What is Level 16 in Sudoku?

Level 16 puzzles have 21 given clues. The fewer the clues, the harder the puzzle.

How is the ranking calculated?

Players are ranked based on the fastest completion time for Level 16 puzzles on 2026-01-02.

This leaderboard shows the top 50 players who solved Level 16 Sudoku puzzles with 21 clues the fastest on 2026-01-02.

Level 16 is part of Sudoku99’s structured difficulty progression, where lower clue counts mean greater challenge.

Rank	Nickname	Country	Time	Puzzle
1	Guest #53239		00:06:29	#276914
2	Guest #53225		00:18:59	#34235

What does Level 16 mean?: It corresponds to puzzles with 21 clues. Fewer clues means higher difficulty.
How often is this ranking updated?: Every day. Rankings reset daily and show results for the current date.
Can I appear without logging in?: Yes. You can still appear in the leaderboard as a guest player.