Universal infjump (kinda)

-- LocalScript inside StarterPlayerScripts

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoidRootPart = character:WaitForChild("HumanoidRootPart")

-- Create the part under the player
local followPart = Instance.new("Part")
followPart.Size = Vector3.new(4, 1, 4) -- size of the part
followPart.Anchored = true
followPart.CanCollide = true
followPart.Material = Enum.Material.Neon
followPart.Color = Color3.fromRGB(0, 255, 0)
followPart.Transparency = 0.5
followPart.Parent = workspace

-- Function to update part's position under the player
local function updatePart()
    if character and humanoidRootPart then
        followPart.Position = humanoidRootPart.Position - Vector3.new(0, humanoidRootPart.Size.Y/2 + followPart.Size.Y/2, 0)
    end
end

-- Toggle collision switch
local toggle = true

-- Create a GUI button for toggle
local screenGui = Instance.new("ScreenGui")
screenGui.Parent = player:WaitForChild("PlayerGui")

local toggleButton = Instance.new("TextButton")
toggleButton.Size = UDim2.new(0, 100, 0, 50)
toggleButton.Position = UDim2.new(1, -110, 0.5, -25) -- right side
toggleButton.Text = "Toggle Collision"
toggleButton.BackgroundColor3 = Color3.fromRGB(255, 100, 100)
toggleButton.TextColor3 = Color3.new(1,1,1)
toggleButton.Parent = screenGui

toggleButton.MouseButton1Click:Connect(function()
    toggle = not toggle
    followPart.CanCollide = toggle
    if toggle then
        followPart.Color = Color3.fromRGB(0,255,0)
    else
        followPart.Color = Color3.fromRGB(255,0,0)
    end
end)

-- Update loop
game:GetService("RunService").RenderStepped:Connect(updatePart)