Of course, collision and comprehensive car insurance coverage are not the only optional modes of coverage you have to choose from when you are assembling your policy and putting together car insurance rate quotes. (carinsurancequote.net)
However, the game is balanced well enough that most TD gamers can succeed while optional modes provide a challenge for the hardcore fans... (toucharcade.com)
It is not an optional mode of existence but is integral to the human status. (religion-online.org)