Immersive Cyber Range Exercising is a team-based cyber simulation platform that provides hands-on, interactive exercises for security teams to practice incident detection, response, and containment in a controlled environment. The platform delivers attack scenarios mapped to the MITRE ATT&CK framework, covering threat types such as ransomware outbreaks, advanced persistent threats (APTs), state-sponsored attacks, and zero-day exploits. Exercises simulate full attack chains including initial access, lateral movement, post-exploitation, and privilege escalation. Teams can practice rapid triage, forensic analysis, and crisis decision-making without real-world consequences. Exercises are role-tailored, supporting collaborative response across different security functions, and are typically designed to take four to eight hours, with the option to complete them over multiple days. The platform includes a benchmarking capability that tracks team performance metrics, identifies skill gaps, and compares results against industry peers. Post-exercise analytics provide data-driven insights into cyber readiness. Forensic analysis and threat hunting exercises leverage enterprise-grade tools such as Splunk, Velociraptor, and memory forensics techniques to investigate live adversary activity and assess breach impact.