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To add to AioriaRox's comment, it is very important that you have done the story mode first and gotten plenty of Bonus Points, because the hard badge will be impossible to get without MAXING OUT the top right 4 items in the bonus shop (feather, turbo, gas tank, anti-gravity), AS WELL AS the level 2 information meter
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This game keeps randomly sending me spiraling downward. When I tap the down button to slightly change my angle I suddenly change over 90 degrees.
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well god damn i played this game so long ago (i got the three first achievements oct 5th 2011) but i never got the last nor did i full clear it (got all the medals) so yesterday and today i sat my ass down and did it and holy crap is the medal page satisfying looking, also the hard badge is totally one of my favorites with the amount of stratergizing i had to do to get it it wasn't hard just tricky and i loved that