Free Oxygen slot
Oxygen free play demo
To play the free demo, click the button, the game may take some time to load.
Oxygen slot by Elk Studios is another cluster-pays X-iter mechanic game as it seems 3/4 of their recent editions are. This began way back with Nitropolis 3 slot and the many since include Coba Reborn and Pheonix Graveyard slot. Your theme is monsters and bubbles here and the pays are made for 5+ adjacent symbols, the maximum being 14+ which pays 100 down to 10x. Winning symbols are replaced via tumbles and colossal tiles of 2x2 to 4x4 can land along with Wilds and scatters.
There's a normal Wild, an exploding one which removes symbols from an X-shape with it being the centre position and X-blaster Wild which selects a random symbol or Wild and replaces all symbols in an X-shape with the Wild at the centre. If any position is affected by 2 X-blasters when those positions go Wild. Another thing to look out for is the multiplier which starts at 2x the first time a position within a spin is used in a winning cluster, if used again it goes to 4x, then 8x and so-on before resetting after the spin. There's 2 multiplier features possible as well - a Collector Spiral which collects all multipliers in view and adds them and can be persistent. A Dealer spiral multiplies all multiplier values in view by a fixed amount and this can also be persistent. Finally a Multiplier Drop can occur and place a random amount of multipliers on the grid. The maximum multiplier allowed in the game is 2048x.
Free Games of Oxygen slot
You can trigger a standard bonus of 10 free falls with 3 bonus scatters or a Super Bonus with 3 scatters plus one of the multiplier features in play on the triggering spin. In the Super Bonus the triggering multiplier feature is persistent in the round. In both cases multiplier positions earned are sticky between rounds so they double if used and remain in place. You can get +3 drops for two scatters and +5 for 3.
Oxygen slot has a RTP of 94.00% and no bonus buys. It's high in volatility with a maximum win capped at 25,000x bet.