An online capture-the-flag challenge for Singapore citizens, run by CSIT every year since 2020. You play alone through a chain of increasingly difficult challenges in areas such as web, forensics, reverse engineering, binary exploitation and IoT, logging in whenever you like during the nine-day window. The 2026 edition offered cash prizes for the top five finishers and exclusive collectibles. The challenges are hard, so some programming and cybersecurity experience helps.