Red shells are very common in Mario Kart Wii. There are a few ways to defend against these attacks.
1. Drag a banana, green shell, or red shell behind you. You can hold down the B button to do this.
2. When approaching a turn that has a wall, stay close to the wall on the side you will be turning. Then turn sharply around the corner. If done right, you can make the red shell hit the corner of the wall.
3. Whip around an item such as a banana that’s left on the course. Sometimes the red shell will hit the item instead of you.
