Hammerstorm

Hammerstorm is a Viking-inspired casino slot from Pragmatic Play built around a 5x5 grid and collecting red, green, and purple lightning symbols. The game includes a demo version, allowing players to play for free and practice before playing for real money. A random trigger can launch the Respins feature, starting with 5 respins and placing a moving 2x2 collection zone on the reels.

During respins, coin and lightning symbols can land with values reaching up to 10,000x. As lightning symbols are collected, the zone expands from 2x2 to 3x3, 4x4, and 5x5 after 5, 4, and 3 symbols, with extra respins awarded at each stage. The feature may also include up to three modifiers: Double, which adds gold versions of coin and lightning symbols collected twice; Expand, which grows the grid to 7x7; and Spins, which adds +1 Spin symbols to the reels.

The Respins feature can also begin when the Thor symbol lands on reel one alongside at least one lightning symbol anywhere else on the grid. This slot review covers the main mechanics, symbols, and bonus game structure for players looking for a Hammerstorm slot demo and a free way to learn how the features work.