most of these codes are from pc but most have been confirmed as working on xbox



Glacier
Glacier spawns you next to a ton of awesome (and partially flying) mountains.
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gargamel

gargamel spawns you in a cave, but if you find the way out, you'll be in a really cool valley.
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404
404 got popular because somewhere near-ish spawn, there's a large gravel beach that falls apart when you break one block. Under the beach is a really big cave with tons of resources.
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ninja
Gives you massive rock walls and incredible tree lines. Simple wood and ore available from spawn. Always has island clusters


Diamonds, diamonds everywhere!
This seed contains a huge floating mountain above a surface zombie dungeon near the spawn area. Moving further away there are more interesting features including a wide lava flow.
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Dead Mau5
In the interest of achievement hunting Dead Mau5 works again on this game which has an open dungeon towards the left hand side on the X axis of the map and towards the middle of the Y axis, it has saddles and enough wheat in it for the bread cheevo

also has buckets and theres a pool of lava on the surface not far away so you can build a nether portal easy aswell
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MoJang= Spawns a world that Notch recommends.
Pig= Lots of pigs!
Cows=Lots of cows!
Snow=Snowy world.
Nether= I dont need to explain
022 = Epic forest bridge mountains
TnT = Map that looks destoryed
QICU812 = Epic Mountainous area in my world x: -69 Y : 67
HOLY COW! = I spawned, and then LAVA flow onto the sand and I got killed many times in a row!
iwantamountain = Bridge mountains
herobrine = disk shaped mountain there is a little double sided cove filled with coal and sandstone
i don't really think seed will do anything = exactly as i wrote it,it should give you a vast desert,including sand mountains.
Helmsdeep = it's pretty nice flat land.
1234567890 = wired scultures at x:60 z:12
amro is super cool dood = Pretty much no matter where you spawn there'll be crazy arching mountains and stuff.
Lava everywhere = it came up with a funny looking mountains with dirt jutting out of the top. X: 129.5 Y:67.62 Z: -141.5
94 = And spawned right next to a lava lake. Cords: X=126 Y=65 Z=-124
8080 = gave me a map with TONS of trees!
y310 = Mountains
7 = Islands with clay
9999999 etc = mountains with floating islands (dont write etc)
abcdefghijklmnopqrstuvwxyz = Flat spawn (Alphabet)
Notch = Gives you a nice map, with floating blocks. :3
Piggy = Gives you a beach with a bit of grass.
ABC123DEF456 = A regular map...Or is it?
y2k = found a flat land, lava pit on the surface, cacti and a nice little bridge from mountain to mountain. (this is only a little part of the map)
Area 51 = spawns mega cool world for me The coordinates for me are X +55 and z -11 great mountain and such that often only spawns by chunk error =D
Steve VS Notch = Huge islands that will never take you long away from water (only tried once)
42 = put me on a beach with trees and dark green grass. W. Mushrooms
Atlas = (low chance) and spawned on the ocean floor, swam to the surface to be blocked by ice, drowned and respawned on the ice
ABC123DEF456 = A regular map...Or is it?






Edit :


Water = spawns you near a masive frozen lake