The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. 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 481st marcus-gomes-v 🇧🇷 866 355 6ms 14 Dec 2021 482nd revlayle 🇺🇸 866 480 374ms 31 May 2022 483rd user189032 866 499 124ms 29 May 2019 484th inventshah 866 508 61ms 16 Sep 2023 485th KatieLG 🇬🇧 866 528 2ms 6 Mar 2021 486th kusune 🇯🇵 865 412 2ms 29 Sep 2023 487th AnAwesomGuy 865 462 1,139ms 17 Sep 2025 488th didion0 🇺🇸 865 464 9ms 8 Jan 2021 488th CatsAreFluffy 865 464 9ms 18 Dec 2022 488th iliazeus 865 464 10ms 10 Mar 2023 488th owen-c-parker 🇺🇸 865 464 8ms 29 Mar 2023 488th crammond 865 464 9ms 14 Aug 2023 488th Maznek 865 464 8ms 27 Dec 2023 488th thadeucity 865 464 8ms 23 May 2025 488th alexsave 865 464 9ms 16 Sep 2025 496th sean-niemann 🇺🇸 865 469 576ms 11 Nov 2025 497th dokutan 865 492 2ms 30 Nov 2025 498th MeWhenI 🇻🇦 865 522 204ms 13 Nov 2022 498th vidanm 🇫🇷 865 522 196ms 11 Jun 2025 500th MeWhenI 🇻🇦 865 531 40ms 3 Jul 2023 501st GolfingSuccess 🇬🇷 864 370 10ms 11 Mar 2025 502nd SephQ 864 440 34ms 31 Dec 2020 502nd JRaspass 🇬🇧 864 440 36ms 18 Jan 2023 504th MeWhenI 🇻🇦 864 444 157ms 3 Aug 2024 505th inventshah 864 473 2ms 19 Aug 2023 506th tomh1012 864 481 421ms 3 Dec 2025 507th sean-niemann 🇺🇸 864 482 1ms 16 Jan 2022 508th yzhs 🇩🇪 864 500 123ms 24 Jul 2021 509th nwellnhof 🇩🇪 864 509 62ms 9 Jan 2022 510th GinjaNinja32 864 523 207ms 16 Apr 2020 511th primo-ppcg 🇹🇭 863 413 2ms 9 Nov 2021 512th BlankSpruce 863 450 10ms 27 Aug 2024 513th thantos 863 465 8ms 21 Feb 2018 513th m1el 863 465 9ms 28 Aug 2020 513th CaedenHarper 🇨🇦 863 465 9ms 6 Sep 2025 516th Shanethegamer 🇺🇸 863 473 2,585ms 31 Oct 2024 517th Attero 🇸🇪 863 519 446ms 1 May 2020 518th kg583 🇺🇸 862 450 492ms 5 Feb 2026 519th JesperJ 862 452 258ms 9 Jun 2020 519th rvdnieuwendijk 🇳🇱 862 452 283ms 23 Oct 2020 519th IISResetMe 862 452 262ms 21 Dec 2025 522nd Attero 🇸🇪 862 459 5ms 25 Sep 2023 523rd Giga-Bowser 862 466 9ms 4 Jan 2022 523rd draem 862 466 10ms 31 Jul 2024 523rd c-py 862 466 9ms 1 Nov 2025 523rd tomh1012 862 466 10ms 3 Dec 2025 523rd egertaia 862 466 9ms 9 Jan 2026 528th jws305 862 482 381ms 21 Nov 2021 528th RainOrigami 🇩🇪 862 482 382ms 21 Dec 2021 530th speles 🇺🇦 862 483 1ms 29 Oct 2023 531st albanian-laundromat 862 522 293ms 4 Dec 2025 532nd dokutan 862 546 76ms 2 days ago 533rd CaedenHarper 🇨🇦 861 464 1,144ms 6 Sep 2025 534th sean-niemann 🇺🇸 861 495 1ms 14 Jul 2025 535th janAkali 🇷🇺 861 500 127ms 7 Oct 2024 536th strout 861 502 121ms 15 Aug 2022 537th MWI-polygolf 861 503 100ms 6 Dec 2023 538th sean-niemann 🇺🇸 861 511 56ms 17 Jan 2022 539th GrayJoKing 🇦🇺 860 404 140ms 8 Dec 2020 540th SubsTheTechnomancer 860 442 35ms 3 Mar 2023 540th snoozingnewt 🇨🇦 860 442 34ms 23 Sep 2023 542nd Natanaelel 🇸🇪 860 467 9ms 11 Sep 2021 542nd SirBogman 🇺🇸 860 467 9ms 10 Dec 2021 542nd GeorgeStechman 🇬🇧 860 467 10ms 20 Sep 2022 542nd DayDun 🇸🇪 860 467 9ms 19 Jan 2023 542nd strattonwhisler 860 467 10ms 27 Mar 2025 542nd Andrey-Plotnikov 860 467 9ms 27 Jun 2025 542nd Yax42 🇫🇷 860 467 9ms 13 Feb 2026 549th Shanethegamer 🇺🇸 860 469 160ms 28 Jul 2021 550th Shanethegamer 🇺🇸 860 472 530ms 31 Oct 2024 551st MeWhenI 🇻🇦 860 475 2,925ms 24 Oct 2024 552nd jahakari 860 483 389ms 21 Nov 2021 552nd SmartK8 🇨🇿 860 483 423ms 30 Oct 2022 552nd DialFrost 🇸🇬 860 483 82ms 19 Feb 2025 555th Shanethegamer 🇺🇸 860 525 183ms 11 Dec 2022 556th iznax 859 484 389ms 21 Nov 2021 556th leth4 859 484 375ms 5 Jul 2023 558th CaedenHarper 🇨🇦 859 521 485ms 10 Oct 2025 559th msbranicky 859 526 199ms 6 Oct 2023 559th dokutan 859 526 130ms 17 Oct 2024 First Prev 481–560 of 4,086 Next Last
