gistfile1.rb

Array.new(8) { [rand(10)] * 8 }
# => [[5, 5, 5, 5, 5, 5, 5, 5],
#     [7, 7, 7, 7, 7, 7, 7, 7],
#     [4, 4, 4, 4, 4, 4, 4, 4],
#     [9, 9, 9, 9, 9, 9, 9, 9],
#     [4, 4, 4, 4, 4, 4, 4, 4],
#     [10, 10, 10, 10, 10, 10, 10, 10],
#     [5, 5, 5, 5, 5, 5, 5, 5],
#     [6, 6, 6, 6, 6, 6, 6, 6]]
a.map! { |v| v.map! { |t| t + 1 } }
# => [[5, 5, 5, 5, 5, 5, 5, 5],
#     [7, 7, 7, 7, 7, 7, 7, 7],
#     [4, 4, 4, 4, 4, 4, 4, 4],
#     [9, 9, 9, 9, 9, 9, 9, 9],
#     [4, 4, 4, 4, 4, 4, 4, 4],
#     [10, 10, 10, 10, 10, 10, 10, 10],
#     [5, 5, 5, 5, 5, 5, 5, 5],
#     [6, 6, 6, 6, 6, 6, 6, 6]]