Super Jump Punch
The Super Jump Punch is a third jump that Mario, Luigi and Dr. Mario can perform in Super Smash Bros. and Super Smash Bros. Melee, and by screenshots and gameplay videos, it is confirmed that Mario and his brother Luigi are able to perform it in Super Smash Bros. Brawl. It is executed by pressing B while holding the control stick upwards; thus, it is their up B attack. When performed by either of the "Marios", they jump up diagonally with more vertical range than horizontal; if the attack strikes an enemy during the jump, coins fly out of the enemy, and the foe receives about 10% damage.
Luigi's Super Jump Punch only deals 1 point of damage, and has little knockback. However, if the attack's sweet spot hits a character, it becomes a powerful Fire Jump Punch which deals around 25% damage with high knockback. In SSBM, Luigi's attack sends him vertically without any horizontal range, forcing him to rely on his Green Missile for recovery. In Brawl, Luigi turns upside down at the peak of his jump, falling on his head. This allows for more horizontal movement after the move but has more landing lag compared to his Melee Super Jump Punch.
On a side note, in relevance to the technique and appearance of the attack, some people also call this move the Pay-Day Punch.