Oxygen 2 by ELK Studios is a 6x7 online slot set in an underwater, science-fiction style world. The game uses a cascade mechanic, where winning symbols disappear and are replaced by new ones, with Oxygen Bubbles adding multipliers to selected positions. The format is designed for demo version play, allowing users to play for free and practice before playing for real money.
The feature set includes Special Wilds, a Blaster Wild, an Exploding Wild, symbol transformations, big symbols, and persistent multiplier effects. Three bonus symbols trigger the free drop bonus game, while four bonus symbols activate the Super Bonus game. In the bonus round, multipliers can carry over, the Octopus moves to a new position on each free drop, and the Jellyfish feature appears in every drop during the Super Bonus.
According to the game data, Oxygen 2 has high volatility, an RTP of 94%, a bet range from 0.2 to 100, and a maximum win potential of 25,000x. The rules screen also lists X-iter modes for players who want to jump directly into different bonus-entry options.