Hi Ruby Student,

I'm not sure this is the solution you are looking for. But try it out. ;-)

require "green_shoes"
require 'rubygems'

Shoes.app :height => 666, :width => 811, :resizable => false do
   background magenta
   title (strong("Sudoku")), :size => 26, :align=>'center'
    para " "
   para " "

   @btn = Array.new(9) {Array.new(9) {123456789}}

   nostroke
   rect 0, 100, 86*9+6, 53*9+3, fill: green
   rect 86*3+3, 100, 86*3, 53*3+2, fill: yellow
   rect 0, 100+53*3+2, 86*3+3, 53*3, fill: yellow
   rect 86*6+3, 100+53*3+2, 86*3+2, 53*3, fill: yellow
   rect 86*3+3, 100+53*6+2, 86*3, 53*3+1, fill: yellow

   (0..8).each do |r|
      stack :margin => 3 do
         flow :width => 866 do
            (0..8).each do |c|
               @btn[r][c] = button "123456789", :width => 86, :height => 50
            end # End do c
         end # flow
      end # End stack
   end # End do r
end # app

Regards,
ashbb