The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
12 Days of Christmas in Python 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 GWStuart 396 482 10ms 26 Nov 2021 400th lostMia 396 482 10ms 11 Jun 2023 400th raspofabs 396 482 10ms 8 Jul 2023 400th Mathrew2012 396 482 10ms 16 Aug 2024 400th RedzGoose 🇦🇺 396 482 10ms 13 Oct 2024 406th hymanimy 395 483 9ms 24 Aug 2021 406th jrm5399 🇰🇿 395 483 10ms 31 Jan 2022 406th S-Ruban 395 483 11ms 26 Feb 2023 406th leonw774 395 483 10ms 24 Oct 2023 406th thomas-saigre 395 483 9ms 24 Jan 2024 406th OCNeve 395 483 9ms 17 Jun 2024 406th madex 🇩🇪 395 483 10ms 19 Dec 2024 406th AidanWalter 395 483 10ms 31 Dec 2024 406th jamiloBBKing 395 483 10ms 14 Apr 2025 406th jumpingtj 395 483 10ms 116 mins ago 416th GoodClover 🇬🇧 395 484 10ms 11 Nov 2020 416th PatrickStephansen 🇿🇦 395 484 10ms 10 Dec 2021 416th Fanrco 395 484 10ms 31 Aug 2023 416th inverseLorentz 🇦🇺 395 484 9ms 21 May 2024 416th matsagad 395 484 11ms 12 Dec 2024 416th syyynth 395 484 10ms 20 Oct 2025 422nd bkshrader 394 485 9ms 11 Jan 2019 422nd Andrey135296 394 485 9ms 2 Jan 2022 422nd ballaire 394 485 9ms 21 Jan 2024 425th abailey2020 🇺🇸 393 486 10ms 26 Dec 2020 425th berkott 393 486 9ms 27 Dec 2022 425th en4rab 393 486 10ms 6 May 2023 425th markusgraube 393 486 10ms 8 Mar 2024 425th CodeByAidan 🇺🇸 393 486 10ms 19 Jun 2024 425th gthayden23 393 486 10ms 2 Oct 2024 425th jacekwladzinski 393 486 10ms 8 Oct 2025 425th deancureton 393 486 10ms 17 Dec 2025 433rd 71c 392 487 10ms 8 Mar 2018 433rd alangodfrey 392 487 10ms 6 Mar 2019 433rd Wildst 392 487 9ms 14 Jun 2022 433rd trist224 🇫🇷 392 487 10ms 5 Sep 2022 433rd Ripick 392 487 10ms 30 Dec 2022 433rd jmatko 392 487 10ms 17 Oct 2023 433rd abcdhhhh 392 487 10ms 24 Aug 2024 433rd morphthesworph 392 487 10ms 31 Dec 2025 441st timkaiser 391 488 10ms 18 Apr 2019 441st Nordle 391 488 9ms 28 Feb 2020 441st wrhm 391 488 9ms 12 Dec 2020 441st AkashTandon167 391 488 11ms 25 Jan 2021 441st Omega65536 🇩🇪 391 488 10ms 23 Jun 2021 441st Sturla22 391 488 11ms 4 Apr 2022 441st BrunoVisnadi 🇧🇷 391 488 10ms 3 Oct 2025 441st Code-Coder-coder 391 488 9ms 11 Oct 2025 449th jgermain48 391 489 10ms 8 Dec 2019 450th ly0va 390 490 9ms 7 Jan 2019 450th chrismilson 390 490 10ms 18 May 2020 450th hippopotam00sehead 🇨🇦 390 490 10ms 16 Sep 2024 450th jbjd 390 490 10ms 17 Sep 2024 450th lelbal 390 490 10ms 19 Sep 2024 450th DraigRygbi 390 490 10ms 19 Dec 2024 450th argentite 390 490 10ms 11 Sep 2025 457th mikelane 389 491 10ms 29 Mar 2020 457th Jaydosu 389 491 10ms 22 Oct 2021 457th vishwathg 389 491 10ms 19 Aug 2022 457th grieve 389 491 9ms 9 Jun 2023 457th davidtiemstra 389 491 10ms 11 Jul 2023 457th Itnug 389 491 10ms 19 Jul 2023 457th Glinte 389 491 10ms 29 Dec 2023 457th cthierfelder 🇲🇨 389 491 10ms 5 Sep 2025 465th GreenyNeko 388 492 10ms 24 Jul 2020 465th ydevor 🇮🇱 388 492 10ms 20 Nov 2020 465th michael-alperovich 388 492 9ms 1 Feb 2021 465th richard-oelze 🇩🇪 388 492 10ms 28 Nov 2021 465th MichaelMBradley 🇨🇦 388 492 10ms 5 Apr 2022 465th DragonaireM 388 492 10ms 4 Feb 2023 471st rothos 387 493 10ms 31 Dec 2024 471st M4rc0g1 387 493 11ms 16 Nov 2025 473rd specbug 387 494 10ms 30 Nov 2022 473rd zsimo-lab49 387 494 10ms 15 May 2023 475th evanrittner 386 495 10ms 26 Feb 2021 475th kaptsanovb 386 495 10ms 4 Apr 2022 475th kenny14231 386 495 10ms 5 Aug 2022 475th OrangeBacon 386 495 10ms 31 Jul 2024 475th Unknownuserfrommars 386 495 9ms 7 Oct 2024 480th YoungjuneKwon 385 496 10ms 20 Nov 2020 First Prev 401–480 of 1,167 Next Last
