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dungeons guide is too complicated. basically try and make ur height drop as slow as possible from about 75 ft and every time ur speed drops below 150 angle up slightly and give a short rocket boost, then angle down to about 2% or 1% depending on how high up u are and how fast ur goin, keep that up till ur rockets run out and then just keep ur speed as high as you can while staying out of the water. DO NOT BOUNCE UNTIL THE VERY END! Bouncing lowers ur speed more than just angling up a little.
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GUIDE (PLEASE REPOST): Launch off, and bring your resistance to 1%. Watch your speed and keep it at 150 NO MORE NO LESS! When your altitude starts to fall fast, bring your resistance to 2%. Cruise like that until you are at about 5 altitude. Raise your resistance to 4% to gain altitude. When your speed reaches 125, bring your resistance to exactly 0%. DO NOT GO LOWER THAN YOU HAVE TO! Tap the arrow until it barely hits 0%. You will cruise down, bounce off the water, then hit 6000 ft. REPOST PLEASE!
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38 Days, but that was because I was taking the advice of idiots who recommended to fly high and drift down slowly. You gotta rocket high, nose dive to build up 200 mph and sustain it at 0% resistance as long as possible - I could have gotten 8000+ my way.