The game is played on a retro 5x3 reel set that resembles traditional slot machines, and all the most popular classic symbols are here. There are 10 fixed paylines so your only choice is to decide how much do you want to bet per spin. The minimum bet is €0.10 while the maximum is €100. Main game and paytable The paytable is excellent, as is expected from this type of game. Land five Red Sevens and you'll win 50x your total bet, and Blue Sevens, Diamonds and Bells won't pay much worse either. Even when you descend down to card suit symbols you'll still be able to get a decent prize, provided you get a four- or five-of-a-kind win. You can get up to 10x your bet, which is excellent for card symbols. Wild is the best-paying symbol in the game as you'll get 100x your bet if you land all five. Bonus features Multiplier Wild symbols appear anywhere on the reels, and if only one Wild is part of your winning combination, then there's no win multiplier. If two Wilds are part of the winning combination then the multiplier is x2, and it can also be x3, x4 and x5 when you land that number of Wilds. Three Bonus Scatter symbols on reels 2, 3 and 4 activate the Prime Zone Bonus that will give you 7 free spins, and you'll be able to choose one of four features on offer. The choice is basically where will the Prime Zone be. The Prime Zone consists of three consecutive reels, and on each spin one Wild will be placed on each reel for a total of three. If your Prime Zone will be on reels 1-2-3 then there's no win multiplier. If the Prime Zone is on reels 2-3-4 then you get a x2 win multiplier on all wins, and if the Zone is on reels 3-4-5 then you'll get a x3 win multiplier but the wins will be rare. The fourth mode is a shifting Prime Zone, and the multiplier also varies between x1 and x4 on every spin. This is the only way to get a x4 win multiplier and is therefore likely the best of the four choices, though you can experiment with every one of them to find the one that produces the best results within 7 spins. Prime Zone Slots RTP Theoretical return to player (RTP) is 96.28% and this is a good thing, since slots that offer this kind of a potential to win big usually resort to a much lower RTP. This is a RTP value that fans of the classic slot machine genre should be particularly happy with. Now they can play a game with their favorite symbols such as Sevens and Bells, and get a high RTP as well as a chance to win big. Variance is high as it has to be with this type of game, but not incredibly high. This game can be played by any player, not only those that are experienced with high variance slots. Conclusion Prime Zone is a quality slot game that has high variance and has the potential to pay really large wins, because of the rewarding paytable that's further enhanced by the win multipliers and lots of Wilds during the free spins bonus round. There's no element missing from this slot game, and it deserves to be played for real money. Find it in Quickspin casinos.