In both modes of gameplay, Bubble was equipped with unlimited ammunition, either stars or torpedoes. Among such items included gems, coins and a icon which was necessary to play the shooter stages some items could be picked up and carried to other locations such as springs and the only icons the player could pick up in the shooter stages were extra lives and Speed-ups. Squeak, who was invulnerable to enemies and enemy fire, had his own and would help collect items or give Bubble a boost via piggy-back, letting Squeak toss him up to tall heights or by simply standing on top of Squeak's head.

Gameplay Players controlled Bubble and at any time during gameplay could command Squeak to either 'follow' or 'wait' for him. Shortly after, Squeak encounters a human boy known only as Bubble who agrees to rescue Squeak's captured populace.

The idyllic and mundane lifestyle of the feline aliens is interrupted when an alien invader known as Kat of Nine Tails kidnaps Grool's sentient populace, inadvertently leaving one of them, Squeak, behind. Story The story takes place on the planet Grool, a planet inhabited by mostly short, anthropomorphous felines.

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