Python challenge and project euler
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euler
balloons.jpg
cave.jpg
channel.py
channel.zip
d1.txt
d2.txt
delta1.txt
delta2.txt
deltas.gz
deltas.gz.bak
foo
integritypw.txt.bz2
integrityun.txt.bz2
level1.py
level11.py
level13.py
level15.py
level16.py
level17.out
level17.py
level17.txt.bz2
level17b.py
level18 .out
level18+.out
level18-.out
level18.out
level18.py
level18b.py
level19.in
level19.invert
level19.out
level19.py
level19b.py
level2.sh
level20.out
level20.py
level21.out
level21.py
level3.sh
level3.txt
morris.hs
mozart.gif
ocr.txt
package.pack
pc21.zip
plot.png
readme.txt
rec00001level17.txt.bz2
unreal.jpg
white.gif
wire.png
wrap.hs

readme.txt

Yes! This is really level 21 in here. 
And yes, After you solve it, you'll be in level 22!

Now for the level:

* We used to play this game when we were kids
* When I had no idea what to do, I looked backwards.