Call of Duty: World at War is the fifth main addition to the popular FPS series, Call of Duty. It was developed by Treyarch and published by Activision for a range of consoles; the Nintendo DS version of the game is slightly different to the other versions of the game.
For most versions of the game, the plot follows three characters during World War II. The first character if Private C Miller of the US Marines who was captured by the Japanese during his fight in the Pacific campaign. Private Dimitri Petrenko is the second playable character in the game as he fights on the Eastern Front while the final character is Petty Officer Lock who is only playable during one mission.
The game uses realistic World War II weapons which the player gains as the story progresses however the player can only carry two weapons at once; weapons can be collected from dead enemies or friendly troops to replace a weapon and gain more ammo. Some weapons in the game also have additional attachments. However, they cannot be re-attached to other guns.
Players have three main stances which affect several gameplay factors such as accuracy and stealth; crouching, for example, provides the player with greater cover which helps them avoid taking damage. Cover is important in the game as it's the only way to avoid taking damage from enemies and allows the player to recover some health. Regeneration is the only way to regain health in the game.
The main co-op mode in the game is Nazi Zombies where up to four players fight to survive against waves of the undead; this mode can be played online with four players of offline with two players using split-screen. To survive the waves of zombies, players need to protect their location by boarding up windows to limit the access points available to the zombies.
Online multiplayer includes six different modes which are mostly team-based; players increase in rank by killing other players or completing objectives. A players rank affects what weapons are available to them with the strongest weapons only being accessible at the highest ranks. Once the player reaches the top rank, it's possible to reset the rank which gives the player points for Create-A-Class.
The Create-A-Class feature allows players to design a person class to use in multiplayer matches; with this, players can customize their weapons and perks.
Killing a specific number of players in succession will start a Killstreak which gives that team a boost for a short period; there are three special killstreaks in the game that can show the enemy positions on the mini-map, call in artillery or summon dogs to attack enemy players.
 What's New
The biggest change in the game is the addition of open-ended missions that allow players to complete their missions in various ways; the AI teammates also help the player achieve the objective in their chosen manner.
Another significant addition to the game is the co-op campaign with up to four players can fight through the campaign together when using an internet connection; it's also possible to play with up to two players over a local connection with split-screen.
The addition of drivable tanks in the multiplayer is new to the series; each player also has access to vehicle perks which can customize the character towards a particular playstyle. While the tanks are in the multiplayer, their usable zones on the maps are limited. Two players can be in a tank at once; one player controls the main cannon, and the other works the machine gun however if one player is in the tank then it's possible to switch between the weapons.
 DS version differences
This version of the game features a different plot spread across three new characters: Private Rook from the US Marines, Private Dawkins from the British Special Air Service and Private Dimarkurato from Russia. There are three main campaigns which each use one of the main characters.
Gameplay in this version of the game is almost identical to the other versions. However, it includes several minigames which based on real tasks which were completed during World War II. The minigames are touchscreen-based, and the main gameplay has also been adjusted to work with the touchscreen.
The online multiplayer is no longer active, but there is local multiplayer where players can work together or against each other to complete multiple objectives. This version of the game does not include any ranks or perks.
Realistic World War II weapons – Fight using classic World War II-era weapons
Cover based – Stay out of the line of fire to avoid damage and regenerate health
Co-op campaign – Go online with up to four players or play two person co-op through split-screen
Nazi Zombies – Take on the hordes solo or work with other players in a co-op experience
Online multiplayer – Fight in six different team-based modes
Tanks – Take control of tanks in the multiplayer to dominate the battlefield
Create-A-Class – Forge a new class by ranking up through the multiplayer
Killstreaks – Earn a Killstreak to give the team an advantage
 Players liked:
- Decent campaign
- The zombie mode
- Co-op campaign
 Players didn't like:
- Weak multiplayer
- Lack of single player content
- No replay value
Call of Duty: World at War is available for the PlayStation 2, PlayStation 3, Xbox 360, Wii, Nintendo DS and Windows PC. Some versions of the game are slightly different and do not offer all of the features or use a different story.
 Minimum Windows requirements
- OS: Windows XP/Vista/7
- Processor: Pentium 4 3 GHz/AMD 64 3200+
- Graphics Card: nVidia GeForce 6600/ATI Radeon X1600 or better
- Memory: 512 MB / 1 GB for Vista
- Hard Drive: 8 GB