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 239th stefangimmillaro 896 424 35ms 3 Jun 2025 242nd HumanEquivalentUnit 896 435 277ms 12 Jan 2022 243rd janbehrens 🇩🇪 896 442 5ms 3 Jul 2023 244th janbehrens 🇩🇪 896 448 10ms 17 Jun 2023 245th sean-niemann 🇺🇸 896 456 2ms 13 Nov 2024 246th ovs-code 🇩🇪 895 434 4ms 5 Oct 2024 247th janbehrens 🇩🇪 895 448 272ms 3 Jul 2023 248th snoozingnewt 🇨🇦 895 464 84ms 4 Feb 2026 249th the-zammers 895 483 121ms 10 Nov 2023 249th tobeannouncd 895 483 122ms 1 Jan 2024 251st prplz 🇦🇺 895 518 58ms 13 Jul 2021 252nd SirBogman 🇺🇸 894 344 5ms 29 Jan 2021 252nd Rhinozz 🇨🇦 894 344 6ms 21 Aug 2021 252nd Steffan153 🇫🇮 894 344 5ms 15 Feb 2023 252nd BREMAUCY 🇫🇷 894 344 6ms 5 Jun 2025 256th MeWhenI 🇻🇦 894 446 2ms 13 Mar 2025 257th cywong-amino 🇭🇰 894 449 11ms 7 Oct 2020 258th MeWhenI 🇻🇦 894 465 420ms 19 Jun 2025 259th raphaelimahorn 894 501 408ms 17 days ago 260th Skepfyr 894 505 156ms 4 Jan 2020 260th BlankSpruce 894 505 136ms 25 Nov 2024 262nd lynn 893 452 156ms 17 May 2021 263rd lynn 893 465 1,304ms 30 Nov 2021 263rd primo-ppcg 🇹🇭 893 465 1,325ms 30 Nov 2021 265th chordowl 893 484 124ms 17 Mar 2021 266th stefangimmillaro 893 504 290ms 9 Sep 2023 267th sean-niemann 🇺🇸 892 435 1ms 30 Oct 2024 268th jborean93 892 437 257ms 4 Jun 2020 268th cmkb3 892 437 263ms 28 Nov 2023 268th realslacker 892 437 255ms 25 Mar 2024 271st Salutations45 892 450 10ms 26 Dec 2024 272nd edsrzf 🇳🇿 892 486 6ms 15 days ago 273rd Liibe 892 502 458ms 25 Sep 2025 273rd stefangimmillaro 892 502 480ms 6 Oct 2025 275th SirBogman 🇺🇸 892 515 40ms 1 Jun 2024 276th BlankSpruce 892 562 1,627ms 15 Sep 2025 277th sisyphus-ppcg 🇦🇺 891 345 5ms 4 Mar 2022 278th DialFrost 🇸🇬 891 450 493ms 21 May 2024 279th RussellEmerine 891 485 119ms 1 Dec 2019 280th kaascevich 891 486 122ms 8 Jul 2025 281st GrayJoKing 🇦🇺 890 427 34ms 29 Mar 2021 281st sean-niemann 🇺🇸 890 427 38ms 3 Jan 2024 283rd MeWhenI 🇻🇦 890 435 1,263ms 31 Mar 2022 284th RichUncleCody 890 438 268ms 4 Jun 2020 284th sultan 890 438 291ms 5 Jun 2022 286th KrausRaus 🇺🇸 890 451 10ms 18 Dec 2022 286th apreg 890 451 11ms 20 May 2023 286th snoozingnewt 🇨🇦 890 451 12ms 13 Oct 2025 289th Helam24 890 487 113ms 20 Jan 2020 290th Yewzir 🇧🇪 890 563 1,730ms 1 Jun 2024 291st KrausRaus 🇺🇸 889 479 1ms 23 Oct 2023 292nd Ripick 889 484 310ms 15 Jul 2024 293rd exodrifter 🇺🇸 889 486 111ms 25 Oct 2022 293rd HolmDev 889 486 119ms 4 Sep 2025 295th MeWhenI 🇻🇦 889 756 114ms 11 Apr 2024 296th gilufin 888 428 36ms 31 May 2021 297th okhoel 🇳🇴 888 439 255ms 21 Sep 2022 298th MeWhenI 🇻🇦 888 450 1,186ms 29 Aug 2025 299th BBoehm 🇩🇪 888 452 11ms 11 Feb 2021 299th dwayneparton 888 452 10ms 8 Sep 2021 299th uttumuttu 🇫🇮 888 452 10ms 4 Jan 2022 302nd namelessiw 888 468 375ms 26 Oct 2024 303rd h3ra993huskp 🇯🇵 888 504 488ms 30 Nov 2025 304th emgordon154 887 394 41ms 10 Nov 2025 305th GolfingSuccess 🇬🇷 887 438 5ms 16 Aug 2024 305th MeWhenI 🇻🇦 887 438 4ms 16 Aug 2024 307th Shanethegamer 🇺🇸 887 452 282ms 28 Dec 2023 308th textninja 886 429 35ms 26 Sep 2020 309th anter69 🇭🇺 886 437 1,285ms 11 Feb 2026 310th hasan1st 886 440 223ms 16 Jun 2022 311th lacroixjonathan87 886 447 4ms 4 Aug 2020 312th jared-hughes 886 453 11ms 28 Mar 2022 312th madeforlosers 886 453 9ms 8 Nov 2023 314th GrayJoKing 🇦🇺 886 461 2ms 12 Sep 2022 315th sean-niemann 🇺🇸 886 469 366ms 30 Oct 2024 316th plcc0 885 395 44ms 8 Apr 2025 317th MeWhenI 🇻🇦 885 404 2ms 19 Jan 2022 317th SirBogman 🇺🇸 885 404 2ms 3 Nov 2022 319th GrayJoKing 🇦🇺 885 456 4ms 22 Aug 2023 320th primo-ppcg 🇹🇭 885 506 428ms 1 Aug 2021 First Prev 241–320 of 4,083 Next Last
