I'm assuming you mean something like this quiz:
http://www.sporcle.com/games/mic747/they-die-anyway-might-as-well-shoot-themTo set that up you will need to add the checkboxes, which you can copy from here: ☑ ☐ , if you want other characters, you can just copy them from any online site.
Then you put a <br> mark between the original hint and the checkboxes in the hint column and add all the possible answers in the answer column, so it looks like this:
Hint<br>☐☐☐☐ answer1/answer2/answer3/answer4
Hint<br>☑☐☐☐ answer2/answer1/answer3/answer4
Hint<br>☑☑☐☐ answer3/answer1/answer2/answer4
Hint<br>☑☑☑☐ answer4/answer1/answer2/answer3
I think that should solve the problem. If not, feel free to ask back.