Oops I did this last year too but whatever

Quick question for curiosity/feedback purposes: now that the 2015-2016 NIMO contest season has come to a close, what were your favorite and least-favorite problems from this academic year? Contests include 20-24 as well as April 2016. (These problems can be found on the NIMO website or on the Contests page/NIMO forum for a refresher.)

I'm not sure what my role in future NIMO contests will be - most likely I'll still be around but in more of a figurehead position (since my problem writing focus has turned almost exclusively to CMIMC and the AMC/AIME/USA(J)MO). But even still, it's sometimes fun to think about these kinds of things