note moritz There's [https://prof.ti.bfh.ch/hew1/informatik3/prolog/p-99/|Ninety-Nine Prolog Problems], many of which are equally interesting for Perl programmers. The difficulties range from "trivial" to challenging. <p>Update: here's another one: [http://www.rosettacode.org/wiki/Main_Page|Rosetta Code]. It's a collection of common programming problems, with solutions in many programming languages. If you look a the problem first, and not at the solutions, it is another good set of exercises. (Sadly I haven't found a list of problems sorted by difficulty). <p>Both of these collections do not focus on perl specific tasks like text processing, though. 727606 727606