Have a glimpse into the future in Extreme, a space age take on a classic fruit machine. This 5 reel, 20 payline game comes with expanding wilds, a bonus feature that awards up to 60 free spins as well as wild multipliers that can boost your payouts by up to 15x. Play from between 20p and £50 per spin.

Set against a star-filled, deep space backdrop, the reels include a range of coloured orbs and gemstone symbols (and no playing cards!). They’re joined by a lucky 7 and cherries encased in ice. The latter is the top paying symbol, awarding 500 coins if you manage to land 5 in a row.

The pale blue cube is the game’s wild – it only appears on reel 3. When it does land though, it drops down to the bottom of the reel and 2 more wilds are dropped on top (in effect it’s an expanding, stacked wild). The cube also awards free spins when it is visible on the reels, dropping 1 position after each free spin.

Look out too for the question mark encased in ice on reels 2 and 4 – this is a wild multiplier. Whenever it makes up part of a winning combination in the base game, that payout will be boosted by a 2x, 3x, 4x, 5x or 7x multiplier. If 2 multiplier cubes form part of the same winning combo, the multipliers are added together.

Things improve still further on the multiplier front in the Free Spins feature. To trigger it, you’ll have to land 3 or more of the flaming key bonus scatter. You’ll then be awarded 10, 20 or 30 free spins depending on how many scatters triggered the feature.

The wild multipliers are once again in play, only this time the numbers are even bigger. They start at 5x and increase to 15x if you get really lucky. You can re-trigger even more free spins here too with 60 possible.

The sound and visuals in Extreme are well done – the space age graphics are clear and crisp with the action playing out to a medley of futuristic, electro style bangs and bleeps. It all works rather well.

It’s a similar story with the gameplay which is simple but very well done. As you’d imagine from a slot called Extreme, the variance here is pretty high. Expect plenty of spells where you’ll win precious little. Trigger the free spins round and hit more than 1 wild multiplier on a single winning line and the results can be spectacular. We managed to win over 180 times our stake after landing a 15x boost in the free spins.

Offering simple, futuristic, volatile action, Extreme is a slot that lives up to its name in more ways than one. If you like futuristic space themed games, NetEnt’s Starburst is one of the most popular online slots around.