The FUBAR 7k run is not has hard as you think once you realize the soldiers on the sides of you are shooting but not hitting you. The ones straight in front do the damage. Make sure you stock up on health shots before you start and get to the church to stock up again if needed.
I don't see anybody have the hard badge recorded yet so here is mine I completed today. http://youtu.be/dgZ9buJlWGI The key to the hard badge is making sure you hit all the birds that you can and keeping your speed up. Level 9 will either make you or break you I think its the hardest.
I couldn't find any of these methods in the comments that worked for the hard badge so I made my own. I used three robin hoods and one cat. Fully upgraded candy before anything. Then upgraded attack and special. Use the rest to upgrade speed and magnet. Should be able to get 30k+ pretty easily with this strategy.
I was looking for ''QUI'' for hours and then I grew a brain and found a better way. All you need to do is go here ''http://words-with.com/q-and-x.html'' and this will give you tons of words where you do not need ''QUI'' to start with. Some of these words include ''benzoquinoxaline'' , ''benzofuroquinoxaline'' , ''oxyquinoline'' , ''sulfaquinoxaline'' , ''quintoxine'' , and ''quinoxaline''. There is 6 words that end with the same suffix that all work! Vote up so people can actually get help!
I got through 5-2 with 0 killed before I realized you could do 1-2 with 0 killed. So it is possible to only die only 4 times and still get to paradise meadows.
If your going for the hard badge, save yourself some misery and take the time to get at least 23-24 achievements to help with the last challenge. I bought ''3'' on steering, ''3'' on bumper, and ''4'' on tires. Even with really great controls and high defense, you have to do whatever it takes to avoid the plane bombs. Going off into the sand is alright if that will help you miss them. I recorded my run and it will be on my youtube if anyone needs help.
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Nice advices ;)