We did this lab at the University of Utah because the Systems class is taught out of the same textbook. I also loved this lab. If I remember correctly we had a leaderboard, and it was fun competing with everyone else.

Most of the labs for this textbook were great: writing a shell, implementing common math functions by bit twiddling, buffer overflows, disassembling the bomb with the debugger, etc. It was a great class. Definitely not easy, but a lot of fun.