F.L.U.D.D.

F.L.U.D.D., known in Japan as Pump, was originally 's side special move in Super Smash Flash 2 until v0.2b of the SSF2 Demo, where it was replaced by Cape.

Overview
This move worked very different from its  counterpart, as it was more of an offensive move than a defensive move. When performed, Mario would pull out his water cannon F.L.U.D.D., which he would then jump onto to release a charge of water that would launch himself forward, striking any opponents in his path. The move could be charged as well, and it would deal anywhere from 10% to 20% damage with decent knockback, depending on the charge. The attack would also slow Mario's descent while being charged, which, combined with the far distance it travels, would make it excellent for recovery.

F.L.U.D.D. Tornado
During the creation of 's new sprite sheet, former developer ItsameSMB created a new down special move for him, called the F.L.U.D.D. Tornado A version for Fire Mario was made as well. However, this concept was scrapped following Mario's resprite, and because it was un-intuitive, so it was never used in any demos. The effects this attack would have had are quoted word-for-word below:


 * "Oh, boy, where to start... Mario's down special w/ F.L.U.D.D. If the special button and down key are held through the first few frames of the animation, F.L.U.D.D. appears on his back and squirts while the special button is held. Water is shot from the nozzle above his head and goes to the left or right depending on the frame of the animation is shot at. The angle of the squirt can be slightly rotated with the up and down keys, and he'll move somewhat in a horizontal direction if the key for that direct is held (think like Luigi's down special in Brawl with half the distance and a spinning version of Mario's down special in brawl[sic] with half the distance).


 * He falls at a slightly lower rate on the air when this move is used (he still falls, though). In addition to pushing foes with water with no damage or hitstun, the push-back from the water shot out can be enough to make him fall faster or ascend depending on which way the nozzle is aimed, as well as the horizontal movement and speed increase during the move (in short, the greater the water pressure, the more it pushes Mario back during the move's usage.


 * Speaking of which, F.L.U.D.D. charges every moment that it is not used. The pressure starts at 0 and is limited to 100. The water pressure is indicated by the range the charge percentage falls into. It goes from weak (0-24%, short range, little push strength on enemies, no pushback on Mario) to notable (25-49%, slightly more range, adequate push strength on opponents, little push-back on Mario) to moderate (50%-74%, decent range, considerable push strength on opponents, some push-back on Mario) to strong (75-99%, mid-long range, mid-high push strength on opponents, some-mid push-back on Mario) to max (100%, long range, high punch back on foes, moderate push-back on Mario).


 * After every use, it resets to 0% (when Mario is KO'd, F.L.U.D.D.'s charge lowers by 5%). If the player does not hold the input for the F.L.U.D.D. Mario Tornado[sic], it is just the SMG Mario Tornado animation (which I will upload later) without F.L.U.D.D., which is like Luigi's SSBB down special, but with less movement in terms of directions and F.L.U.D.D.'s charge does not reset to 0%. Regardless of whether or not F.L.U.D.D. is on his back or not (or even if it is squirting), Mario's down special is similar to Luigi's, but it is harder to get out of but does not move as much. One last thing: the F.L.U.D.D. tornado can be used as many times in the air as desired, but the recovery push-back it provides would only exist if it was charged past 25%, while the SMG Tornado, which can also be used as many times in the air as you want, can only be used once in the air to get a vertical recovery."
 * — ItsameSMB

Origin
The device F.L.U.D.D. originates from the game Super Mario Sunshine, where it was used throughout the majority of the game. Mario used F.L.U.D.D. to get rid of the pollution that was running rampant in Delfino Plaza. F.L.U.D.D. needed to be re-charged every so often and to recharge it, Mario had to go into a body of water to fill F.L.U.D.D. up. Its use in the official Super Smash Bros. games resembles the way Mario uses the device to spray enemies or clean up the area. The way it was used in SSF2 is not exactly present in Super Mario Sunshine, although it seems to be loosely based on the Rocket Nozzle.

Trivia

 * This move garnered controversy among the community during its time in SSF2, with many suggestions in the Bug Reports suggesting to take it back or to replace the Mario Tornado to the Super Smash Bros. Brawl variant of F.L.U.D.D. instead.
 * Originally, the move could not be charged, but this was changed in v0.2a of the demo.