Rain Flush

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Rain Flush
Artwork for the Rain Flush in Mega Man 4
Game information
Description: Screen nuke which can also increase your jump distance while active.
Damage: 1
Added in version: 1.5.4
Series information
Game of origin: Mega Man 4
Other appearances: Mega Man IV
Programmer(s): WreckingPrograms
Spriter(s): Zedicon (weapon icon)

Rain Flush is Toad Man's signature weapon, originating from Mega Man 4 and reappearing in Mega Man IV. It is featured in Mega Man Maker as of version 1.5.4.

When the attack key is pressed, the user sends a pod straight up into the sky that harmlessly passes through all entities. After 1 second, the pod detonates, covering the whole screen in a shower of acid rain that damages enemies and most objects. On/Off Switches, Bokazurah, and Soccer Ball Jets are unaffected. The rain shower hits up to 5 times, and can push the player when in the air with the strength of a level 5 Rain object, with the direction of the push depending on where they were facing at the time of firing. If Rain is already present onscreen, Rain Flush will cancel it out while it's active. Unlike other water-based weapons, it can only extinguish Oil fires, and will raise Chemical Solution's level due to containing acid.


  • Rain Flush was chosen to be added to the game by a player named Lenny as a reward for being the winner of the Retro Redux challenge event. The contest's prize was being allowed to select a Robot Master weapon of the six NES games to be added between 1.5 or 1.6.
  • It was capable of causing Quicksand to harden in Mega Man IV, but it lacks this ability in Mega Man Maker due to time constraints.