Summon up your inner Dick Van Dyke and put on your best rotten cockney accent and celebrate the humble chimney sweep in Chimney Stacks, a 5 reel, 40 payline slot from Bally Technologies. Set against a rooftop backdrop, it comes with free spins and big wilds. Play from between 40p and £500 per spin.

Chimney Stacks comes with a pretty standard set up for a Bally slot. There are 3 high value symbols: the top hat, the bellows and the weather vane. The topper is the biggest payer, 500 times your line bet if you manage to find 5 in a payline.

The trio of chimney related objects are joined by playing card symbols from ace through to nine. There’s also a wild symbol which substitutes for everything apart from the bonus symbol. The visuals are what you’d expect from a Bally offering. There’s nothing flashy on show, but they do the job perfectly well.

The chief attraction in Chimney Stacks is the Free Spins Bonus feature – land 3 bonus symbols anywhere on reels 1, 3 and 5 and you’ll be awarded 10 free spins. All wins during the feature are subject to a 4x multiplier.

Stacked wilds also appear during the feature. If one hits that fills an entire reel, it will be frozen in place for the duration of the bonus feature. The one downside is that it’s not possible to trigger extra free spins during the round.

The concept may be simple but Chimney Stacks is a volatile affair – the variance is high so it’s possible to burn through your money (excuse the pun) if you’re not careful. If you have the bankroll to cope it’s possible to hit some big wins though, especially via the free spins round.

Given how simple both the visuals and the gameplay are, you couldn’t describe Chimney Stack as a classic. There are certainly more exciting and innovative offerings in the Bally catalogue (like Lady Robin Hood). The possibility of hitting a big win make this unusually themed slot worthy of closer examination though.