In New Super Mario Bros. Wii, each level contains three Star Coins.
Star Coins are large, collectible coins hidden throughout the game’s courses. They are usually placed in locations that require careful platforming, exploration, or a specific power-up. Collecting all three in a course rewards thorough play and encourages players to search beyond the most obvious route to the goal.
The game contains eight main worlds, plus a secret ninth world. The Star Coins found in earlier levels help unlock the secret world’s courses, giving the collectibles a purpose beyond completion percentage. They can also be spent on hint movies, which provide gameplay advice and reveal secrets.
The wording “each level” is commonly confused with the number of levels in a world, but the answer refers to the fixed collectible count per course. Every course has three Star Coins, even though the levels vary in length, theme, hazards, and difficulty. Some courses also contain alternate exits, but those do not change the Star Coin total.