Currently all Python Morsels users get an automatically-assigned exercise every week. If I send you an exercise you don't like, you're stuck with it (though you can always email to ask for a different one).
Flexible Mode adds some flexibility to your weekly (or monthly) exercise routine. With Flexible Mode enabled, you'll get 1 exercise credit each week as well as a suggestion for which exercise to solve next.
If you're not interested in my suggested exercise, you can skip it and choose a different exercise instead.
You can even sample exercises from different skill levels.
This feature is currently in beta and can only be enabled from this page.
If you try this feature out, I'd love to hear your feedback on it.