The Knee Smash, also well known as The Knee or the Knee of Justice, (and a variety of other nicknames involving the term "knee"), is Captain Falcon's forward aerial in Melee, Brawl, 3DS, and Wii U and Super Smash Flash 2. It is an extremely powerful low-trajectory KO move often used at the end of Falcon's combos and for edge-guarding. It is not present in Super Smash Flash due to the limited number of attacks that characters were given. The move has properties similar to a sex kick due to the sweet spot being in the initial frames of the attack. The sour spot is in the last frames of the attack. It last longer, lacks the damage and power of the sweet spot. However, the sour spot acts as a semi-spike, albeit a very weak one. The Knee Smash can be used with the Falcon Punch to perform the deadly Sacred combo.