World Tubes (Over, Nether and End) v1.0

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Map info:
If you would like more information about this map, or wish to contact the creator, then please visit the map's official thread on the Minecraft Forum located here: World Tubes (Over, Nether and End).

Creator's Notes:
Play/beat the game like you would normally, just only inside the tube :P

Rules:

• Don't use cheats (any kind of InvEdit or Commands)
• Don't destroy the tube, or the Brick ceiling in the overworld
• Don't make a Nether portal, you have to find the one that's already there 
• Play on anything but peaceful
• Tell me what you think 

Challenges:
I'm skipping the obvious, it's survival, so you do what you have to 

• Find the dungeon
• Get to the top floor
• Make a enhancing room (optional, but might be useful) 
• Find the nether portal
• Kill some Blazes
• Find the Ender Portal
• Open the Ender Portal 
• Go kill that Enderdragon 

If you have ideas for more, write a comment ^^