Zombies: Der Riese... The Mystery Unfolds...

Der Riese, my personal favorite zombie map, allows challenging and yet easy gameplay. Although the words, "Easy" and "Challenging" contradict each other, It actually depends on how you play it. You can choose to play it challenging the whole game or to play it easy in the beginning and hard later. It depends on your strategy; for example, if you run around with a double barreled shotgun the whole game without camping, it will be challenging for the entire game. It won't get easier; it will, at most, get a bit harder, as zombies will be faster. But when zombies are at their max speed, they won't get any harder. And if you camp, it will be too easy until you get to about round 8. Combining these 2 strategies will result in an epic 17-round slaughter. It's simple. Camp until you are overrun then run around, shooting zombies. Get some good random weapons, a juggernog, and speed cola, and you're invincible. I did this once and, as a result, got to round 17. So grab your guns and get ready for an epic battle!
A great thing about Der Riese is that it also includes revealing secrets about the mysterious Element 115. My suggestion is that you watch a YouTube video showing you the secret story behind Nazi Zombies.

The Main Zombie Cast

Edvard (Or Edward) Von Richtofen is a German. He has always manipulated his allies in battle with the zombies. No one really knows what his motives are except that they are bad. You will be him if you are player 4. Treyarch custom designed him.
Takeo is a Japanese soldier. He throws up whenever he goes in the teleporter. He is very accurate, and, must keep his honor. You will be him if you are player 3. Treyarch used the Japanese officer from the WaW campaign for him.
Nikolai Pelenski is a Russian. He loves Vodka. He doesn't care about anything for others, for the most part. He just wants Vodka and Glory. Motive enough to kill zombies. You will be him if you are player 2. Treyarch used Chernov from the WaW campaign for him.
Tenk (Or Tank) Dempsey is an America. He just wants to kill zombies. He apparently wants revenge of some sort. You will be him if you are player 1. Treyarch used Polonsky from the WaW for him.

Zombies: "Nacht Der Untoten"... German for "Night of the Undead"

The first zombie map and definitely the easiest. Hardcore Pros, hold out at the starting point for as long as you can, buying guns on the wall. Regular pros, average, and noobs, I have 3 strategies for you. 1: Get to the help room, random, and buy guns. Hold off at the help room stairs. 2: Get to the help room, random, buy guns, open the help room stairs, then hold off at the buyable grenade on the wall. If you have two people, have one watch the window while another watches the door. DO NOT OPEN THE STARTING POINT STAIRS FOR STRATEGY 1 OR 2. DOING SO WILL GET YOU KILLED! 3: Open all doors and both stairs. Buy a shotgun or random a shotgun. Now run around throughout the building, killing zombies with your shotgun. Keep moving, and do not corner yourself. There is also an easter egg. To the right of the random weapon box there is a radio. Knife it, and it will play music.

Zombies: Moon

"Where the heck am I?" You might ask. Well, you're in Area 51. "But I thought this was on the Moon!" It is. You start at Area 51. Now, just kill a few zombies. If you hear an alarm, run to the nearby caged teleporter. It will open. Hurry, there is a horde of fast zombies, Crawlers, and Dogs chasing you. Once in the teleporter, you will teleport to the moon. As soon as you're up, run to the nearby spacesuit, grab the mask, then use the equipment button to put it on. Now, you will see a spaceman roaming around in the room. He is a Cosmonaut. Stay away from him, or else he'll grab you and teleport you, causing damage. If he teleports you twice, you are dead. His name will appear in red above him. It will say a random name of any player. The Cosmonat is killable, but if you kill him he comes back next round. Another interesting feature of Moon is that there is low gravity. You can jump and glide around. If you kill a zombie he will fly through the air like some sort of acrobat. Don't jump off the moon, as there are a few places where it is possible to do so. A great strategy for this map is to open up a bunch of doors, get a shotgun, and run around killing zombies. Otherwise get to the random weapon box and hold off there.

Rezurrection

Treyarch decided they would remaster the original WaW zombie maps along with an epic new map: Moon. If you got the prestige edition of Black Ops, you can get this FREE. I already had the prestige edition, which comes with a real RC-XD, an epic Black Ops case, and 2 bonuses: The original WaW zombie maps and the woods profile pic. Let the slaughter begin!

Zombies: Ascension... Ultimate 1 Player Strategy?

One of the best zombie maps of all time would be Ascension. Heres a 1 player strategy: Do your normal stuff, but try to get to the power. Once there, make sure you buy an M14 and a quick revive. Hold off until you are downed, then when you are up again buy another quick revive. Keep this up and you are bound to last at least 5 rounds. As for a two player strategy, my main suggestion would be to get to the power, then got to the lander station 2, and hold off for as long as you can (Make sure you call the lander when you first get there). When you are overwhelmed, hit the lander button and blast off. The blast will kill all zombies surrounding the lander. While flying, shoot at the zombies below you. Now that you are at station 1, hold off as long as you can then blast off yet again. Repeat this strategy and you will have plenty of points with which to buy stuff. But if you buy a perk, watch out for the monkeys!

Zombies: Call of the Dead

This is no doubt the hardest, "Zombies" installment since World at War's "Verruckt". The epic and comical intro to "Call of the Dead" is almost reason enough to play it. The mission itself, however, is legendary. The most important rule of Call of the Dead: Don't attack George. You know, the tall guy with white hair and pony-tail carrying a spotlight around. Should you accidentally hit him, he will roar and chase after you. To survive, run into the lake with him chasing you. This will slow him down. Don't stay in the lake for long, or you'll freeze to death. The second most important rule of Call of the Dead and most imporant rule of Zombies in general: Watch your back. In Call of the Dead, zombies can come from anywhere, from the roof, from the ground, and from, of course, the barriers. There are 2 main strategies for Call of the Dead: Run around killing the zombies, or camping. Running around killing zombies: Save up alot of points. Get your hands on either a submachine gun or a shotgun, and have a powerful gun in your other weapon slot. Make sure you still have alot of points. Now, run around, opening doors and killing/wounding the zombies. In the event that you get cornered with nowhere to go, quickly switch to your powerful weapon and blast your way through. Camping: In Call of the Dead, there are 2 great spots to camp. 1: The top of the ship, near the zipline. This camping place is easiest with at least 2 people. Go next to the zipline. If you have opened the door that leads into the small room with the power box, have your friend watch it or without a friend put yourself in a position that you can see parts of both the small room and the zombies advancing in the front. If the mob becomes too big for you to handle, jump down the zipline. Be careful though, because zombies and George can also go on the zipline. 2: The small island in the middle of the lake, near the starting position. This position is great because it slows down the zombies and makes them easier to kill when they are in the ice-cold water. If the mob becomes bigger than you can handle, try to blast your way through the weaker side. Depending on which side you run out on, run into the ship or the lighthouse. I rate Call of the Dead a 5/5.