Thunder Cash is a glitzy, casino themed slot from US developer Ainsworth. Played using a 5 reel, 20 payline game engine, the main attraction here is the bonus round which awards free spins with frozen wilds. Play from between 20p and £2,000 per spin.

With a title like Thunder Cash, you might think that the great American outdoors would be the setting here. Instead, it’s the pit of a brick and mortar casino that forms the backdrop to the reels. Those reels are set against a backdrop of fruit machines and are flanked by a roulette wheel and a poker table.

Symbols on display include lower value A to 10 playing cards. They’re joined by dice and stacks of chips which pay up to 10 times your total stake, a shimmering diamond which awards up to 20 times your total bet and the lucky red 7 which awards 25 times your total bet if you land 5 in a payline. Appearing on reels 2, 3 and 4 only, the lightning bolt casino chip is the game’s wild – it doesn’t offer any pays in its own right but does replace all other symbols apart from the scatter.

The Thunder Cash logo is the scatter – it’s by far the most potentially lucrative symbol on display here. Land 3, 4 or 5 of them on the same spin and you’ll pocket an award equal to 5, 10 or 100 times your total bet. You’ll also activate the Free Games feature.

Once triggered, you’ll be awarded 8 free spins. Boosting your winning chances here is the presence of sticky wilds. Whenever a wild lands, it will remain locked in position for the remainder of the free spins. You can add to your tally of free spins too – 3 or more scatters on the same spin adds an extra 5 free spins to your total.

Like many Ainsworth slots, Thunder Cash has the look and sound of a life casino slot – it’s loud, brash and flashy, on the surface at least. We didn’t find the gameplay all that exciting though – yes, we managed to land the free spins often. The paytable in the free spins are lower than in the base game. Even when we filled the middle 3 reels with wilds, we still won less than 40 times our stake.

Thunder Cash is a pretty basic affair both in terms of design and features and despite all the bells and whistles we found it a little underwhelming overall. If sticky wilds are your thing, WMS’ Black Knight II offers you up to 3 sticky wild reels in its feature!