Gives Pry _1, _2, _3, etc. variables (`_n` is equivalent to `_out_[n]`).

pry-extra_underscores.rb

require 'binding_of_caller'

class Object
  def method_missing(name, *args)
    if name =~ /^_(\d+)$/
      binding.of_caller(2).eval("self").output_array[$1.to_i]
    else
      super
    end
  end
end