Overview of The Hammerstorm slot
Title
Developer
Rating
RTP
96.5%
Daily
95.5%
Weekly
94.5%
Hot
Hammerstorm drops you straight into a thunder-charged Viking world where Thor leads the action with respins, lightning-charged money symbols, and a bonus feature that evolves as you collect modifiers. Pragmatic Play built this one as a fast-paced, collection-driven slot where expanding grids, multiplier-boosted symbols, and extra spins all collide for chaotic but satisfying gameplay.
Hammerstorm uses a familiar setup where special Lightning symbols and Thor himself trigger the game’s core mechanic: Respins. During regular spins, players watch for Red, Green, or Purple Lightning symbols, each tied to one of three modifiers: Double, Expand, or Spins. Landing Thor on reel 1 alongside at least one Lightning symbol guarantees the activation of the respins feature. Once triggered, the game shifts to a 5×5 grid with 5 initial spins, where players collect coins and lightning symbols to expand the bonus area and gain additional respins. The feature continues as long as new symbols land on the grid.
Pragmatic Play leans hard into Norse mythology here—rich valleys, longships resting in harbor, and distant golden architecture meant to evoke Asgard. Snow-capped mountains frame the scene, giving the slot a sweeping, mythic vibe. The presentation is polished and atmospheric, with just enough fantasy flair to keep Thor’s world feeling powerful without overcomplicating the visuals.
Hammerstorm keeps its feature set tight but impactful, with everything built around Lightning symbols and an evolving Respins round.
Three Lightning types (Red, Green, Purple) can appear during base play.
Each is collected by matching chests above the reels, which may randomly trigger a respins round enhanced by 1–3 modifiers.
All Lightning symbols act as money symbols, holding values between 0.5x and 10,000x your bet.
Thor can land only on the far-left reel; if he shows up alongside any Lightning, the respins trigger automatically.
Once activated, respins shift gameplay to a 5×5 board filled with:
Silver or Gold Coins
Silver or Gold Lightning symbols
Blank spaces
Lightning and coin values range from 0.5x to 10,000x, with Gold versions appearing only when the Double modifier is active.
A 2×2 collection zone moves across the board, scooping up values from coins and Lightning symbols. The more Lightning you collect, the larger the zone becomes:
Collect 5 Lightnings → Zone expands to 3×3 (+3 respins)
Then 4 more → Zone expands to 4×4 (+2 respins)
Then 3 more → Zone reaches 5×5 (+1 respin)
Depending on which modifiers triggered, the entire bonus behaves differently:
Double Modifier
Gold Coins and Gold Lightning symbols can appear.
Collecting a Gold symbol awards its displayed value plus a second random value.
The grid expands from 5×5 to 7×7.
The collection zone can grow beyond its normal maximum (up to 7×6).
Each expansion grants additional respins (3, 3, 3, 2, then 1).
Hammerstorm does not include a direct buy-in feature for the respins round. All bonuses are triggered organically through Lightning symbols and Thor’s appearance.
According to Razed Casino Hammerstorm offers the following to players:
Bet Range: $0.20-$240
RTP: 96.50%
Volatility: High
Max Win: 10,000x
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