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For the hard medal, I used cruise missile, full fuel, level 3 ramp length and height, The Plank Mark II and H.I.G.H Tech. I also maxed the ramp angle, do it if you can. Go up with the cruise missile, and then start gliding, maintaining a speed around 230.
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Click the penguins beak on the main menu to get every mode unlocked. Thumbs up so people can see!!! (you also get battlepoints and a medal called the easy way)