Oxygen is the latest in a long line of modern grid slots and therefore abides by the Cluster Pays system. In this game, you'll need a group of five matching symbols to land anywhere on the reels but they must be touching horizontally or vertically.
The lowest-paying symbols are the three coloured gems and you'll need quite a lot of these to see any profit from your stake; 14 or more will do the trick. Moving up the ranks, we find 3 ugly-looking fish and a diver's helmet in which an octopus is hiding. This final symbol can produce up to 100x for 14+ matching symbols. There are also big symbols available with a 4x4 giant symbol being the biggest that can land. The beauty of these is that you are already on your way to a fabulous win and if they connect with other matching symbols, then that win just gets better.
Winning symbols are removed, as is the tradition with the Avalanche after a Cluster Pays combo and new symbols will drop into place. The excitement starts to pick up at this point as multiplier spaces are left behind when winning symbols disappear. Land another win on one of these places during the same winning sequence and that multiplier keeps on doubling.
Multiplier Modifiers & Bonuses
Multipliers can receive some fantastic modifying additions with the Collector drawing together any other multiplier figures on the screen and creating a big win. And the Dealer will multiply other multiplier values in a ‘V’ shape. Both of the above can be persistent.
Wild symbols come in three formats and these are X-Blaster Wilds, Exploding Wilds and regular Wilds. Regular Wild symbols need no introduction but the X-Blaster Wild and Exploding Wild are a little different. X-Blasters will replace a selection of random symbols in an ‘X’ shape and the Exploding Wild will blow up all payout symbols within an ‘X’ shape area above and below itself.
Players in the UK will be able to experience the regular Bonus game with 10 free spins available and multipliers now sticking around throughout the spins. It's also possible to see persistent multiplier modifiers but they aren't guaranteed. For this privilege, you will have to be in an area that allows you to pay a hefty 500x your stake and in this instance, still only 10 plays are available but one of the multiplier modifiers will be guaranteed. This is quite a big gamble to take.
The other buy in option is to pay 100x for the regular Bonus game. This is all part of the X-iter feature which also gives players the chance to pay 25x for a persistent multiplier and 2x to see a multiplier strike where a random number of multipliers are added to the reel. Finally, there’s triple the chance to trigger the Bonus game with the Bonus Hunt option which will cost 3x.