You can sort series by the following:
- Word Density: Sort by word density from lowest to highest.
- 85% Coverage: Sort by number of unique words to have 85% known total word coverage, from lowest to highest.
- あいうえお: Sort alphabetically…more or less. Kanji may not always word by reading.
Logged in users may also sort by:
- Known Words: Sort by number of known total words, from highest to lowest. This is the default sort for logged-in users.
- Known Sentences: Sort by number of known sentences, from highest to lowest.