Thank you! Check the Hacking Playground: https://github.com/OWASP/OMTG-Hacking-Playground. It’s not finished yet, but you still have source code to ~20 vulnerable Android activities. However, if you’re looking for just mobile “crack me” apps then check out the following list: https://github.com/xtiankisutsa/awesome-mobile-CTF. Enjoy!
