The game has a Bubble Pot, where bubbles are collected, represented by an oxygen cylinder on the left side of the reels. Any win bigger than the player’s total bet adds one bubble to the Bubble Pot. The manometer bar increases with every bubble added to the pot. Once 20 bubbles are collected, 20 free games are triggered with a x5 win multiplier.
3, 4 or 5 Scatter symbols anywhere on the reels trigger 9, 12 or 15 free games respectively. During free games, the win multiplier x3 is applied to all wins.