The entire CCB project and assets are now listed for sale on 1kprojects.com, and is featured on the homepage! Have a look if you're interested in taking over this project.
A hands-on approach to studying data structures and algorithms
A physical coloring book of the essential data structures and algorithms you should know for your coding interview.
A beta-tested, market validated, pre-launch product that made it to the #1 spot on Hacker News in 2017.