World at War does make a leap for the Call of Duty series by offering two-player split-screen and four-player online cooperative campaign play. It's the same campaign as the single-player experience, though the number of enemies increases for every player that joins you. You can turn competitive scoring on and see who can earn the most points by killing enemies or reviving teammates, and this adds a bit of fun to the campaign and lightens to mood (it's hard to feel grim when there are point values popping up all the time). There are also special items called death cards in each level, and collecting these will allow you to enable a cheat for cooperative play (for instance, enemies die by headshots only or headshots cause enemies to explode). These add a little more spice to the pot, but the only tangible incentives are challenges. Completing these tasks (such as kill 100 enemies with pistols or take first 20 times in competitive co-op) will earn you experience points that go toward your multiplayer rank (co-op is not similarly ranked). Cooperative play is fun in its own right, but linking it to the addictive multiplayer ranking system makes it relevant in a whole different way.
Multiplayer battles are as fast and deadly as ever.
In case you missed it last year, the multiplayer system introduced in Call of Duty 4: Modern Warfare is fantastic, and World at War has updated it to fit its WWII setting. The hook is experience points, which you gain by winning matches or completing one of the aforementioned challenges. As you earn these points, you'll rank up and earn access to new weapons, new accessories (like sights and suppressors), and new perks. Perks are special abilities that grant you a wide variety of bonuses, but you can only choose four (one of which is vehicle-specific). This introduces an engaging element of customization: Will you choose to toughen up by increasing your health and bullet damage, or will you go the stealth route and increase your sprint speed while becoming invisible to enemy recon planes? Perks are well balanced, and you have multiple save slots, which enable you to easily switch between your various pretweaked loadouts. This allows you to take full advantage of this deep, engaging system that is just as great this year as it was last year, albeit slightly less novel.
There are, of course, new maps, and the bonuses you earn for kill streaks have been updated (notably, the attack helicopter you earned after seven kills in Modern Warfare is now a pack of nasty attack dogs). There are also a few maps that support tanks, powerful additions that mix things up without being too dominant. Most of the modes remain the same, though some have received slight tweaks and Capture the Flag has returned after a hiatus from Modern Warfare. The most striking new mode is actually a cooperative game called Nazi Zombies, playable when you beat the campaign (or play with someone who has). This absurd game puts up to four players in a house that is being assaulted by the undead. Killing the fiends and repairing the barricades earns you points that you then spend to replenish ammunition, buy new guns, and unlock new areas of the house. Each subsequent wave brings tougher, faster, more numerous enemies, and the game inevitably ends in grisly death. Though the random weapon box, assorted power-ups, and skills of your teammates add some variation, each play-through is similar to the last. Still, it makes for some intense, frantic fun and provides a welcome, if slightly bizarre, change of pace.
By staying largely true to the formula that made Call of Duty 4: Modern Warfare so successful, Call of Duty: World at War has ensured a proven level of technical quality, particularly in the multiplayer arena. On the other hand, one of Modern Warfare's strengths was its fresh approach, and by embracing a familiar setting and familiar mechanics, World at War achieves greatness but falls short of excellence. This is only a bad thing if you are expecting this game to top its benchmark predecessor. If, however, you are hoping for an exciting campaign, fun cooperative play, and engaging multiplayer action, then you'll find a lot to be happy about in World at War.