The game can be played from as little as 0.40 up to 40 per spin, and it's accessible from any device. All winning combos are rewarded from left to right over 40 pay lines in a 5x4 grid. The standard A through 10 royals make up the lower paying symbols on the reels, while the next four high pay symbols offer payouts of between 1.875x and 6.25x the wager for a line of five of a kind. The wild card is represented by Thor's hammer. If it appears on all 5 reels, it can substitute for any of the standard symbols. As a bonus, it causes a Colossal Respin.
When any wild symbol appears on the screen, Colossal Respins are activated. Large icons will appear on the first and second reels. If you get another wild during the respin, the giant symbol will grow to cover an extra reel and you'll get another respin. Reaching a fourth respin gives a 2x multiplier, which rises by +1 for each wild-triggered respin.
Mystery spins occur randomly in the base game and fill at least three reels with Mystery symbols. The mystery symbols combine to form the same symbol.
When you get six or more Cash Shield symbols anywhere on the reels, the Hold & Win feature is activated. The game will display a different set of reels, but the initial symbols will remain the same. These new reels may have additional cash or unique shields. Each new shield resets the player's initial three respins.
During the Hold & Win respins mode, players can win Thunderstorm prizes by collecting three Storm Shields. These are the Mini, Major, and Mega, valued 10x, 100x, and 1,000x the stake, respectively. Thunderstorm Prizes are randomly granted after three storm shields land during Hold & Win Respins.