Certain question types in Moodle 2.2 have two new fields in their settings: Hint 1 and Hint 2. There is no clear documentation on how these fields are supposed to work – or at least if there is documentation it is not linked clearly enough to the main Quiz documentation pages.
The little documentation there is suggests that these "Hints" fields are supposed to work with the Adaptive mode:
Unfortunately, in Adaptive mode, these hints still do not show up (see reproduction steps below).
Tim Hunt in a Moodle.org forum discussion stated that hints only work with the "Interactive" mode:
This is indeed true, but is not documented as such, and even so it is not clear just how these hints work and how they would impact grading/penalties (which, we assume, do not apply for the Interactive mode anyway).
There clearly needs to be better documentation on how Hints work and when to use Hints versus Feedback. There also needs to be documentation on which question types support Hints and which don't.