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The zone was very easy. The camera and buggy ledges made it harder then it should of been that's but all though
You can only do the first zone. And in a way thank god because it's very buggy and camera glitchy at the moment.
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http://medias.luna-atra.fr/gw2/char_tool/CT_imageGenerator.php?pseudo=Centurion Mikal&lang=EN&code=&code=TSwtLDUsLSw2LC0sMjksOSwyMiwyMywyNCwtLDEwMiwzNiw4MSw4NCw4OQ==
"As you read these words, a release is seven days or less away or has just happened within the last seven days those are now the only two states youll find the world of Tyria."...Guild Wars 2
Those mushrooms you skipped that you said you didn't know what they did are the same as the mushrooms from the other levels. You attack them a few times so they drop below, sprout, and turn into springs that allow you to jump back up. They're basically checkpoints so you don't have to redo the whole beginning of the zone over again if you fall at some point.
As for the "hardest jump" in the beginning, you don't have to do it the way you're doing it at all lol. You can just walk right around that corner on the lower ledge and then jump up. No flying acrobatic leap around the corner from top ledge to top ledge required.