Ctrl + click unanchor part?

Hey, what AlexTheCreator said is a way to do it, but not the 'right' way. What you need to do is make a LocalScript, put it in StarterGui or StarterPlayer>StarterPlayerScripts. You need to put this code in the script:

local Mouse = game:GetService("Players").LocalPlayer:GetMouse()
local UIS = game:GetService("UserInputService")
local CTRLisBeingPressed = false

UIS.InputBegan:connect(function(input)
    if input.KeyCode == Enum.KeyCode.LeftControl then
        CTRLisBeingPressed = true
    end
end)

UIS.InputEnded:connect(function(input)
    if input.KeyCode == Enum.KeyCode.LeftControl then
        CTRLisBeingPressed = false
    end
end)

Mouse.Button1Down:connect(function()
    if CTRLisBeingPressed == true then
     local Obj = Mouse.Target;
        local unanchor = Obj.Anchored
        if unanchor ~= nil then
            Obj.Anchored = false
        end
    end
end)

If you have any other questions, please tell me.

I'm pretty new but I think you should use the UserInputsService (or https://wiki.roblox.com/index.php?title=API:Class/UserInputService/InputBegan) to detect when the CTRL button is being held and then detect if the block has been clicked using a ClickDetector :)