Stampeding wild animals take centre stage in Rumble Rumble, a 5 reel, 100 payline slot powered by Ainsworth. It comes with stacked and expanding wilds as well as a bonus feature that awards 8 free spins on a giant reel set. Play from between £1 and £75 per spin.

Rumble Rumble started life as a live casino slot and the online version keeps that pretty basic formula – visually, it’s nothing to write home about. Set against plain white reel, symbols include lower value playing cards and a series of wild animals associated with the American west. Look out for a moose, a black horse, eagle, prairie dog and rock face. There is also a fire bull and a wild.

Whenever the fire bull appears in a blue edged position on reels 2 or 4, all symbols on that reel will also become wild. If it lands in a red edged position on reel 2, all symbols on reels 1, 2 and 3 will turn wild. If it lands in a red edged position on reel 4, then it’s reels 3, 4 and 5 that will turn wild. Land the fire bull in the red position in both reels 2 and 4, then all reels turn wild!

They’re joined by a coin which is the scatter, awarding payouts of 1, 10 or 100 times your total stake, and a wild coin which appears on reels 1, 3 and 5 only and also substitutes for everything bar the fire bull.

Land 3 or more scatters and you’ll trigger the Free Spins feature which awards an initial haul of 8 free spins. These are played out on a new set of reels which is a massive 9 rows high! The fire bull is in play here too, offering the chance of hitting wild reels. You can re-trigger even more free spins too if you manage to land 2 or more coin scatters during the feature.

Rumble Rumble takes a little getting used to – the red and blue boxes are certainly unusual, especially the way they add the stacked wilds. The standard payouts are pretty small though so even if you do land a full complement of stacked wilds it doesn’t guarantee a big payout.

That said, there’s plenty of action on offer thanks to the 100 paylines and regular stacked wilds. The bonus round spices things up too thanks to the giant reel set. It may not be the prettiest slot you’ll ever see, but you won’t be complaining if Rumble Rumble leads to a stampede of coins.