If you’re grinding to unlock the Grim Reaper Scorestreak in bo6 bot lobby, chances are you already know about the 622,000 XP requirement across Multiplayer and Zombies. While many players focus only on PvP, Zombies mode can offer huge XP gains—if you know what you’re doing.

This blog is your complete guide to using Zombies to farm XP efficiently and hit that unlock milestone faster.