I archived what I could from the years I participated: 2018-2021:

https://github.com/luker983/nsa-codebreaker-2018

https://github.com/luker983/nsa-codebreaker-2019

https://github.com/luker983/nsa-codebreaker-2020

https://github.com/luker983/nsa-codebreaker-2021