new_contents: #  ------
  # |>a S @|
  #  ------
  
  level.description("You feel a wall right in front of you and an opening behind you.")
  level.tip("You are not as effective at attacking backward. Use warrior.feel().is_wall() and warrior.pivot_() to turn around.")
  
  level.time_bonus(30)
  level.ace_score(50)
  level.size(6, 1)
  level.stairs(0, 0)
  
  def add_abilities(warrior):
      warrior.add_abilities('pivot_')
  level.warrior(5, 0, 'east', func=add_abilities)
  
  level.unit('archer', 1, 0, 'east')
  level.unit('thick_sludge', 3, 0, 'east')
  
subject: Add tower 7