Ghosts replaced the traditional Zombies mode with , a class-based alien survival mode [10].
Unlike many other titles in the series, Ghosts has been criticized by players for its lack of explicit in-game tutorials for specific mechanics like leaning around cover [24]. call-of-duty-ghosts-installment-tutorials
: Choose between Tank, Weapon Specialist, Medic, or Engineer. Each class has unique upgrades that are critical for team survival [2]. Ghosts replaced the traditional Zombies mode with ,
: Gabriel Rorke, a former Ghost leader who was brainwashed by the Federation after being abandoned on a mission [25, 29]. call-of-duty-ghosts-installment-tutorials
The story follows brothers Logan and David "Hesh" Walker [23]. They join the Ghosts to fight the South American Federation (SAF) after a devastating orbital strike on the US [4].