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Squeaky Mallet is Luigi's Offensive Power Shot in Mario Power Tennis. Luigi pulls out a huge Hammer similar to Mario's Iron Hammer and hit the ball with great force, leaving a path of small green and pink stars. This will knock the opponent back about a quarter of the court and cause the opponent to lose whatever Power Shot he or she may have stored. Although not as fast and powerful as Mario's Offensive Power Shot, it has better recovery time and is a bit more curved. The stun time after contact is also greater.
The Hammer that Luigi wields may be a Mini-Mega Hammer from Mario Party 4 with a star painted in the center instead of a Mushroom. The green and pink stars may also represent the Super Mega Mushrooms and Super Mini Mushrooms. It is even more possible that Luigi's Hammer is a popular Japanese toy often called the "squeaky hammer" (or just "toy hammer") in the United States. The squeaky hammer is rather famous for often being in an anime gag where it is pulled out of nowhere and crushes someone; strangely, its victim is often male with the attacker female.