w0t

local UserInputService = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
local character
local humanoid

local canDoubleJump = false
local hasDoubleJumped = false
local oldPower
local TIME_BETWEEN_JUMPS = 0.2
local DOUBLE_JUMP_POWER_MULTIPLIER = 2

function onJumpRequest()
if not character or not humanoid or not character:IsDescendantOf(workspace) or
humanoid:GetState() == Enum.HumanoidStateType.Dead then
return
end

if canDoubleJump and not hasDoubleJumped then
hasDoubleJumped = true
humanoid.JumpPower = oldPower * DOUBLE_JUMP_POWER_MULTIPLIER
humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
end
end

local function characterAdded(newCharacter)
character = newCharacter
humanoid = newCharacter:WaitForChild("Humanoid")
hasDoubleJumped = false
canDoubleJump = false
oldPower = humanoid.JumpPower

humanoid.StateChanged:connect(function(old, new)
if new == Enum.HumanoidStateType.Landed then
canDoubleJump = false
hasDoubleJumped = false
humanoid.JumpPower = oldPower
elseif new == Enum.HumanoidStateType.Freefall then
wait(TIME_BETWEEN_JUMPS)
canDoubleJump = true
end
end)
end

if localPlayer.Character then
characterAdded(localPlayer.Character)
end

localPlayer.CharacterAdded:connect(characterAdded)
UserInputService.JumpRequest:connect(onJumpRequest)