The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 lynn 909 522 27ms 11 Jul 2023 402nd textninja 908 429 35ms 26 Sep 2020 403rd Frowny 908 432 33ms 13 May 2021 404th okhoel 🇳🇴 908 439 255ms 21 Sep 2022 405th DynamiteBear 908 452 10ms 24 Nov 2022 405th minhtrancccp 908 452 10ms 2 Oct 2023 405th blaztoma 🇱🇹 908 452 10ms 22 Sep 2025 405th ahmetdemirag 🇨🇾 908 452 11ms 3 Oct 2025 409th DialFrost 🇸🇬 907 354 6ms 21 Jan 2025 410th olivermrose 🇺🇸 907 444 1,269ms 28 Oct 2021 411th cywong-amino 🇭🇰 907 449 11ms 7 Oct 2020 412th BlankSpruce 907 466 439ms 27 Nov 2024 413th Steffan153 🇫🇮 907 475 113ms 29 Mar 2023 414th saracen 907 509 289ms 7 Dec 2020 415th Shanethegamer 🇺🇸 907 523 25ms 28 Dec 2022 416th SirBogman 🇺🇸 906 433 33ms 16 Apr 2022 417th hasan1st 906 440 223ms 16 Jun 2022 418th BlankSpruce 906 450 10ms 27 Aug 2024 419th kg583 🇺🇸 906 453 10ms 17 Nov 2022 419th albanian-laundromat 906 453 10ms 11 Nov 2025 419th sudhackar 906 453 10ms 26 Feb 2026 422nd namelessiw 906 468 375ms 26 Oct 2024 423rd yanqui-uxo 906 491 134ms 5 Sep 2018 424th h3ra993huskp 🇯🇵 906 504 488ms 30 Nov 2025 425th dokutan 906 546 76ms 61 mins ago 426th Salutations45 905 450 10ms 26 Dec 2024 427th CaedenHarper 🇨🇦 905 464 967ms 6 Sep 2025 428th marcus-gomes-v 🇧🇷 904 355 6ms 14 Dec 2021 429th janlelis 904 431 31ms 2 Feb 2021 429th olivermrose 🇺🇸 904 431 37ms 27 Aug 2021 429th ovs-code 🇩🇪 904 431 33ms 16 Mar 2024 432nd jasonphicks 904 441 230ms 9 Jun 2020 433rd orthoplex 🇨🇽 904 454 10ms 14 Jan 2022 433rd paralysedforce 904 454 9ms 7 Aug 2023 433rd aditya-u 904 454 9ms 6 Jul 2024 433rd Emutis 🇱🇹 904 454 10ms 26 Dec 2024 433rd Kyogre-Primal 🇺🇦 904 454 10ms 16 May 2025 433rd zhaohm14 904 454 10ms 16 May 2025 439th sean-niemann 🇺🇸 904 469 366ms 30 Oct 2024 440th Shanethegamer 🇺🇸 904 477 108ms 31 Oct 2024 441st frosster 🇨🇦 904 484 1ms 22 Jan 2026 442nd timvermeulen 904 511 168ms 4 Jan 2020 443rd KrausRaus 🇺🇸 903 451 10ms 18 Dec 2022 443rd apreg 903 451 11ms 20 May 2023 443rd snoozingnewt 🇨🇦 903 451 12ms 13 Oct 2025 446th primo-ppcg 🇹🇭 903 485 1ms 5 Oct 2020 447th dokutan 903 492 2ms 30 Nov 2025 448th primo-ppcg 🇹🇭 903 506 428ms 1 Aug 2021 449th nwellnhof 🇩🇪 903 511 304ms 9 Oct 2020 449th kkoenig 903 511 291ms 7 Sep 2025 451st dwayneparton 902 432 37ms 6 May 2020 451st tatzyr 🇯🇵 902 432 35ms 18 Nov 2024 453rd GrayJoKing 🇦🇺 902 445 453ms 16 Jan 2024 453rd m-tkach 🇺🇦 902 445 447ms 21 Jan 2024 453rd MeWhenI 🇻🇦 902 445 501ms 24 May 2024 453rd error256 902 445 498ms 12 Aug 2024 457th myfatemi04 902 455 10ms 1 Mar 2018 457th neihousaigaai 902 455 10ms 26 Dec 2021 457th AlephSquirrel 902 455 9ms 7 Jan 2023 457th SubsTheTechnomancer 902 455 11ms 28 Feb 2023 457th chartung17 902 455 11ms 31 Dec 2023 457th neel11235813 902 455 10ms 26 Mar 2024 457th FranklinJiaChen 902 455 9ms 12 Jun 2024 457th souta-1326 902 455 11ms 27 Mar 2025 457th Baroniket 902 455 10ms 13 Aug 2025 466th inventshah 902 473 2ms 19 Aug 2023 467th btjones0 902 512 161ms 26 Dec 2020 467th MeWhenI 🇻🇦 902 512 269ms 26 Aug 2023 469th REOScotte 901 442 287ms 12 Jan 2026 470th BBoehm 🇩🇪 901 452 11ms 11 Feb 2021 470th dwayneparton 901 452 10ms 8 Sep 2021 470th uttumuttu 🇫🇮 901 452 10ms 4 Jan 2022 473rd sean-niemann 🇺🇸 901 469 576ms 11 Nov 2025 474th MCausc78 🇺🇦 901 494 300ms 5 Jan 2023 475th NewDefectus 🇮🇱 900 456 9ms 8 Nov 2020 475th yanjs 900 456 9ms 1 Oct 2021 475th Irratix 🇳🇱 900 456 9ms 29 Apr 2022 475th stefangimmillaro 900 456 11ms 18 Nov 2022 475th GolfingSuccess 🇬🇷 900 456 10ms 25 Dec 2023 475th InigoK 🇺🇸 900 456 10ms 10 Oct 2025 First Prev 401–480 of 4,081 Next Last
