Level 7 of Ruby Warrior (https://www.bloc.io/ruby-warrior#/warriors/26290/levels/7). This one was pretty straightforward to figure out.

Ruby_Warrior_Level_7.rb

class Player

  def initialize
    @health = 20
    @wall   = 0
  end
  
  def play_turn(warrior)
    if warrior.feel.wall? then warrior.pivot!
    else
      if warrior.health >= @health
        if    warrior.feel.enemy?              then warrior.attack!
        elsif warrior.health < 20              then warrior.rest!
        elsif warrior.feel(:backward).captive? then warrior.rescue!(:backward)
        elsif warrior.feel.captive?            then warrior.rescue!
        elsif warrior.feel(:backward).wall?    then @wall = 1
          warrior.walk!
        elsif @wall == 1                       then warrior.walk!
        else warrior.walk!(:backward)
        end
      else
        if    warrior.feel.enemy? && warrior.health > 3 then warrior.attack!
        elsif warrior.feel.empty? && warrior.health > 9 then warrior.walk!
        else  warrior.walk!(:backward)
        end
      end
    end  
    @health = warrior.health
  end
  
end