Crystal Clear is a nicely designed, gemstone-themed slot from Realistic Games. Featuring a simple 5 reel, 10 payline game engine, it comes with a re-spin extra where new wilds are added to the reels. Play on your desktop, tablet or mobile device from between 10p and £100 per spin.

Visually, Crystal Clear lives up to its name as the imagery is super sharp. Set against a palm tree-lined tropical beachfront at night, the reels include yellow, orange, green, purple, blue and red gemstone symbols. Both of the latter 2 pay 32 coins if you manage to land 5 on a payline.

Those figures are dwarfed by what’s on offer from the white diamond which is the game’s wild – it substitutes for all the other gemstones and offers payouts of 8, 32 or 1,000 times your line bet if you land 3, 4 or 5 in combination.

You’ll notice a number beneath each of the reels – this indicates how many wilds are spinning around that reel on that spin. There will always be at least 8 of them but there is scope to add more. Whenever you land a winner, any non-wilds that form part of the successful combination are changed to wilds. This is known as the Crystal Clear Bonus Spins feature.

You’ll then be awarded a re-spin with the extra wilds added. You can see how many wilds are in play by looking at the meter below the reels. The re-spins (and extra wilds) keep on coming as long as there’s a new winning combination on show. Get on a roll here with the extra wilds and some decent winning chances are on offer.

The wilds revert back to their usual tally of 8 on each reel following a winless spin. Manage to fill all 5 reels with wilds and you’ll pocket the jackpot prize of some 10,000 coins or 1,000 times your stake!

Crystal Clear is a super simple slot – there are no other bonus features or even multipliers. All the action comes from the re-spins with the added wilds. This isn’t a slot for fans of back story or a wide range of features. For simple, well designed, hypnotic play though, Crystal Clear is just the job. If you want a game based on gemstones, IGT’s Da Vinci Diamonds is recommended.