What does it mean to “complete the canon”?

Q: Your author bio says you’re on a quest to “complete the canon” and you have four plays to go. What does it mean to “complete the canon,” and which four plays haven’t you seen?

A: Generally speaking, there are 38 plays in Shakespeare’s “canon,” the accepted group of an author’s related works. (Authorities disagree on the exact number. As modern scholarship reveals more about Shakespeare’s collaborations with other writers, works may be added to the canon.)

I want to complete the canon by...