Not interested.
Slight interest - I'm open to trying this.
Interested - let's do this in class.
Very interested - let's do this frequently.
Unsure or no preference
In-class solo puzzles and challenge problems (e.g., today's DFA construction puzzles))
In-class small-group puzzles and challenge problems
Class time devoted to "troubleshooting": freeform Q&A, including concept and problem discussion
Class time devoted to worked examples/HW problem review