel one-note during base play. But when the right symbol gets chosen in free spins and the 2x2 blocks start chaining together, the payoff potential ramps up fast.