The Citadel Programming Lab is an online virtual secure coding game-based computer lab. The Lab combines a tower defence game with 6 security programming tasks. The lab is based on a serious game approach to join learning and playfulness. The lab’s platform combines a Unity game linked with a coding environment based on an instance of GitLab. The game elements and coding exercises are linked to CyBOK, the Cybersecurity Body of Knowledge, to map its cybersecurity content.