Thunderhorn may sound like a programme you’d stumble across at the fruitier end of the Sky TV channels but it is in fact a safari-themed slot from Bally Technologies. Set in the African savannah, it’s a 5 reel, 1,024 ways to win title that comes with free spins and big multipliers. Join the action from between 40p and £640 per spin.

The Thunderhorn in question is course the mighty rhino which is the biggest paying symbol offering 300 coins if you find 5 in a payline. Joining the rhino on the reels are the leopard, face mask, drum and dish as well as Bally’s standard playing cards. The tree is the wild symbol – it appears on reels 2, 3 and 4 and substitutes for all symbols apart from the bonus scatter.

That bonus scatter is the key to triggering the Free Spins feature – three bonuses will give you 8 free spins, four will provide 15 free spins with five bonuses offering 20 free spins. There are plenty of extras on offer during the feature too.

If the wild symbol lands anywhere on reels 2, 3 or 4 it will multiply that spin by 2x or 3x. These really come into their own if more than one of them appear at the same time as the multiplier will be combined. Find a 2x multiplier and a 3x multiplier on the same spin and the winning paylines will be boosted by 6x.

It’s possible to re-trigger the free spins. Two bonuses will give you 5 extra free spins, three offers 8 free spins and four gives 15 extras. Find five and you’ll receive 20 bonus games – that’s a total of 40 free spins available. As for the feature, it’s played out to a thumping African style soundtrack.

The African plains can be dangerous territory for the unwary traveller and the same goes for Thunderhorn which is a high variance slot. It’s possible to fly through your bankroll in rapid fashion so some caution is required. Expect some dry spells in between the wins. When those wins do come along they can be very large though, especially if you manage to combine the multipliers during the free spins.

The base game may not be the most exciting around but the Free Spins feature can certainly make up for it. If your luck is in, these big beasts can deliver some potentially mighty payouts. It reminds me a lot of WMS Gaming’s Raging Rhino which has a similar theme, is highly volatile and has a very similar free spins feature!