World at War features more mature themes than previous Call of Duty installments and is open-ended, giving the player multiple ways to complete objectives, but otherwise generally plays like previous iterations of the franchise. Players fight alongside
A character can be positioned in one of three stances: standing, crouching, or prone; each affecting the character's rate of movement, accuracy, and stealth. Using cover helps the player avoid enemy fire or recover health after taking significant damage, as there are no armor or health powerups. When the character has taken damage, the edges of the screen glow red and the character's heartbeat increases. If the character stays out of fire, the character can recover. When the character is within the blast radius of a live grenade, a marker indicates the direction of the grenade, helping the player in deciding whether to flee or throw it back at the enemy.
The single-player campaign includes thirteen hidden "death cards", denoted by playing cards attached to makeshift war graves. There is one in each level (barring those that take place in vehicles); collecting them unlocks cheats for Co-op mode, such as reduced enemy endurance and "paintball mode".
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