World 8-4 is a level found in the game New Super Mario Bros. Wii.
- Star Coin 1: The first Star Coin is located in the second area, atop the long platform with the numerous Stone Spikes. Mario and co. must swim to the surface, jump on the platform and avoid all of the Stone Spikes to get the Star Coin.
- Star Coin 2: In the third area, the second Star Coin, along with four Bloopers, are caged individually by several blocks. Mario and co. must activate the nearby ? Switch to make all of the blocks disappear and make the Star Coin accessible.
- Star Coin 3: In the fourth area, the third Star Coin is in a small opening in the rocks, to the left.
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