#!/usr/bin/ruby

10.times do
  s = 0
  1.upto(9) do |x|
    1.upto(9) do |y|
      1.upto(9) do |z|
        if x + y + z == 15 && x != y && x != z && y != z
          1.upto(9) do |a|
            1.upto(9) do |b|
              1.upto(9) do |c|
                if( ( a + b + c == 15) && ( ( a != b ) && ( a != c ) && ( b != c ) ) )
                  1.upto(9) do |i|
                    1.upto(9) do |o|
                      1.upto(9) do |p|
                        if( ( i + o + p == 15 ) && ( ( i != o ) && ( i != p ) && ( o != p ) ) ) 
                          if( ( x + a + i == 15 ) && ( ( x != a ) && ( x != i ) && ( a != i ) ) )
                            if( ( y + b + o == 15 ) && ( ( y != b ) && ( y != o ) && ( b != o ) ) )
                              if( ( z + c + p == 15 ) && ( ( z != c ) && ( z != p ) && ( c != p ) ) )
                                if( ( x != b ) && ( x != c ) && ( x != o ) && ( x != p ) )
                                  if( ( y != a ) && ( y != i ) && ( y != c ) && ( y != p ) )
                                    if( ( z != b ) && ( z != a ) && ( z != o ) && ( z != i ) )
                                      s += 1
                                      $stdout.print "Solution ##{s}:\n"
                                      $stdout.print "#{x} #{y} #{z}\n"
                                      $stdout.print "#{a} #{b} #{c}\n"
                                      $stdout.print "#{i} #{o} #{p}\n\n"
                                    end
                                  end
                                end
                              end
                            end
                          end
                        end
                      end
                    end
                  end
                end
              end
            end
          end
        end
      end
    end
  end
end

#!/usr/bin/ruby

10.times do
  s = 0
  1.upto(9) do |x|
    1.upto(9) do |y|
      1.upto(9) do |z|
        if x + y + z == 15 && x != y && x != z && y != z
          1.upto(9) do |a|
            1.upto(9) do |b|
              1.upto(9) do |c|
                if( ( a + b + c == 15) && ( ( a != b ) && ( a != c ) && ( b != c ) ) )
                  1.upto(9) do |i|
                    1.upto(9) do |o|
                      1.upto(9) do |p|
                        if( ( i + o + p == 15 ) && ( ( i != o ) && ( i != p ) && ( o != p ) ) ) 
                          if( ( x + a + i == 15 ) && ( ( x != a ) && ( x != i ) && ( a != i ) ) )
                            if( ( y + b + o == 15 ) && ( ( y != b ) && ( y != o ) && ( b != o ) ) )
                              if( ( z + c + p == 15 ) && ( ( z != c ) && ( z != p ) && ( c != p ) ) )
                                if( ( x != b ) && ( x != c ) && ( x != o ) && ( x != p ) )
                                  if( ( y != a ) && ( y != i ) && ( y != c ) && ( y != p ) )
                                    if( ( z != b ) && ( z != a ) && ( z != o ) && ( z != i ) )
                                      s += 1
                                      $stdout.print "Solution ##{s}:\n"
                                      $stdout.print "#{x} #{y} #{z}\n"
                                      $stdout.print "#{a} #{b} #{c}\n"
                                      $stdout.print "#{i} #{o} #{p}\n\n"
                                    end
                                  end
                                end
                              end
                            end
                          end
                        end
                      end
                    end
                  end
                end
              end
            end
          end
        end
      end
    end
  end
end

Ruby sudoku solver

Ruby