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 561st dsntzn 🇸🇰 858 468 9ms 9 Aug 2020 561st lowlighter 858 468 10ms 30 Oct 2020 561st SpareManiKatti 858 468 10ms 11 Sep 2021 561st akshatj27 🇦🇶 858 468 13ms 11 Jan 2022 561st pineapplebox 858 468 10ms 11 Feb 2022 561st Cazka 858 468 10ms 12 Feb 2022 561st BambooleanLogic 🇸🇪 858 468 11ms 19 Oct 2023 561st JOrE20 858 468 11ms 30 Jan 2026 569th sean-niemann 🇺🇸 858 476 2,632ms 11 Nov 2025 570th nwellnhof 🇩🇪 858 485 1ms 9 Oct 2020 570th inventshah 858 485 1ms 13 Jul 2023 572nd Attero 🇸🇪 858 497 1ms 3 Apr 2020 573rd johnnythedoggie 858 505 99ms 10 Oct 2020 574th ETHproductions 🇺🇸 857 468 309ms 21 Dec 2018 575th MeWhenI 🇻🇦 857 471 4ms 22 May 2023 576th annaproxy 857 485 392ms 5 May 2022 577th MostParsingVex 857 486 1ms 28 Dec 2024 578th msbranicky 857 497 1ms 20 Jan 2025 579th gutierrezm00 856 444 34ms 16 Apr 2020 579th Shanethegamer 🇺🇸 856 444 34ms 28 Jul 2021 581st mintypython 856 469 9ms 19 Oct 2018 581st rexim 856 469 11ms 28 Aug 2020 581st DaCuteRaccoon 856 469 10ms 30 Nov 2022 584th Natanaelel 🇸🇪 856 505 114ms 11 Mar 2022 584th eddiesmithxyz 856 505 120ms 7 Jan 2023 586th eiburns 856 523 547ms 13 Nov 2020 586th Vaekor 856 523 430ms 9 Jul 2023 586th coltraloz 🇪🇸 856 523 399ms 22 Apr 2024 586th snoozingnewt 🇨🇦 856 523 513ms 3 Oct 2025 590th AlephSquirrel 855 453 533ms 22 Jan 2024 591st janbehrens 🇩🇪 855 486 393ms 21 Nov 2021 591st SubsTheTechnomancer 855 486 390ms 28 Feb 2023 591st snoozingnewt 🇨🇦 855 486 404ms 23 Sep 2023 591st neel11235813 855 486 414ms 26 Mar 2024 591st Yax42 🇫🇷 855 486 403ms 24 Nov 2025 596th scottpenn 855 528 132ms 4 Jan 2020 597th UnderKoen 🇳🇱 855 535 2ms 3 Feb 2024 598th DialFrost 🇸🇬 854 445 36ms 1 Jun 2024 599th alexkunin 854 470 10ms 4 Jul 2019 599th guliyevemil1 🇦🇿 854 470 10ms 20 Apr 2020 599th RedstoneTim 854 470 9ms 30 Jun 2021 599th Tejas-H5 854 470 12ms 10 Apr 2022 599th kordrun 854 470 11ms 27 Jun 2022 599th XenThe 🇬🇧 854 470 9ms 25 Dec 2025 605th Sp3000 🇦🇺 854 473 5ms 29 May 2021 606th ovs-code 🇩🇪 854 475 550ms 9 Mar 2022 607th JOrE20 854 506 122ms 1 Nov 2025 608th rowan-OzRunways 854 507 98ms 15 Aug 2020 608th HumanoidCPU 854 507 100ms 5 May 2024 610th GolfingSuccess 🇬🇷 854 515 61ms 25 Dec 2023 611th menglishca 🇨🇦 854 524 422ms 6 Aug 2021 611th ravnskjaer 🇩🇰 854 524 446ms 15 Dec 2025 613th KatieLG 🇬🇧 854 527 331ms 25 Sep 2022 613th kimbo 🇺🇸 854 527 300ms 11 Jan 2023 615th klixel 🇨🇦 854 529 160ms 4 Jun 2023 616th GolfingSuccess 🇬🇷 853 359 42ms 11 Mar 2025 617th northvandrew 853 457 276ms 8 Jun 2020 618th aditsu 853 479 2,652ms 11 Aug 2025 618th dokutan 853 479 2,496ms 29 Aug 2025 620th Timwi 853 487 414ms 4 Dec 2024 621st prplz 🇦🇺 853 516 59ms 4 Jan 2022 622nd janbehrens 🇩🇪 853 525 408ms 17 Jun 2023 623rd kylelemons 853 528 269ms 16 Apr 2020 624th GolfingSuccess 🇬🇷 852 455 448ms 15 Jan 2024 624th snoozingnewt 🇨🇦 852 455 470ms 11 Feb 2024 626th GolfingSuccess 🇬🇷 852 468 168ms 5 Jun 2022 627th pg98 852 471 11ms 14 Mar 2018 627th detrumi 🇳🇱 852 471 244ms 25 Oct 2020 627th hpr 852 471 10ms 12 Jun 2021 627th dylanarmstrong 852 471 12ms 3 Jan 2024 627th Lv0Sys 🇵🇱 852 471 599ms 30 Nov 2025 627th DialFrost 🇸🇬 852 471 10ms 19 Jan 2026 633rd MeWhenI 🇻🇦 852 476 580ms 4 Mar 2022 634th initram 852 488 390ms 21 Nov 2021 634th stefangimmillaro 852 488 421ms 20 Jun 2025 636th SubsTheTechnomancer 852 500 1ms 1 Mar 2023 636th snoozingnewt 🇨🇦 852 500 1ms 23 Sep 2023 636th neel11235813 852 500 1ms 26 Mar 2024 636th synt7x 🇺🇸 852 500 1ms 5 Jul 2025 640th yamhab 🇨🇦 852 530 144ms 13 Sep 2023 First Prev 561–640 of 4,083 Next Last
