Hammerstorm

Red, green, and purple lightning symbols are collected by the Double, Expand, or Spins chests above the reels. Randomly, any of the three gems can trigger the Respins feature with 5 respins.

During the feature, coin and lightning symbols with values up to 10,000x can hit. On each respin, a 2×2 zone appears on a random position on the grid, collecting any coin or lightning symbols that land within it. After collecting 5, 4, and then 3 lightning symbols, the zone expands to 3×3, 4×4, and 5×5, respectively, as well as awarding 3, 2, and 1 additional respins.

One or several modifiers can be active during the feature. Double adds a gold version of the coin and lightning symbols, which are collected twice, Expand increases the size of the grid from 5×5 to 7×7, and Spins adds a +1 Spin symbol to the reels.

The feature can also be triggered by landing the Thor symbol on reel one and at least one lightning symbol anywhere else on the grid.