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Re:Here is a puzzle entitled "lowercase" by jtheory on Tuesday August 13, 2013 @05:17PM (#6208327)
Oh, come on -- don't cheat!

Though I admit I don't currently have the time to get far (I've gotten the first couple but have work to do tonight...). I love these puzzles, though!

I quite enjoyed going through the web penetration puzzle posted here a year or so ago -- where to access the next URL at each step involved a slightly trickier exploit (starting at just reading the HTML source, to modifying form fields, to tweaking cookies, etc.) -- anyone remember where this was?

It was educational (as well as fun), so at least I could excuse burning some time doing it.

Re:Here is a puzzle entitled "lowercase" by trjordan on Tuesday August 13, 2013 @05:18PM (#6208333)
That was Stripe's Capture the Flag: https://stripe-ctf.com/

Super fun!