Hmmm....if I recall correctly, when you are at the trapdoors, you should move like this:
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Starting from the top, move two spaces to the right, then move south-west, then back to the middle. You should then only have 1 goblin to kill, which should be easy. The next time, you may have to move a bit further right, but once you see the goblin at the edge before he is going down, then you move back. Continue doing that, but if you run out of room, do the same thing on the left side instead.
I hope this helps...it's kinda hard to describe. Sorry! If you need more, just ask.
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--That guy with a million different aliases since he doesn't like this name anymore.