Giant Bubbles are obstacles in New Super Mario Bros. Wii. They only appear in World 7-2 of World 7 (NSMB Wii). Giant Bubbles are large masses of water in the air. When the player goes through them, he will act as if he was underwater. Until the player jumps out, he will continue to swim as if underwater. Giant Bubbles are either stationary or moving. You can use Giant Bubbles to cross gaps and access high areas, but also avoid enemies down below. Bullet Bills travel through Giant Bubbles more slowly.