finally 20x2! http://i.imgur.com/ynyWqyM.png http://i.imgur.com/ynyWqyM.png looks like it's best to keep the numbers as high as possible so it's easier to comb

finally 20x2! http://i.imgur.com/ynyWqyM.png http://i.imgur.com/ynyWqyM.png looks like it's best to keep the numbers as high as possible so it's easier to combine the blocks