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 721st Attero 🇸🇪 880 519 446ms 1 May 2020 722nd Shanethegamer 🇺🇸 880 525 183ms 11 Dec 2022 723rd NewDefectus 🇮🇱 880 546 25ms 1 Sep 2021 724th aspett 879 448 71ms 16 May 2022 725th BobbyGerace 879 463 10ms 21 May 2021 725th raphaelimahorn 879 463 10ms 17 Aug 2021 725th olivermrose 🇺🇸 879 463 10ms 10 Oct 2021 725th stefangimmillaro 879 463 9ms 23 Apr 2023 725th ryanocf 879 463 9ms 16 Jan 2024 725th two-bad 🇬🇧 879 463 10ms 3 Feb 2024 725th targrik 879 463 9ms 7 Feb 2025 725th dokutan 879 463 9ms 20 Apr 2025 733rd TheAristos 879 467 11ms 25 Oct 2019 733rd reedwilemon 879 467 9ms 12 Jun 2020 733rd georgehulme 879 467 10ms 26 Jan 2022 733rd SniperSmiley 🇺🇸 879 467 11ms 5 Dec 2022 733rd nstearns96 🇬🇧 879 467 9ms 13 Jan 2023 733rd isorlab49 879 467 10ms 24 May 2023 733rd yzhs 🇩🇪 879 467 9ms 23 Jun 2023 733rd LocNgu 879 467 9ms 13 Jul 2023 733rd CorporalCrawdad 879 467 10ms 5 Sep 2024 733rd andrewjc2000 879 467 10ms 25 Feb 2025 733rd qpwoeirut 879 467 10ms 2 Oct 2025 733rd jet689 879 467 10ms 3 Jan 2026 745th dokutan 879 485 2ms 21 Apr 2025 746th JOrE20 879 506 122ms 1 Nov 2025 747th sean-niemann 🇺🇸 879 511 56ms 17 Jan 2022 748th lynn 878 447 34ms 3 Apr 2021 749th neel11235813 878 457 504ms 16 Mar 2024 749th Shanethegamer 🇺🇸 878 457 520ms 13 Sep 2024 751st jahakari 878 483 389ms 21 Nov 2021 751st SmartK8 🇨🇿 878 483 423ms 30 Oct 2022 751st speles 🇺🇦 878 483 1ms 29 Oct 2023 754th msbranicky 878 526 199ms 6 Oct 2023 754th dokutan 878 526 130ms 17 Oct 2024 756th gutierrezm00 877 444 34ms 16 Apr 2020 756th Shanethegamer 🇺🇸 877 444 34ms 28 Jul 2021 758th didion0 🇺🇸 877 464 9ms 8 Jan 2021 758th CatsAreFluffy 877 464 10ms 18 Dec 2022 758th iliazeus 877 464 10ms 10 Mar 2023 758th owen-c-parker 🇺🇸 877 464 12ms 29 Mar 2023 758th crammond 877 464 9ms 14 Aug 2023 758th Maznek 877 464 11ms 27 Dec 2023 758th thadeucity 877 464 11ms 23 May 2025 758th alexsave 877 464 11ms 16 Sep 2025 766th xorraxrax 877 468 10ms 31 Oct 2019 766th Crambor 877 468 9ms 9 Jan 2020 766th vort3 877 468 10ms 1 May 2020 766th urojony 🇵🇱 877 468 10ms 4 Jan 2021 766th NanduBC 877 468 10ms 14 Mar 2021 766th osmith93 877 468 10ms 31 Jul 2021 766th face0xff 877 468 10ms 28 Dec 2021 766th joshmoody24 877 468 10ms 4 Mar 2022 766th pascscha 877 468 10ms 9 May 2022 766th MaxElf999 877 468 10ms 29 Sep 2022 766th fredrik-bakke 🇳🇴 877 468 30ms 5 Oct 2022 766th za3k 877 468 10ms 12 Oct 2022 766th Troon 877 468 9ms 25 Oct 2022 766th commandz0 🇺🇸 877 468 10ms 21 Nov 2022 766th mathb0y512 877 468 10ms 20 Jan 2023 766th eddvrs 877 468 10ms 22 Dec 2023 766th JorgiEagle 877 468 10ms 8 Feb 2024 766th SB-945 877 468 10ms 17 Apr 2024 766th EnTerr 877 468 10ms 8 Sep 2024 766th lhulinsky 877 468 10ms 31 Oct 2024 766th dokutan 877 468 9ms 20 Apr 2025 766th jtyliu 877 468 9ms 6 Aug 2025 788th retrohun 877 476 4ms 20 Dec 2023 789th CaedenHarper 🇨🇦 877 521 485ms 10 Oct 2025 790th thantos 876 465 13ms 21 Feb 2018 790th m1el 876 465 10ms 28 Aug 2020 790th CaedenHarper 🇨🇦 876 465 10ms 6 Sep 2025 793rd iznax 876 484 389ms 21 Nov 2021 793rd leth4 876 484 375ms 5 Jul 2023 795th Irratix 🇳🇱 876 508 116ms 18 Nov 2021 796th KatieLG 🇬🇧 876 527 331ms 25 Sep 2022 796th kimbo 🇺🇸 876 527 300ms 11 Jan 2023 798th DialFrost 🇸🇬 875 445 36ms 1 Jun 2024 799th albanian-laundromat 875 459 446ms 24 Aug 2025 800th sisyphus-ppcg 🇦🇺 875 469 10ms 11 Nov 2020 First Prev 721–800 of 4,082 Next Last
