Sudoku ColorKu Travel Edition

Updated 2020-05-12 | After some user feedback, I've developed some improvements. The box now has cutouts to more easily remove the board. Additionally, I've implemented a way for the board to be secured in place (no more wrapping with rubber bands). Simply place the board in the top of the box (either side up) and press firmly to lock in place. To remove, on two opposite sides of the board there are indentions you can grab with your thumb and lift up while slightly pulling that side of the b