PurpleDuel turns cybersecurity lessons into a browser game

Field notes

The six lab tracks run from Linux fundamentals and encodings through reconnaissance, web exploitation, privilege escalation, and blue-team defense. Each lab is described as having a task, learning objective, required commands, and a defensive lesson; its simulated terminal works on fictional files and services, with a write-up at the end. The site also lists optional Bit packs and a Premium Battle Pass, while saying purchases are not required for learning.