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 chars. 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 Chars Time Submitted 400th Bubbler-4 748 408 2ms 19 Jan 2022 402nd Irratix 🇳🇱 747 253 11ms 7 May 2022 403rd error256 746 267 7ms 23 Jul 2024 404th XenThe 🇬🇧 745 289 11ms 17 Jul 2025 405th Attero 🇸🇪 744 254 29ms 25 Sep 2020 405th GolfingSuccess 🇬🇷 744 254 10ms 29 Oct 2020 407th Shanethegamer 🇺🇸 744 470 1,023ms 8 Sep 2021 408th SirBogman 🇺🇸 743 400 285ms 23 May 2020 409th MeWhenI 🇻🇦 743 415 467ms 5 Sep 2022 410th lucasvazq 🇦🇷 741 255 10ms 20 Mar 2022 410th jz268 741 255 10ms 6 Jul 2022 412th dokutan 741 274 1,199ms 30 Aug 2025 412th AnAwesomGuy 741 274 1,084ms 17 Sep 2025 414th apreg 739 477 2ms 31 May 2023 415th ludwig-n 738 256 9ms 7 Apr 2021 415th inventshah 738 256 13ms 24 Jan 2023 417th ThePSAdmin 736 251 289ms 6 Jun 2020 418th andersk 🇺🇸 736 257 10ms 26 Mar 2020 418th Fishron 736 257 10ms 28 Dec 2021 418th jeff-at-tamer-dot-codes 🇺🇸 736 257 11ms 31 May 2023 418th jatloe 736 257 10ms 23 Oct 2024 418th KatieLG 🇬🇧 736 257 10ms 17 Jan 2026 423rd jared-hughes 736 479 2ms 17 Jul 2022 424th jakobkordez 🇸🇮 733 258 10ms 19 Oct 2022 424th ehulinsky 🇺🇸 733 258 10ms 9 May 2023 426th GolfingSuccess 🇬🇷 732 253 393ms 25 Jan 2025 427th AnAwesomGuy 732 328 2,607ms 17 Sep 2025 428th dokutan 731 539 1ms 27 Feb 2025 429th joshmoody24 730 259 11ms 14 Mar 2022 430th sean-niemann 🇺🇸 728 214 5ms 30 May 2025 431st 4hg 🇺🇸 727 254 35ms 27 Dec 2022 431st DialFrost 🇸🇬 727 254 35ms 26 Jan 2023 433rd urojony 🇵🇱 727 260 10ms 27 May 2021 433rd annaproxy 727 260 10ms 31 Oct 2021 433rd Just4FunCoder 727 260 11ms 26 Oct 2022 433rd cefqrn 727 260 10ms 27 Dec 2022 433rd FortuiteMan 🇫🇷 727 260 10ms 11 Sep 2023 433rd eiburns 727 260 10ms 9 Oct 2023 433rd iliaspapa 727 260 10ms 10 Dec 2025 440th KrausRaus 🇺🇸 727 296 9ms 2 Sep 2020 441st MeWhenI 🇻🇦 727 481 1,021ms 29 May 2023 442nd BREMAUCY 🇫🇷 727 798 11ms 26 Aug 2025 443rd dokutan 726 268 142ms 19 Oct 2024 444th rak1507 🇬🇧 724 261 11ms 15 Oct 2020 445th dokutan 724 287 40ms 6 Oct 2024 446th dokutan 722 262 761ms 10 Dec 2025 447th GrayJoKing 🇦🇺 722 441 4ms 5 Jun 2021 448th dokutan 721 256 36ms 23 Apr 2025 449th yzhs 🇩🇪 721 262 10ms 25 Oct 2020 449th jacklynnepenick 721 262 10ms 14 Aug 2021 449th keegan-t 🇨🇦 721 262 10ms 20 Apr 2025 449th RaBa21 🇭🇺 721 262 10ms 21 Jul 2025 453rd bbakersmith 721 485 15ms 26 Jul 2021 454th emgordon154 720 214 39ms 10 Nov 2025 454th plcc0 720 214 50ms 31 Jan 2026 456th emgordon154 720 623 2ms 9 Jun 2025 457th HumanEquivalentUnit 719 257 315ms 28 Aug 2020 458th liamLatour 719 263 9ms 3 Aug 2024 459th KatieLG 🇬🇧 718 258 427ms 28 Oct 2024 460th MeWhenI 🇻🇦 716 215 42ms 28 Jul 2022 461st CarsonChr 🇺🇸 716 264 10ms 17 Sep 2022 462nd jaredtrh 711 266 11ms 12 Sep 2021 462nd elgan65536 🇺🇸 711 266 10ms 15 Apr 2024 462nd amberzit 711 266 10ms 3 Jul 2025 462nd luuumine 🇫🇷 711 266 10ms 23 Nov 2025 466th sean-niemann 🇺🇸 710 430 2ms 3 Jan 2024 466th neel11235813 710 430 2ms 26 Mar 2024 468th MeWhenI 🇻🇦 706 499 2ms 17 Nov 2023 469th TeddyWoodburn 705 268 117ms 7 Oct 2024 470th WillConker 705 500 2ms 16 Jul 2023 471st HumanoidCPU 704 262 35ms 1 Aug 2024 472nd giacomogallina 703 269 10ms 15 Jun 2019 472nd HumanoidCPU 703 269 10ms 9 May 2024 472nd Trildcookie 703 269 10ms 23 Dec 2025 475th SubsTheTechnomancer 703 434 2ms 10 Mar 2023 475th snoozingnewt 🇨🇦 703 434 2ms 2 Jun 2024 477th GitMensch 703 825 12ms 29 Nov 2024 478th dokutan 702 387 5ms 15 Apr 2025 479th kapott 🇳🇱 701 307 9ms 11 Jan 2021 480th stefangimmillaro 701 349 412ms 13 Aug 2023 First Prev 401–480 of 4,056 Next Last
