The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Sudoku in Python in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 1st ovs-code 🇩🇪 1,000 299 32ms 29 Jun 2025 2nd bricknellj 984 304 32ms 7 Jan 2023 3rd primo-ppcg 🇹🇭 958 312 15ms 27 Apr 2021 4th JayXon 🇺🇸 934 320 15ms 21 May 2023 5th btnlq 931 321 35ms 18 Oct 2020 6th blaztoma 🇱🇹 898 333 33ms 12 days ago 7th pardouin 🇫🇷 867 345 38ms 15 Nov 2024 8th Steffan153 🇫🇮 857 349 12ms 11 Feb 2026 9th hallvabo 🇳🇴 842 355 34ms 24 Sep 2021 9th SirBogman 🇺🇸 842 355 34ms 7 Jun 2022 9th 5cw 🇺🇸 842 355 32ms 28 Mar 2024 12th sean-niemann 🇺🇸 835 358 16ms 17 Mar 2025 13th kg583 🇺🇸 808 370 156ms 28 Jun 2024 14th neel11235813 799 374 33ms 29 Feb 2024 15th TFeld00 🇩🇰 797 375 51ms 4 Nov 2020 16th inventshah 795 376 39ms 22 Jul 2022 17th MeWhenI 🇻🇦 781 383 86ms 29 Jan 2023 18th snoozingnewt 🇨🇦 771 388 36ms 12 days ago 19th stefangimmillaro 769 389 616ms 29 Oct 2023 20th m-tkach 🇺🇦 767 390 53ms 22 Jun 2022 21st lifthrasiir 🇰🇷 759 394 77ms 16 Nov 2024 22nd Flekay 🇩🇪 757 395 33ms 17 days ago 22nd aksyristos 757 395 31ms 7 hours ago 24th jared-hughes 749 399 116ms 20 Sep 2022 25th ahmetdemirag 🇨🇾 746 401 97ms 4 Mar 2025 26th bzijlema 🇳🇱 742 403 801ms 2 Oct 2025 27th ryyyn 🇺🇸 740 404 332ms 3 Dec 2025 28th Lydxn 🇨🇦 738 405 38ms 26 Apr 2021 29th dzhang314 735 407 33ms 16 Aug 2019 30th GolfingSuccess 🇬🇷 731 409 81ms 11 May 2022 30th duckyluuk 🇳🇱 731 409 72ms 22 Mar 2024 32nd RDShah 719 416 23ms 11 Jun 2022 33rd daedals 712 420 257ms 19 Jun 2019 34th RYNO8 707 423 198ms 9 Sep 2021 34th DialFrost 🇸🇬 707 423 117ms 14 Feb 2024 36th StefanHabel 🇨🇦 697 429 39ms 19 days ago 37th neihousaigaai 687 435 13ms 15 Apr 2021 38th anter69 🇭🇺 675 443 232ms 9 Mar 2022 39th CornerMercury 🇬🇧 673 444 17ms 26 days ago 40th emgordon154 660 453 27ms 1 May 2025 41st CedricGebistorf 647 462 19ms 10 Mar 2022 42nd Irratix 🇳🇱 644 464 59ms 27 Apr 2022 42nd jatloe 644 464 24ms 16 Sep 2024 44th NewDefectus 🇮🇱 631 474 35ms 21 Sep 2021 44th albanian-laundromat 631 474 14ms 16 Sep 2025 46th cros107 🇦🇺 624 479 119ms 7 Sep 2025 47th zhaohm14 616 485 25ms 16 Jan 2026 48th face0xff 610 490 95ms 20 Oct 2021 49th CaedenHarper 🇨🇦 598 500 57ms 31 Oct 2025 50th InigoK 🇺🇸 592 505 56ms 9 Oct 2025 51st cakular 589 508 22ms 19 May 2024 52nd SniperSmiley 🇺🇸 587 509 123ms 18 Jul 2022 53rd argusdusty 🇺🇸 585 511 20ms 25 Mar 2021 53rd jacklynnepenick 585 511 79ms 17 Aug 2021 55th jakobkordez 🇸🇮 584 512 20ms 2 Nov 2022 56th commandz0 🇺🇸 581 515 15ms 3 Nov 2022 57th Psirving 579 516 16ms 2 Aug 2020 58th amollberg 🇸🇪 578 517 34ms 20 Feb 2022 59th prplz 🇦🇺 572 523 416ms 13 Oct 2020 60th annaproxy 566 528 2,654ms 30 Jan 2022 61st KatieLG 🇬🇧 563 531 32ms 19 Apr 2025 62nd fynnkroeger 558 536 30ms 23 Jul 2021 63rd wh3n3v3r 🇨🇿 552 542 18ms 14 Nov 2024 64th OllieBoyne 🇬🇧 549 545 27ms 3 Feb 2021 65th mokymok 🇺🇸 534 560 53ms 15 Dec 2021 65th ndren 534 560 36ms 26 Nov 2025 67th LeeCamp 533 561 664ms 22 Dec 2021 68th SB-945 529 565 450ms 17 Jan 2024 69th janbehrens 🇩🇪 527 567 339ms 17 Jun 2023 70th kistlerf 🇨🇭 526 568 56ms 19 May 2025 71st QuincyNash 🇺🇸 520 575 527ms 4 Dec 2022 72nd DarkTemplar5 519 576 18ms 6 Mar 2020 73rd mbittner20 509 587 43ms 14 Apr 2025 74th MaxElf999 509 588 11ms 29 Sep 2022 75th Lv0Sys 🇵🇱 507 590 20ms 2 Dec 2025 76th guilhem-roy 🇫🇷 505 592 19ms 7 Mar 2022 77th BREMAUCY 🇫🇷 501 597 19ms 4 Oct 2025 78th ly0va 500 598 40ms 8 Sep 2021 79th adamnielson42 🇺🇸 493 607 112ms 27 Nov 2023 79th croc54 493 607 39ms 14 Dec 2024 1–80 of 151 Next Last
