These are the answers to the Puzzle Page Sudoku for December 21, 2021, puzzle ID 1663. The board below is the completed 9×9 grid exactly as it looks in the app once every square is filled .
Sudoku is one of 20 puzzle types published in Puzzle Page, and this date carried 7 puzzles in total — you can see all of them on the December 21, 2021 page. To work through this game date by date, use the full Sudoku archive, or step back to December 20, 2021.
Because Sudoku is solved with digits rather than letters, the board above is the finished arrangement — every cell filled exactly as the app accepts it. Compare a single row or block against your own grid rather than copying the whole thing, and the rest usually falls into place from the constraints you already have.
Puzzle Page numbers each game separately, so the ID on this page belongs to Sudoku alone — a Sudoku published the same day carries a different one. If the grid here stops matching your screen the app has been updated; say so in the comments and it gets re-checked. Every grid on this site is captured from the finished puzzle rather than copied from another answers site.
Other Puzzles on December 21, 2021
Frequently Asked Questions
What are the Puzzle Page Sudoku answers for December 21, 2021?
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How Puzzle Page Sudoku Works
Fill the grid so every row, column and box contains each digit exactly once.
Tips for Puzzle Page Sudoku
- 1
Scan for the digit that already appears most often — it is the easiest to place next.
- 2
Work boxes, rows and columns in rotation rather than staring at one region.
- 3
When a row has one empty cell, fill it immediately; those cascade.
- 4
Pencil in candidates only when scanning stops producing placements — otherwise it slows you down.
- 5
A digit that can only go in one cell of a box goes there, even if that cell has other candidates.
- 6
Scan by number, not by square. Take each digit one to nine in turn and place every certain instance of it across the whole board before moving on.
- 7
When scanning stops producing placements, switch to counting candidates in a single box. A digit that can only go in one cell of that box is placed regardless of its row or column.
Puzzle Page Sudoku Facts
| Puzzle type | Sudoku |
|---|---|
| Date | December 21, 2021 |
| Puzzle ID | 1663 |
| Grid size | 9 x 9 |
| Theme | — |
| Answer words | — |
3 Tips for Puzzle Page
The board is the whole puzzle
Every answer is built from what the level actually shows you and nothing else. Counting that first rules out most of what comes to mind, which is quicker than trying words and being rejected.
Place the longest answer first
Long answers use up the awkward letters and leave a set that spells the short ones out for you. Starting long is consistently faster than sweeping for three-letter words.
Neighbouring levels are the best hint
Difficulty climbs gradually rather than in jumps, so the levels either side of a hard one reuse its patterns. They are more useful than any hint the game sells you.
How to Solve a Puzzle Page Level
The order that clears a board fastest.
Read what you are given
Letters, tiles or clues — count them before you start. That constraint is the strongest filter you have.
Anchor with the answers you are sure of
Each confirmed answer narrows the ones it touches, so the easy entries are worth the first minute.
Work outwards
Follow the chain from what you have placed rather than jumping around the board.
Verified Answers, Not Guesses
How we verify these answers
Every answer on this page is read from the game's own puzzle data rather than retyped from another site, and is checked against what the board actually provides — so nothing listed can use a letter the level does not give you. The counts shown are computed from the stored data, not typed in by hand.
Reviewed by Priya Raghunathan, Word Games Editor at Puzzle Solved. The full checking routine is in the methodology, and the standards every page is held to are in the editorial policy.
Last checked — Aug 24, 2026