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Throughout the game you'll end up collecting bubbles when busting question mark boxes. There's even a counter for how many you have collected on screen but what do they do? Well, they basically take you back in the game. Kind of like a save point to a certain extent. Say if you're playing and you die, and you have a bubble to use, it will take you back in the game to an earlier point and allow you to pick up from there.
Throughout the game you'll end up collecting bubbles when busting question mark boxes. There's even a counter for how many you have collected on screen but what do they do? Well, they basically take you back in the game. Kind of like a save point to a certain extent. Say if you're playing and you die, and you have a bubble to use, it will take you back in the game to an earlier point and allow you to pick up from there.