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 641st kurkale6ka 851 398 5ms 31 Aug 2021 642nd ovs-code 🇩🇪 851 439 7ms 16 Mar 2023 642nd GolfingSuccess 🇬🇷 851 439 8ms 26 Mar 2023 644th erdnaxeli 🇫🇷 851 455 1,294ms 17 Apr 2021 645th sagarv26 851 458 237ms 11 Jun 2021 646th KrausRaus 🇺🇸 851 465 4ms 18 Jul 2025 647th FrederikHutfless 🇩🇪 851 472 10ms 23 Dec 2022 648th Shanethegamer 🇺🇸 851 480 3ms 22 Mar 2023 648th AnAwesomGuy 851 480 2,761ms 18 Dec 2025 650th EthanSansom 851 488 83ms 17 Oct 2025 651st Irratix 🇳🇱 851 508 116ms 18 Nov 2021 652nd 0xjac 🇨🇭 851 529 304ms 15 Jun 2020 652nd CaedenHarper 🇨🇦 851 529 293ms 20 Nov 2025 654th Michaelncallahan 850 447 30ms 17 Apr 2020 654th Haksell 🇦🇶 850 447 34ms 22 Feb 2023 656th GrayJoKing 🇦🇺 850 463 67ms 17 Oct 2023 657th stellartux 850 472 291ms 25 Dec 2023 658th Andriamanitra 🇫🇮 850 475 4ms 13 Jun 2024 659th lyphyser 850 490 1ms 18 Jun 2023 660th marcin7Cd 849 362 8ms 6 Feb 2021 661st Shanethegamer 🇺🇸 849 456 1,330ms 28 Jul 2021 662nd indented-automation 849 459 267ms 7 May 2024 663rd sethimcclaine 849 473 10ms 5 Apr 2019 663rd MiffOttah 849 473 10ms 11 May 2020 663rd richard-oelze 🇩🇪 849 473 9ms 2 Dec 2020 663rd qpwoeirut 849 473 11ms 11 Oct 2025 667th neel11235813 849 510 90ms 16 Mar 2024 667th snoozingnewt 🇨🇦 849 510 88ms 30 Apr 2024 667th dokutan 849 510 86ms 23 Sep 2024 670th guliyevemil1 🇦🇿 849 530 304ms 16 Apr 2020 671st NewDefectus 🇮🇱 849 546 25ms 1 Sep 2021 672nd lynn 848 412 41ms 16 Oct 2023 673rd blaztoma 🇱🇹 848 448 34ms 13 Oct 2025 674th neel11235813 848 457 504ms 16 Mar 2024 674th Shanethegamer 🇺🇸 848 457 520ms 13 Sep 2024 676th ListeriaM 848 491 1ms 20 Aug 2023 676th GolfingSuccess 🇬🇷 848 491 2ms 25 Dec 2023 678th na0y 848 528 429ms 20 Oct 2021 679th jackkav 847 474 10ms 24 Jun 2018 679th ArmaanAS 847 474 12ms 4 Jul 2021 679th Protothor 847 474 9ms 8 Jun 2025 682nd DaCuteRaccoon 847 533 162ms 2 Oct 2022 682nd wackbyte 847 533 136ms 7 Nov 2023 682nd blaztoma 🇱🇹 847 533 157ms 17 Aug 2025 685th SirBogman 🇺🇸 847 691 12ms 23 Nov 2022 685th frankgraziano 847 691 13ms 9 Feb 2026 687th comp0zr 846 449 38ms 27 Sep 2023 688th primo-ppcg 🇹🇭 846 465 68ms 16 Oct 2023 689th stefangimmillaro 846 489 111ms 28 Nov 2022 690th Shanethegamer 🇺🇸 846 491 423ms 31 Oct 2024 691st prplz 🇦🇺 846 492 1ms 29 Oct 2020 691st lynn 846 492 2ms 21 Oct 2021 691st jupj 🇫🇮 846 492 1ms 19 Sep 2022 694th Shanethegamer 🇺🇸 846 511 133ms 9 Jun 2022 695th fpesce 846 532 290ms 18 Mar 2022 696th 09cf 846 534 128ms 4 Oct 2023 697th dokutan 845 454 125ms 27 Dec 2025 698th Shanethegamer 🇺🇸 845 459 2ms 22 Mar 2023 699th Arkaedan 845 461 275ms 27 Jul 2020 700th alexislours 845 475 10ms 5 Mar 2023 700th chartung17 845 475 10ms 1 Jan 2024 700th thomas-saigre 845 475 296ms 26 Nov 2024 703rd BisheruBlade888 845 521 65ms 6 Jan 2022 703rd ovs-code 🇩🇪 845 521 464ms 8 Jun 2024 705th aspett 844 448 71ms 16 May 2022 706th albanian-laundromat 844 459 446ms 24 Aug 2025 707th Echriser 844 510 294ms 14 Nov 2022 708th ian-h-chamberlain 🇺🇸 844 535 162ms 26 Jul 2022 709th hyvyys 843 476 11ms 18 Sep 2020 709th PatrickStephansen 🇿🇦 843 476 10ms 2 Mar 2021 709th itserasmus 843 476 12ms 25 Jan 2024 709th Moreallure 843 476 10ms 4 May 2024 709th hacker112 🇸🇪 843 476 9ms 17 Jun 2024 709th daniel-michel 843 476 10ms 7 Dec 2024 709th a6166231 🇨🇳 843 476 9ms 20 Jun 2025 716th dokutan 843 485 2ms 21 Apr 2025 717th ovs-code 🇩🇪 843 494 2ms 8 Jun 2024 718th MahlerFive 🇨🇦 843 534 293ms 22 Apr 2020 719th dbdr 843 536 128ms 5 Jan 2020 719th deltaphc 843 536 134ms 7 Jan 2020 First Prev 641–720 of 4,083 Next Last