I'm always interested in hearing what you think about these challenges, as well as hearing about how you solve them.
Keep in mind that between the time they are created and by the time that you do them, new vulnerabilities do appear that can make them easier to exploit.
There is one particular vulnerability that was revealed after the release of one of the challenges, which makes it very easy to exploit. That's just the way it goes, but even if you use the new exploit, you can claim it as a victory.
You can read more about each DC challenge by clicking on the links below. They can also be downloaded from there as well.