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For the 150 mph : The components : Get the 2nd rocket, get the 2nd flight, upgrade all your acceleration and your ramp height. The map : Go on the 35' or 50' ramp, when started, go as high as you can and when you're to the maximum, hold space and go down. Hope it helped.
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ARRRGGHHH! IT's SO frustrating to try that 19 days challenge.. Extremely hard task and been trying it all day. Closest is 5500 in day19.. Ughh...