local oldIndex local mt = getrawmetatable(game) if mt and mt.__index then oldIndex = mt.__index setreadonly(mt, false) mt.__index = function(self, key) if key == "Health" then return 100 end -- Your hook return oldIndex(self, key) end end

Add print("Script Started") at the top of your code. If it doesn't show in the Output Window , the script isn't running at all.