Boulder Bucks is a Barcrest-powered video slot with 5 reels and 10 paylines. Available to play from 10p to £500 a spin across desktop, mobile and tablet devices, it has a caveman/pre-historic theme with 2 bonus features – you can benefit from 3 different free spins options and a pick me feature.

The game is colourful with dinosaurs, cavemen and cavewomen on the reels – graphically, Boulder Bucks looks fantastic as the cartoon-style imagery is a step up from what you’d find when you watch The Flintstones. Now, the higher the stake you play at, the bigger the potential rewards as the RTP (return to player %) increases – playing under £2 a spin has an RTP of 94% whilst playing above £2 a spin has an RTP of 96%.

If you use the Big Bet Mode (which is found in many other Barcrest slots like Monopoly Big Event), a series of 5 linked spins take place. You have the £20 Big Bet where you can trigger the pick me feature (described below) with the Boulder Bucks symbol only on reels 1 and 3. If you play at £30 Big Bet, you can trigger the feature with 2 Boulder Bucks symbols on 2 of the 3 eligible reels (1, 3 or 5).

On to the features – you have the Egg Pick Me Bonus feature which is played when you see 3 of the dinosaur egg symbols on the reels. Here you will get a simple multiplier of your stake – don’t expect much though.

The main attraction is the Free Spins feature which is triggered when 3 or more Boulder Bucks symbols appear anywhere in view – there are then 3 options which have varying characteristics:

The Mammoth Spins feature rewards you with 20 free spins. Look out for the wild symbol on any of the 3 middle reels which expand to take over the whole reel.

The Pterodactyl Spins feature gives you 10 free spins with the wilds appearing on any of the 3 middle reels. Now, these wilds expand to turn all symbols to the left into additional wild symbols.

The Sabre-Toothed Tiger Spins feature gives you only 6 free spins but you will benefit from persistent expanding wilds. Wilds only appear on the centre 3 reels and expand to turn the whole reel wild. When they appear and expand, they will remain on the reels for the during of the feature – if you were to get 3 wilds on your first free spin, they would expand and remain in place for the remaining 5 free spins (like WMS Gaming’s Black Knight II).

After your chosen free spins feature ends, you can choose to collect your winnings or reject them – rejecting them will give you another chance to hopefully win bigger. However, you can only reject the winnings once.

I really like Boulder Bucks as it’s entertaining, looks superb and has potential wins of up to 500 times your stake on every spin. The variance is somewhere in the middle which offers balanced gameplay. If you fancy a slot that has multiple free spins options and a prehistoric theme, Jurassic Park by Microgaming is highly recommended.