You do not need to replay the whole campaign. After finishing the game, go to "Mission Select." It tells you exactly how many Codex entries you have per mission. Start with the lowest count.
The first major hurdle. After crashing the mag-lev train, you enter a destroyed freeway tunnel.
In online forums like Reddit’s r/CallOfDuty and gaming wikis, the phrase "Codex work" has evolved into slang for the heavy analysis of the game’s fictional technology. call of duty advanced warfarecodex work
Fans debate the feasibility of the "Exo-Suit" boost jumps or the ballistics of the EM1 Quantum Directed Energy Weapon. This "armchair engineering" is often referred to as "doing the Codex work."
The defining feature of the Advanced Warfare codex is the widespread use of Exoskeletons (Exos). This technology changed the nature of warfare completely. You do not need to replay the whole campaign
The Codex includes Mitchell’s own medical records. The robotic left arm he uses isn't just for show. The logs reveal he suffers from "Phantom Limb Syndrome" and "Cortical Augmentation Psychosis." He is slowly losing his grip on reality, hearing voices (Gideon) that may not be there. This re-contextualizes his silent protagonist nature—he is dissociating.
The Atlas Corporation
Sentinel Task Force
The KVA