Introduction to Hammerstorm
Hammerstorm is a casino slot from Pragmatic Play, taking you on another expedition to the North to visit uncharted landscapes and find chests bursting with ancient treasures. With a title like that, you may already anticipate who and what will be your guide during this journey. Thor and his Mjölnir will move heaven and Earth for you by striking multicolored lightning at the grid for a chance to trigger a respin round with up to 3 active modifiers. Once the divine powers let you cross the threshold between the plane of mortals and the realm of gods, you'll rely on Thor's ability to grow as he keeps collecting lightning and cash prizes. Witness his ultimate form as a 7x6 giant hot zone covering the majority of the panel for a mythological bonanza of rewards.
Ancient deities are unpredictable and fickle beings, so to better prepare yourself for the encounter with Thor, try the demo mode available at the top of this page.
Theme, Gameplay & Payouts
Hammerstorm is a video slot from Pragmatic Play with 5 reels, 3 rows, and 40 paylines. You can choose their stake from a range of options, starting from a Min.bet of 0.2, which makes the game quite affordable, up to a Max.bet of 240, suitable for high-rollers. This value can grow even further with the use of Ante Bet options, up to 12,000 per spin. The math offers a default RTP of 96.50%, with two lower variants of 95.50% and 94.50% also released for the operators, so be sure to keep an eye on what version you're playing. Because of the highly volatile profile, the distribution of wins delivers more valuable hits less often. You will experience a base hit frequency of 26.52%, with a max win of 10,000x the bet achievable at an average rate of 1 in 1,581,540 spins. It takes roughly 102 spins to trigger the bonus round.
The game's main stage is set on a cartoony landscape, showing open spaces, mountains, and signs of a small Viking settlement in the form of several little huts. It seems like more citizens are about to arrive, given the traditional longship approaching the shores. The view is colorful, pleasant, and resembles a design you can find in village-building mobile games. Most decorations carry a classic Viking style made of straight angles and sturdy, solid materials, emphasizing the scene's Norse mythological atmosphere. Thanks to the responsive, optimized setup, the game can be played on a wide range of modern devices, from desktops to smartphones and tablets.
In the paytable, two distinct sets of symbols are responsible for awarding wins whenever at least 3 matching ones settle on an active payline while using neighboring reels, starting from the left side of the panel. Among the low-paying icons, you'll recognize traditional royals from playing cards, including J, Q, K, and A, awarding 1x the bet for aligning 5 on a payline. A war horn, a pair of gauntlets, a horned helmet, an axe, and a shield represent the high-paying symbols, delivering payouts worth 1.75x the bet for a complete 5-of-a-kind combination. Alongside regular icons, there are also Wilds represented by the hammer Mjolnir, Lightning symbols in three different colors, and Scatters appearing as the image of Thor.
Special Features & Slot Mechanics
What is the max win in the slot Hammerstorm?
You can win up to 10,000x the bet.
What features are available in the slot Hammerstorm?
The features are Wild Symbol, Lightning Symbols, Respins, and Ante Bet.
Wild Symbol
Mjolnir, surrounded by lightning, acts as the Wild symbol and substitutes for all regular icons when a payline win is evaluated. Additionally, forming a 3, 4, or 5-of-a-kind sequence consisting of only Wilds awards 2x, 5x, or 50x the bet, respectively.
Lightning Symbols
Red, green, and purple Lightning symbols are collected in the chest glowing with a matching color. Every time a Lightning symbol is collected, there's a chance that the bonus round with a unique feature will be triggered. Landing a Thor Scatter at the same time as Lightning symbols also triggers the bonus with the respective features active.
Red Lightning (Double) = enables Gold versions of Coin and Lightning symbols, which award two consecutive prizes when collected.
Green Lightning (Expand) = expands the grid during the bonus round to 7x7, allowing the collection zone to grow to 7x6 at maximum.
Purple Lightning (Spins) = adds a +1 Spin reward to Lightning symbols, which awards 1 extra spin when collected.
Respins
The bonus round starts with 5 respins on a 5x5 grid and any features that were activated during the triggering spin by the present Lightning symbols. During the game, only blanks, Coin, and Lightning symbols may appear on the reels.
Coins = award instant prizes ranging from 0.5x to 10,000x the bet.
Lightning = award instant prizes ranging from 0.5x to 10,000x the bet, +1 Spin when the respective modifier is active, and they charge the meter.
A 2x2 zone is placed in a random position at the beginning of the round, and it may move to a different spot on every spin. Once charges from collected Lightning symbols fill the meter, the zone grows in size to a maximum of 5x5, or 7x6 if the Expand modifier is active. Each time the meter is filled, 3, 3, 3, 2, and 1 extra spins are awarded.
Ante Bet
To help you reach the bonus round faster, the game offers two Ante Bet options.
25x = guarantees the Scatter Thor symbol on reel 1.
50x = guarantees at least 5 Lightning symbols on random reels.
Final Thoughts on Hammerstorm
Hammerstorm is a game that initially looks like your average slot with a fine but rather unimpressive design, carrying generic Norse imagery and atmosphere. However, once you dive a bit deeper into it, it becomes more and more peculiar, especially because of an unusually 'rocky' soundtrack that becomes even more intense during the bonus round, where it's additionally boosted by a collection of retro electronic sounds intertwined with Thor's occasional lines. Altogether, the respin session feels much like an old-school video game, the ones that the 90s kids played in obscure arcade salons. It's undoubtedly a strange feeling to see a slot like this in 2025, but it does evoke a spark of nostalgia with this audiovisual package.
Gameplay-wise, well, you shouldn't expect any fireworks in the base stage, given there are no modifiers there to boost your occasional payline wins. So, your only hope for some action is either breaking one of the treasure chests or landing a Lightning symbol together with Thor on the first reel to activate the bonus. The round itself is a Hold&Win-style session with a twist, but not one that hasn't been done before. Instead of locking cash symbols on the grid, you'll rely on Thor roaming around the board and collecting them in his zone. Given that the active field can increase all the way up to 5x5 in regular circumstances and 7x6 in the round enhanced by the Expand feature, the possibilities are clear. Prizes themselves are also pretty attractive, since landing even one Coin or Lightning may bring the max win of 10,000x the bet. There's nothing massively inventive about this config, but we must admit the moving zone keeps things more lively than in the traditional Hold&Win format.
Hammerstorm offers a strange mix of Norse mythology and arcade vibes with its audiovisual package and an alternative Hold&Win bonus with 3 potential boosters.
