Click on event view, click up on warps, and in the corner there should be a red box with 'W' in it. drag that to the door/Ceve entrance to set. Then save to finish! walk through and BAM! Right in your Face! :)
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There are hidden exits on some levels, and when completed, will open up the warp cannon. Warp cannons will transport you 4 worlds ahead, for example, the warp cannon in world 1 will transport you to world 5.
you cant
You delete your old profile and click start new game.
Build the map on Creative Mode then go to seedscope.net and upload your level.dat for the map on the Change Survival to Creative option. You should then download the new level.dat. Replace it with the old level.dat and when you start Minecraft, you should see that it is now a survival map.
I heard that the new map pack will be out in the spring of 2010, followed by another map pack sometime in late summer/early fall. Hope this helps!