• The Bandit challenge https://overthewire.org/wargames/bandit/
• Donate to the challenge maintainers at https://overthewire.org/information/donate.html
• PuTTY (helpful if you're on Windows) https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
• Questions or feedback? Email us at up1@brokentoysstudio.com so we can give you further hints and improve the content