Thunderstruck II is Microgaming's Norse mythology-themed 243-ways slot and one of the most celebrated online slots of its era. Released in 2010 as the sequel to the original Thunderstruck, it features four Norse gods — Valkyrie, Loki, Odin, and Thor — each associated with a progressively more powerful free spins tier in the Great Hall of Spins bonus system.
The game plays on a 5x3 grid with 243 ways to win. All positions on consecutive reels from left to right participate in wins, eliminating specific paylines in favour of complete reel coverage. The Thunderstruck II logo acts as a wild substituting for all regular symbols, and the Mjolnir (Thor's Hammer) acts as the scatter for the bonus.
The Great Hall of Spins is the defining feature. Like Immortal Romance's Chamber of Spins, it unlocks sequentially: Valkyrie's Level 1 (10 spins, 5x multiplier), Loki's Level 2 (15 spins, wild magic), Odin's Level 3 (20 spins, wild ravens added each spin), and Thor's Level 4 (25 spins, rolling reels with up to 6x multiplier). Each new trigger advances to the next level.
The Wildstorm random base game feature can spontaneously convert 1-5 reels to full wild on any spin, creating maximum-coverage wild events independently of the bonus system.
Thunderstruck II operates at medium volatility with a 96.65% RTP, making it more consistent than high-volatility 243-ways games while rewarding long-term play through the progressive Great Hall of Spins system. Available in full on Maxim88 across all devices.
