Penguin Suit in New Super Mario Bros. Wii? Doesn't Exist—You're Thinking of Another Game

There is no Penguin Suit in New Super Mario Bros. Wii (2009). The game's power-up roster:

• Super Mushroom
• Fire Flower
• Starman
• Ice Flower (freezes enemies)
• Propeller Mushroom (flight)
• Penguin Suit — NOT IN THIS GAME

Where the Penguin Suit Actually Appears

• New Super Mario Bros. U (Wii U, 2012) / New Super Mario Bros. U Deluxe (Switch, 2019): Penguin Suit debuts here. Grants ice balls, sliding on belly (breaks blocks, defeats enemies), better ice traction, swimming control.
• Super Mario 3D World (Wii U / Switch): No Penguin Suit. Cat Suit, Tanooki Suit, Double Cherry.
• Super Mario Maker 2 (Switch): Penguin Suit available in NSMBU style.

Why the Confusion?

• NSMBW (Wii) and NSMBU (Wii U) have similar names, art styles, and 4-player co-op.
• Ice Flower exists in both—but only NSMBU adds the full Penguin Suit.
• Wiki lists often group "Ice Flower / Penguin Suit" together.

NSMBW Ice Flower vs. NSMBU Penguin Suit

If you're playing NSMBW on Wii: you have Ice Flower. That's it. Want Penguin Suit? Play NSMBU Deluxe on Switch.