Sudoku Made and maintained by Brian Hamilton and Karan Hamilton.
Brian builds the playable puzzle tools, while Karan helps test clarity, difficulty feel, and the player experience.
Playable puzzles and controls are tested in the browser for rule accuracy, usability, and a clear solving experience. See how we make and test puzzles, our editorial standards, or report a problem.
New Year's Sudoku: A Puzzle Against the Clock
New Year's Sudoku is classic Sudoku dressed for the last night of the year — fireworks, clock, champagne, party popper, balloon, star, calendar, confetti, and sparkler. Whether you show the tiles as pictures or as plain digits, the rule holds: each one exactly once in every row, column, and box.
Before midnight
New Year's Eve has a famous design flaw: the gap between dinner and midnight is two or three hours long and nothing much happens in it. That gap is precisely one slow 9x9 wide. For the kids negotiating to stay up, a chain of 4x4s makes an honest countdown clock — one more puzzle, then one more — and the clock tile sitting on the board the whole time is either encouragement or mockery, depending on how the solve is going.
The party assembles in order
The beginner 4x4 holds the essentials: fireworks, clock, champagne, and party popper. The balloon and star float in at 6x6. The calendar, confetti, and sparkler wait for the full 9x9 — which produces two details we refuse to apologise for. The party popper is on the smallest board but its confetti does not land until 9x9, and the calendar, like the new year itself, only turns up at the very end.
Our daily Sudoku serves a fresh puzzle every morning — a resolution with the willpower built in. See you in February.
Two sparkles, kept apart
The fireworks and the sparkler are the set's twins — both bright bursts on a dark tile — and by luck of the ordering they never share a board until 9x9. If they start swapping on the big grid late in the evening, give the tiles their digit labels from the display options and carry on; nobody solves their best puzzle at 11:40pm.
Same rule, new year
Every puzzle here has exactly one solution, and no tile repeats in any row, column, or box — whatever the year on the calendar tile. The Themed Sudoku page holds the small print on grading and hints, plus the whole collection for the year ahead.
New Year's Sudoku FAQ
Tiles enter in order as the board grows: the popper is on the 4x4, but the confetti is tile eight and only lands on the full 9x9. The same ordering keeps the fireworks and the sparkler — the set's two look-alikes — apart until the biggest board.
A medium 9x9 comfortably fills the slow stretch between dinner and the countdown, and a hard one may take you right up to the fireworks. For children staying up, a chain of 4x4 puzzles works as a countdown of its own.
That is the one resolution we can help with: the daily Sudoku posts a fresh puzzle every day, which turns the habit into a routine rather than a willpower test.