SO solution

sticky_grid.rb

board = [[1, 2, 3],
         [4, 5, 6],
         [7, 8, 9]]

while (input = gets.chomp.to_i) != "exit"

  board = board.map.with_index do |row, i|
    row.map.with_index do |column, ii|
      if column == input
        "x"
      else
        row.length * i + ii + 1
      end
    end
  end

  board.each do |outer_row|
    outer_row.each { |inner_row| print "| #{inner_row} |" }
    print "\n"
  end

  puts "Type quit for exiting game, or a number"

end