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9x9 Project: Building Math Identity One Digit at a Time

@9x9.bsky.social
67 followers 39 following 121 posts

Project aimed at using variant sudoku as a vehicle to keep kids excited about math while fostering mathematical reasoning and communication skills. Follow for daily puzzles, project updates, and more!

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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/11/2025
Check out this puzzle by @fdmafc.bsky.social ! Fireworks - variant sudoku using entropic lines, kropki pairs, modular lines, thermometers, whisper-4 and 5. 🔗: sudokupad.app/v1wnf91ixz
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 09/10/2025
Check out this puzzle by @fdmafc.bsky.social ! Firing Wildly - variant sudoku using Arrows and Quadruples. 🔗: sudokupad.app/7i10ret7j6
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 08/10/2025
Check out this puzzle by @fdmafc.bsky.social ! Unknown Doubles - variant sudoku using X-Sums and Ratio dots. 🔗: sudokupad.app/39noaaesuy
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 30/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Flag - variant sudoku using whisper-5. 🔗: sudokupad.app/yw6ll0pr8v
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 24/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Input Output - variant sudoku using XV pairs and palindromes. 🔗: sudokupad.app/xxgjlxv33o
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 23/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Dot's Crazy! - variant sudoku using kropki pairs. 🔗: sudokupad.app/n6hva2svjo
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 17/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Ratiarrows - variant sudoku using arrows and ratio dots. 🔗: sudokupad.app/dft05ey02d
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 15/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Romans In and Out of Cages - variant sudoku using XV pairs and cages. 🔗: sudokupad.app/fw9mrlhldu
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 12/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Speed Bumps - variant sudoku using X-sums and quadruples. 🔗: sudokupad.app/f6fvrnvkar
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 11/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Five to Twelve - variant sudoku using XV pairs and cages. 🔗: sudokupad.app/d93d20aq05
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 09/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Marked Trail - variant sudoku using XV pairs and arrows. 🔗: sudokupad.app/r0jvreajqj
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 08/09/2025
Check out this puzzle by @fdmafc.bsky.social ! Pretzel - variant sudoku using XV pairs. 🔗: sudokupad.app/x14c8k53m7
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/09/2025
Check out this puzzle from @fdmafc.bsky.social ! Variant sudoku using cages and renban lines. 🔗: sudokupad.app/2rk0x52x35
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 24/07/2025
Check out this puzzle from @fdmafc.bsky.social ! Countdown 10, 9, 8 ...: variant sudoku using cages and thermometers. 🔗: sudokupad.app/2d6c6zf430
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 30/06/2025
Check out this puzzle by @fdmafc.bsky.social ! A Smattering of Dots - variant sudoku using Kropki pairs. 🔗: sudokupad.app/9xw1os15hl
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 27/06/2025
Check out this puzzles by @fdmafc.bsky.social ! Up In The Air - variant sudoku using German whispers and Kropki pairs. 🔗: sudokupad.app/6p5hor0fln
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 19/06/2025
Check out this puzzle by @fdmafc.bsky.social ! Juneteenth - variant sudoku using Dutch Whispers and Ratio dots. 🔗: sudokupad.app/qwljt8mdxq
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 08/06/2025
Check out this puzzle by @fdmafc.bsky.social ! Breastplate - variant sudoku using thermometers and consecutive pairs. 🔗: sudokupad.app/zv113l0vtl
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 07/06/2025
Check out this puzzle by @fdmafc.bsky.social ! Ring Around the Rosie - variant sudoku using arrows and quadruples. 🔗: sudokupad.app/41k6re8o1q
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 07/04/2025
Check out this puzzle by @fdmafc.bsky.social ! Completely Not Celtic - variant sudoku using cages. 🔗: sudokupad.app/faorvb2su7
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 06/04/2025
Our very own @fdmafc.bsky.social are presenting now! Join the livestream to watch ‘Snackdoku Setting Party’! #SudokuCon #9x9
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/04/2025
Having a great time at SudokuCon 2025! @fdmafc.bsky.social #SudokuCon #9x9
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/04/2025
The last digit has been placed in the “1 Sudoku 81 Solvers” challenge with Gliperal! #SudokuCon #9x9 #Sudoku
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/04/2025
9x9 Project partner, @zetamath.bsky.social , presenting on the Mathematics of Pencil Puzzles now at #SudokuCon !
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/04/2025
@sudokucon.bsky.social day 2 is on now with @rangsk.bsky.social , @sirxemic.com , and @killroy.bsky.social ! #SudokuCon #9x9
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 05/04/2025
Check out this puzzle by @fdmafc.bsky.social that was featured at #SudokuCon yesterday ! Dotty Days - variant sudoku using Kropki pairs. 🔗: sudokupad.app/sd5euspppa
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 04/04/2025
Glum Hippo is presenting on ‘Creating Your Own Sudoku Variant Workshop’ now! Tune into the #SudokuCon livestream here: sudokucon.com/livestream-t...
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Reposted by 9x9 Project: Building Math Identity One Digit at a Time
SudokuCon @sudokucon.bsky.social · 04/04/2025
The First SudokuCon is here!! We are excited to host everyone in Boston, MA and are looking forward to the next three days of puzzling fun! Tickets are still available for access to SudokuCon livestream. Information is here: sudokucon.com
sudokucon.com
SudokuCon
Official website for SudokuCon
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 04/04/2025
SudokuCon starts now!! @sudokucon.bsky.social
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 03/04/2025
Check out this puzzle by @fdmafc.bsky.social ! Double Dealing - variant sudoku using X-sums and cages. 🔗: sudokupad.app/8h7sbscdds
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 20/02/2025
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! Peace Frog by La Lune- variant sudoku using German Whispers, Row Indexing, Quadruples, Entropic Lines and Ratio Pairs. video🔗: youtu.be/BjkwBxqMOsA?... puzzle🔗: sudokupad.app/kf90fgjxqr
youtu.be
Sudoku U Journals : Peace Frog
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 20/02/2025
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! 1-9 by Damsalfly- variant sudoku using Little Killer, Cages and Sandwich. video🔗: www.youtube.com/watch?v=QCHN... puzzle🔗: sudokupad.app/asr5kh80ad
youtube.com
Sudoku U Journals : 1-9
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 25/01/2025
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! The End by Mastrosetter- variant sudoku using cages and kropki pairs. video🔗: youtu.be/ee6PBSBKX6c?... puzzle🔗: sudokupad.app/pi5d3ws2oq
youtu.be
Sudoku U Journals : The End
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 24/01/2025
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! Good Luck by Raspberry Dime, Hinsley, karl, and 591- variant sudoku using ratio pairs and modular lines. video🔗: youtu.be/7P8YcJeHb0c?... puzzle🔗: sudokupad.app/qz5g4fjqkx
youtu.be
Sudoku U Journals : Good Luck
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 22/12/2024
@timotab.bsky.social solves "Jail Break" by 9x9 Project students Qualter & Orion. Jail Break- variant sudoku using cages. video🔗: www.youtube.com/watch?v=bM96... puzzle🔗: sudokupad.app/pb1uq537p6
youtube.com
Student Spotlight: get out of jail if you can!
YouTube video by timotab
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 22/12/2024
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! Snakes by Mastrosetter & Triptup- variant sudoku using thermo and kropki pairs. video🔗: www.youtube.com/watch?v=lIee... puzzle🔗: sudokupad.app/g3rln1yps0
youtube.com
Welcome to Sudoku U : Snakes
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 20/12/2024
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! Drrows and Aots by Conejito- variant sudoku using arrows and kropki pairs. video🔗: youtu.be/XG0qxDE3MLY?... puzzle🔗: sudokupad.app/epr316klo0
youtu.be
Welcome to Sudoku U : Drrows and Aots
YouTube video by BremSter Puzzles
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 19/12/2024
Check out Sudoku Sleuth solve ‘Garden Party’ by @fdmafc.bsky.social ! 🔗: youtu.be/oOmMf-pFjGA?...
youtu.be
Garden Party: FullDeck and Missing a Few Cards remind us of the summer to come
YouTube video by Sudoku Sleuth
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 19/12/2024
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! Cherry Bomb by La Lune- variant sudoku using entropic lines, column indexer, ratio dots, x-sums, and fog. video🔗: youtu.be/Sc6_uApWKBM?... puzzle🔗: sudokupad.app/prq442jk5j
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 14/12/2024
Check out The Logic Lemur solve ‘Leidenfog’ by @fdmafc.bsky.social ! 🔗: youtu.be/lxnbx5nyUQM?...
youtu.be
A stroll through a foggy Dutch town
YouTube video by Logic Lemur Gaming
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 10/12/2024
Check out this puzzle by @fdmafc.bsky.social ! Water Rings - variant sudoku using ratio dots and thermometers. 🔗 sudokupad.app/zm6521k1vg
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 01/12/2024
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! 9 O'Clock by Qualter- variant sudoku using arrows and german whispers. video🔗: youtu.be/W9nfTYbqi7c?... puzzle🔗: sudokupad.app/naek4cbf72
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 30/11/2024
@bremster.bsky.social solves one of the 9x9 Project’s student puzzles in this new edition of Sudoku U! H2O nucleation by xiaobudian- variant sudoku using quadruples and thermometers. video🔗: youtu.be/dEwKBjmxJio?... puzzle🔗: sudokupad.app/nhdgb82ldp
youtu.be
Welcome to Sudoku U : H20 nucleation
YouTube video by BremSter Puzzles
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Reposted by 9x9 Project: Building Math Identity One Digit at a Time
Puzzle Patzer @puzzlepatzer.bsky.social · 28/11/2024
Darling Fountain, a lovely pizzle by @bremster.bsky.social and Fulldeck & missing a few cards. A combination of Nabner lines and killer cages! youtu.be/vlRjlLe8JSk
youtu.be
Puzzle Patzer goes over the top
YouTube video by Puzzle Patzer
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 25/11/2024
Check out this puzzle from @fdmafc.bsky.social ! The Silent Shaft- variant sudoku using arrows and german whispers. sudokupad.app/thfor7wuk1
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 25/11/2024
Check out this YouTube video from @bremster.bsky.social featuring 'Reuben' by @fdmafc.bsky.social ! Video: www.youtube.com/watch?v=jcsz... Puzzle: sudokupad.app/475fqwg98u
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 25/11/2024
Check out this puzzle from @fdmafc.bsky.social ! Seven of Diamonds- variant sudoku using cages and nabner lines. sudokupad.app/c2fa6axo3m
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 24/11/2024
There's another SudokuCon live-stream running right now: join at www.twitch.tv/sudokucon. Several of the 9x9 team (specifically FullDeck, Missing a Few Cards, and several of their students) are going to be hosting the stream from Noon to 3pm Eastern time. Hope to see you there!
twitch.tv
SudokuCon - Twitch
Second Annual 24 Hour Livestream!
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 22/11/2024
Check out this puzzle by @fdmafc.bsky.social ! Holes - variant sudoku using kropki pairs and modular lines. sudokupad.app/n1hwclt759
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9x9 Project: Building Math Identity One Digit at a Time @9x9.bsky.social · 14/11/2024
Check out this puzzle from @fdmafc.bsky.social ! Garden Party- variant sudoku using german whispers and cages. sudokupad.app/6o1vx3g4sq
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