New Super Mario Bros. Wii/Items

Red mushroom
The red mushroom, as seen in almost every mario game to date. It moves along the ground and will fall in any gaps in the ground. If you grab it while you're short, it will make you grow, and you will be able to get other power-ups from Question Mark Blocks. If you already have a different power-up, it will just get you 1,000 or 200 points.

Ice Flower
The Ice Flower is an item that allows you to freeze enimies with balls of ice, similar to the Fire Flower. However, when you hit an enemy it will freeze into a block of ice, allowing you to smash it, pick it up and slide it on the ground, or use it as a stepping stone in water or even midair.

Fire Flower
The Fire Flower is a power-up that lets you throw fireballs, and has been in many of the games in the Mario series. When a fireball hits an enemy, it will be killed just like if you stomped it. These work well againt Pirahna Plants and enemies with shells.

Helicopter Mushroom
The Helicopter Mushroom is a new addition to the Mario series. When you grab it, you can to launch into the air, and on your way down you can either press  to drill down and take out enemies in your path, or press   to glide down, allowing you more distance to clear large gaps.

Penguin Suit
The Penguin suit is a new addition to the Mario series. With it, you can shoot ice balls from your flippers, swim much faster in water than normal, not slip on the ice, and slide along the ground taking out enemies.

Mini mushroom
The Mini Mushroom is a power-up added to the series in New Super Mario Bros. It makes you become smaller, allowing you to jump on enemies heads without killing them, jump higher and get more hang time, or to access otherwise too small pipes.

Starman
The Starman is a very rare power-up. With it you become rainbow and invincible, and can barrel through most enemies in your path. The only way to die while using this is to fall down a gap or into lava, you can't be killed by enemies. However, it only last for a short time.