Oh noes!
We just got a report that this breaks in Linux (or really any OS that has a case-sensitive file system). As soon as I get home I'll try to find a system I can test on and get a patch up so you guys can play too but this won't be until much later tonight =(Sorry about that!
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Ah, the old filename case sensitivity problem (point 5 of the "gotchas"). Gets at least one team every PyWeek :-)
I uploaded a version with renamed files to match the case used in the code. I got a friend running linux to test out each level so everything should be okay now. 
    ldle  on
2010/04/04 03:55:
The error is the inability to find the image files. Your code says 'Left1.png' but the file is 'left1.png' etc