What was the category of the project name Mighty No. 9?
CREATE TABLE "ten_largest_successfully_completed_kicks" (
  "rank" real,
  "total_usd" real,
  "project_name" text,
  "creator" text,
  "category" text,
  "pct_funded" real,
  "backers" real,
  "closing_date" text
);
SELECT "category" FROM "ten_largest_successfully_completed_kicks" WHERE "project_name"='Mighty No. 9';