Manual verification challenges are available on the Plus tier of Hosted CTFd or as a plugin in the CTFd store (https://ctfd.io/store/).
Using Manual Verification Challenges
Manual verification challenges are a good option for open ended questions, ie "Give an example of social engineering campaign and how you can protect against it". Manual verification allows you to grade the responses and award partial points.
Manual verification can be found on the Create Challenge page, under Challenge Types.
Participants will be able to submit their submission in a long form textbox.
Grading Manual Verification Challenges
You can grade the submissions in the Admin Panel -> Plugins -> Manual Submissions
The grade submission popup will have the options to Mark Incorrect, Mark Correct, or Award Points.