See through walls

-- LocalScript: place in StarterPlayerScripts
-- ============ HIGHLIGHT ALL PLAYERS ============
local Settings = {
    FillColor = Color3.fromRGB(255, 0, 0),
    OutlineColor = Color3.fromRGB(255, 255, 255),
    FillTransparency = 0.5,
    OutlineTransparency = 0,
    ToggleKey = Enum.KeyCode.H,
}

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

local enabled = false
local highlights = {}

local function addHighlight(character)
    if not character then return end
    if highlights[character] then return end

    local highlight = Instance.new("Highlight")
    highlight.Name = "PlayerHighlight"
    highlight.FillColor = Settings.FillColor
    highlight.OutlineColor = Settings.OutlineColor
    highlight.FillTransparency = Settings.FillTransparency
    highlight.OutlineTransparency = Settings.OutlineTransparency
    highlight.DepthMode = Enum.HighlightDepthMode.AlwaysOnTop
    highlight.Parent = character

    highlights[character] = highlight
end

local function removeHighlight(character)
    local highlight = highlights[character]
    if highlight then
        highlight:Destroy()
        highlights[character] = nil
    end
end

local function highlightAll()
    for _, plr in pairs(Players:GetPlayers()) do
        if plr ~= localPlayer and plr.Character then
            addHighlight(plr.Character)
        end
    end
end

local function removeAll()
    for character, _ in pairs(highlights) do
        removeHighlight(character)
    end
end

local function toggleHighlights()
    enabled = not enabled
    if enabled then
        highlightAll()
    else
        removeAll()
    end
end

-- keep highlighting players who join or respawn while enabled
Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(character)
        if enabled and plr ~= localPlayer then
            addHighlight(character)
        end
    end)
end)

for _, plr in pairs(Players:GetPlayers()) do
    if plr ~= localPlayer then
        plr.CharacterAdded:Connect(function(character)
            if enabled then
                addHighlight(character)
            end
        end)
    end
end

UserInputService.InputBegan:Connect(function(input, gameProcessed)
    if gameProcessed then return end
    if input.KeyCode == Settings.ToggleKey then
        toggleHighlights()
    end
end)