The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
12 Days of Christmas in all languages 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 401st MeWhenI 🇻🇦 874 453 5ms 3 Jul 2023 402nd stefangimmillaro 874 467 2,785ms 29 Oct 2024 403rd SirBogman 🇺🇸 874 515 286ms 5 Oct 2020 403rd sean-niemann 🇺🇸 874 515 291ms 6 May 2024 405th lynn 874 522 27ms 11 Jul 2023 406th jaredcrystal 🇺🇸 873 435 32ms 15 Dec 2020 407th KatieLG 🇬🇧 873 460 9ms 2 May 2021 407th jordanmbell 873 460 8ms 7 Dec 2021 407th polyrtm 873 460 11ms 17 Mar 2022 407th rummik 873 460 11ms 18 Oct 2022 407th trinityy-7 873 460 9ms 2 Oct 2023 407th helbling 🇨🇭 873 460 10ms 24 Feb 2024 413th Attero 🇸🇪 873 476 388ms 21 Nov 2021 413th Gaddy 🇫🇷 873 476 385ms 3 May 2022 413th hemphen 873 476 407ms 28 Aug 2022 416th Santarii 873 495 119ms 7 Oct 2019 417th SirBogman 🇺🇸 873 496 121ms 18 Jan 2020 418th AnAwesomGuy 873 513 401ms 10 Jan 2026 419th Shanethegamer 🇺🇸 873 523 25ms 28 Dec 2022 420th olivermrose 🇺🇸 872 444 1,269ms 28 Oct 2021 421st TaserTheFox 🇺🇸 872 447 243ms 8 Jun 2023 422nd dokutan 872 451 802ms 10 Dec 2025 423rd skrivy 872 454 4ms 31 Oct 2020 424th sean-niemann 🇺🇸 872 463 157ms 14 Nov 2023 425th DialFrost 🇸🇬 872 488 2ms 8 Nov 2023 426th jared-hughes 872 489 1ms 29 Mar 2022 427th ccbrown 872 516 289ms 18 Apr 2020 427th cloudyshoe 872 516 293ms 20 May 2025 429th Natanaelel 🇸🇪 871 401 39ms 26 Jul 2022 430th KatieLG 🇬🇧 871 436 36ms 10 Apr 2022 430th SirBogman 🇺🇸 871 436 35ms 8 Dec 2023 430th neel11235813 871 436 35ms 26 Mar 2024 433rd GrayJoKing 🇦🇺 871 445 453ms 16 Jan 2024 433rd m-tkach 🇺🇦 871 445 447ms 21 Jan 2024 433rd MeWhenI 🇻🇦 871 445 501ms 24 May 2024 433rd error256 871 445 498ms 12 Aug 2024 437th user189032 871 461 10ms 29 May 2019 437th ScottHamper 871 461 10ms 25 Jun 2021 437th nathanadams 🇳🇿 871 461 9ms 29 Aug 2021 437th LukeBridges 🇬🇧 871 461 10ms 20 Oct 2022 437th inventshah 871 461 10ms 23 Jan 2023 437th cloudyshoe 871 461 9ms 20 May 2025 443rd BlankSpruce 871 466 439ms 27 Nov 2024 444th luciaaibarblanco 🇪🇸 871 477 432ms 21 Nov 2021 445th MCausc78 🇺🇦 871 494 300ms 5 Jan 2023 446th SubsTheTechnomancer 871 517 286ms 6 Mar 2023 446th snoozingnewt 🇨🇦 871 517 287ms 23 Sep 2023 446th neel11235813 871 517 294ms 26 Mar 2024 449th israem 870 448 274ms 14 Apr 2024 450th Steffan153 🇫🇮 870 475 113ms 29 Mar 2023 451st dokutan 870 491 118ms 12 Dec 2025 452nd msbranicky 870 498 97ms 15 Sep 2023 453rd DialFrost 🇸🇬 869 354 6ms 21 Jan 2025 454th Frowny 869 432 33ms 13 May 2021 455th D-MOVE 🇵🇭 869 437 35ms 3 Feb 2026 456th p01 869 462 10ms 13 Jan 2018 456th daifkyou 869 462 10ms 14 Dec 2022 456th weliveinhell 🇭🇹 869 462 10ms 25 Dec 2023 459th TeodorDyakov 🇧🇬 869 515 449ms 21 Jan 2026 460th lukechampine 869 518 304ms 16 Apr 2020 460th edsrzf 🇳🇿 869 518 290ms 4 Mar 2025 462nd o0lit3 🇺🇸 868 408 1,025ms 30 Jul 2021 463rd paulhey 868 449 251ms 27 Sep 2021 464th Kacarott 🇦🇺 868 453 69ms 24 Nov 2023 465th dloscutoff 868 462 783ms 27 Nov 2018 466th MostParsingVex 868 507 62ms 23 Jan 2025 467th SirBogman 🇺🇸 867 433 33ms 16 Apr 2022 468th dokutan 867 461 1,001ms 30 Aug 2025 469th BobbyGerace 867 463 10ms 21 May 2021 469th raphaelimahorn 867 463 10ms 17 Aug 2021 469th olivermrose 🇺🇸 867 463 10ms 10 Oct 2021 469th stefangimmillaro 867 463 9ms 23 Apr 2023 469th ryanocf 867 463 9ms 16 Jan 2024 469th two-bad 🇬🇧 867 463 10ms 3 Feb 2024 469th targrik 867 463 9ms 7 Feb 2025 469th dokutan 867 463 9ms 20 Apr 2025 477th Shanethegamer 🇺🇸 867 477 108ms 31 Oct 2024 478th makononov 867 521 185ms 28 Feb 2025 478th KasperKivimaeki 🇫🇮 867 521 166ms 7 Oct 2025 480th marcus-gomes-v 🇧🇷 866 355 6ms 14 Dec 2021 First Prev 401–480 of 4,083 Next Last
