The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 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 721st MahlerFive 🇨🇦 843 534 293ms 22 Apr 2020 722nd dbdr 843 536 128ms 5 Jan 2020 722nd deltaphc 843 536 134ms 7 Jan 2020 722nd fantaize 843 536 157ms 20 days ago 725th denniskoch 842 463 233ms 3 Jun 2020 725th clemmesserli 842 463 233ms 19 Jun 2022 727th Re-Adventures 🇮🇳 842 477 10ms 5 Oct 2020 727th zakariamouhid 842 477 11ms 18 May 2023 727th dacoconutchemist 842 477 10ms 29 May 2024 727th tomavc 842 477 10ms 23 Jun 2025 731st 386asm 🇺🇸 841 400 51ms 24 Apr 2023 732nd biinari 841 452 36ms 27 Mar 2018 733rd dokutan 841 477 258ms 19 Jun 2024 734th dokutan 841 494 405ms 30 Nov 2025 735th KasperKivimaeki 🇫🇮 841 495 3ms 21 Apr 2025 736th MasterBel2 841 515 102ms 7 Jun 2020 737th ListeriaM 841 523 446ms 20 Aug 2023 738th GinjaNinja32 841 535 300ms 16 Apr 2020 738th janbehrens 🇩🇪 841 535 300ms 20 Jun 2021 738th Shanethegamer 🇺🇸 841 535 297ms 31 Oct 2024 741st lynn 840 447 34ms 3 Apr 2021 742nd jhoneill 840 464 257ms 5 Jun 2020 743rd dscholtz-lab49 840 478 10ms 19 May 2023 744th Seanharrs 🇦🇺 840 495 416ms 15 Feb 2023 744th arctouch-cristiannevianna 840 495 426ms 7 Jun 2023 746th perfunction 840 516 99ms 20 Jan 2020 747th snoozingnewt 🇨🇦 840 543 31ms 15 Oct 2025 748th SirBogman 🇺🇸 839 414 142ms 5 Oct 2020 749th felixli1998 839 453 37ms 8 Aug 2024 750th demacus 839 472 5ms 2 Nov 2023 750th targrik 839 472 5ms 21 Oct 2025 752nd primo-ppcg 🇹🇭 839 496 1ms 10 Sep 2019 753rd deerawj 839 538 157ms 7 Apr 2024 754th retrohun 838 425 2ms 25 Sep 2022 755th retrohun 838 476 4ms 20 Dec 2023 756th alasdair-greenland 838 479 10ms 12 Nov 2021 756th ollyspooner 838 479 10ms 22 Sep 2023 756th HumanoidCPU 838 479 10ms 5 May 2024 756th Ralac07 🇦🇺 838 479 10ms 18 Apr 2025 756th amazingalek 🇳🇴 838 479 10ms 26 Dec 2025 761st dokutan 838 484 485ms 27 Dec 2025 762nd danieldooley 838 537 305ms 21 Apr 2020 763rd 4hg 🇺🇸 837 454 35ms 27 Dec 2022 763rd TheZwierzLF 🇵🇱 837 454 35ms 25 Dec 2025 765th CaedenHarper 🇨🇦 837 463 411ms 5 Sep 2024 766th dokutan 837 482 166ms 17 Oct 2024 767th shanthangolden 🇬🇧 837 496 85ms 18 Feb 2026 768th languidlizard28 837 509 2ms 3 Jan 2021 768th Shanethegamer 🇺🇸 837 509 2ms 22 Apr 2023 768th adriweb 🇫🇷 837 509 1ms 1 Jan 2024 771st snyderek 🇺🇸 837 526 74ms 27 Dec 2024 772nd emgordon154 836 463 1,334ms 21 Jul 2024 773rd KatieLG 🇬🇧 836 464 468ms 12 Jun 2024 773rd alphafalfa 836 464 1ms 16 Apr 2025 775th joalcorn 836 466 261ms 5 Aug 2024 776th LoLoLucky 836 480 9ms 7 Dec 2020 777th MeWhenI 🇻🇦 836 517 118ms 17 Sep 2024 778th timvermeulen 836 518 96ms 19 Jan 2020 778th dev-Thae 836 518 79ms 6 Nov 2023 780th TheWhoAreYouPerson 836 540 154ms 4 Jan 2020 780th CatsAreFluffy 836 540 148ms 25 Nov 2024 782nd jvdp1 836 549 40ms 24 Dec 2020 782nd stefangimmillaro 836 549 41ms 31 May 2025 784th acornellier 835 455 36ms 1 Dec 2021 785th anders-nom 835 481 13ms 15 Jan 2020 786th Arkadios200 835 519 107ms 31 Dec 2025 787th dokutan 834 464 1,266ms 21 Apr 2025 788th SirBogman 🇺🇸 834 465 453ms 15 Jan 2024 789th Yewzir 🇧🇪 834 484 154ms 27 Mar 2024 790th RatajVaver 834 511 1ms 2 Jun 2020 790th MeWhenI 🇻🇦 834 511 1ms 20 Feb 2023 792nd neel11235813 834 547 25ms 12 Jan 2023 792nd aviyanp 834 547 26ms 15 Oct 2025 794th proton 🇩🇪 833 456 37ms 9 Jun 2020 795th mcapodici 833 482 9ms 10 Aug 2020 795th piano-miles 833 482 10ms 12 Mar 2023 797th KatieLG 🇬🇧 833 499 405ms 15 Feb 2022 798th Servus7 🇩🇪 833 520 98ms 17 Jul 2023 799th NoUselessTech 833 542 140ms 20 Dec 2022 799th aumptl 🇦🇺 833 542 141ms 13 Nov 2024 First Prev 721–800 of 4,086 Next Last
