Above the reels, players will see the maximum ay outs on show for the highest four symbols and these amounts can be won by filling the entire screen with one of these symbols. The four most valuable symbols are the diamond, 7, bell and bar and these can also appear stacked on the reels to provide even bigger winnings. If players are lucky enough to have their reels stop and all of the symbols show the same stacked symbol the double stacks feature is activated and comes into play. All the symbols shown double meaning that all symbols count as two as opposed to one. The upshot of this is that players can then be rewarded with 10 of a kind win combinations therefore if the player were able to land 10 double diamonds they are rewarded with a massive 1,000 times their stake. Double Stacks also offers a free spins feature where there are up to 60 free spins on offer and the feature is activated when players land three or more scatters anywhere on the reels.
The scatters award players with 5, 15 or 30 free spins when 3, 4 or 5 scatter disco balls are landed respectively. Whilst playing this feature players also have the chance for the wild to appear on any of the reels or even better staked on any reels not forgetting the four highest value symbols that can come into play. Thanks to these added elements it makes it far easier for players to fill their reels with any one particular symbols, however, better still is that the free spins feature is triggered by as few as two scatters. Double Stacks has a medium variance with up to x1,000 times the players stake available to win on every spin and each free spin, both achieved by landing full reels of the double diamond symbol or using the diamond symbol coupled with the wild in the free spins.
There are many good things on offer with this slot, the visuals are excellent, and the soundtrack is amongst some of the best I have heard in a very long time. The game play is smooth and whilst I assumed that the x1,000 potential winnings was the maximum on offer this is actually the maximum win per spin giving players decent potential to win. Personally, I feel that this is one of the best slots to come from NetEnt in quite a while and thanks to the features and win potential it is sure to be amongst the most popular slot releases.