local plrs = game:GetService("Players")
local uis = game:GetService("UserInputService")
local rs = game:GetService("RunService")

local lp = plrs.LocalPlayer
local hb_size = Vector3.new(10, 10, 10)
local state = false
local loop = nil
local cache = {}

local function update()
    for _, p in next, plrs:GetPlayers() do
        if p ~= lp and p.Character then
            local b = p.Character:FindFirstChild("Hitbox")
            if b and b:IsA("BasePart") then
                if not cache[p] then cache[p] = b.Size end
                b.Size = hb_size
                b.Transparency = 0.5
                b.Color = Color3.fromRGB(255, 0, 0)
                b.CanCollide = false
            end
        end
    end
end

local function reset()
    for p, s in next, cache do
        if p.Character then
            local b = p.Character:FindFirstChild("Hitbox")
            if b then 
                b.Size = s 
                b.Transparency = 1
            end
        end
    end
    table.clear(cache)
end

uis.InputBegan:Connect(function(i, g)
    if g or i.KeyCode ~= Enum.KeyCode.X then return end
    
    state = not state
    if state then
        loop = rs.RenderStepped:Connect(update)
    else
        if loop then loop:Disconnect() end
        reset()
    end
end)