If you prepend a constant with :: without a parent, the scoping happens on the topmost level. In this exercise, change push to return 10 as per A = 10 in the topmost level, outside the Kata module.module Kata

unsolved_lessons.rb

module Kata
 A = 5
  module Dojo
    B = 9
    A = 7
    
    class ScopeIn
      def push
        ScopIn::A  # (why if i write just "::A" - it work too ?)
      end
    end
  end
end

A = 10

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Kata::Dojo::ScopeIn.new.push should return 10

@rookie , if you want to have the test pass.

module Kata
A = 5
module Dojo
B = 9
A = 7

class ScopeIn
  def push
    10
  end
end

end
end

A = 10