The visuals in Gem Heat are pretty classic - set against a flame-filled backdrop, the plain black reels include single, double and treble bars, blue, red and green 7s (which can fill 2 positions) as well as a horse shoe, golden $ and a pile of gold bars. Land 5 of the gold bars symbol on a payline for a 1,000 coin payout.
The shimmering diamond is the wild - it replaces all other symbols apart from the scatter. Land just two of them and you'll create a winning combination. Land a full 5 on a payline and you'll pocket 3,000 coins.
The Gem Heat logo is the scatter - it's also the key to unlocking the game's Free Games feature. The range of extras may not be wide but what's on offer is high class. Land 3, 4 or 5 Gem Heat logos anywhere on the reels and you'll win 3, 10 or 100 times your stake as well as being awarded 10 free spins.
Those free spins come with a couple of tidy little extras that can prove extremely lucrative. On each free spin, the diamond wild will be locked in place in the central position of the middle reel.
Also helping things on their way is an expanding multiplier - this starts at 2x and increases by 1 after every second free spin. By the time you reach free spins numbers 9 and 10, your payouts will be boosted by 6x! The only downside here is that the free spins cannot be re-triggered.
Gem Heat is a simple game but a catchy one - the visuals have a glossy feel while the soundtrack is reminiscent of an old school fruity. This game is all about the feature - combine the frozen wild with the big multipliers and you can quickly earn serious amounts of coin.
We'd put the variance in the medium range. It can take a while to trigger but get lucky with the feature and Gem Heat can indeed be a little scorcher. Saying that, other Playtech slot games use the increasing multiplier including Age of the Gods King of Olympus which looks better in my opinion and also has a progressive jackpot element.