The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 hours. Why not try and solve them ahead of time?
12 Days of Christmas in Python 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 400th Nordle 389 488 9ms 28 Feb 2020 400th wrhm 389 488 9ms 12 Dec 2020 400th AkashTandon167 389 488 11ms 25 Jan 2021 400th Omega65536 🇩🇪 389 488 10ms 23 Jun 2021 400th Sturla22 389 488 11ms 4 Apr 2022 400th HumanoidCPU 389 488 11ms 26 Mar 2024 400th BrunoVisnadi 🇧🇷 389 488 10ms 3 Oct 2025 400th Code-Coder-coder 389 488 9ms 11 Oct 2025 409th jgermain48 389 489 10ms 8 Dec 2019 410th ly0va 388 490 9ms 7 Jan 2019 410th chrismilson 388 490 10ms 18 May 2020 410th Jacob385 388 490 10ms 13 Mar 2024 410th rucin93 🇵🇱 388 490 9ms 26 Jul 2024 410th hippopotam00sehead 🇨🇦 388 490 10ms 16 Sep 2024 410th jbjd 388 490 10ms 17 Sep 2024 410th lelbal 388 490 10ms 19 Sep 2024 410th DraigRygbi 388 490 10ms 19 Dec 2024 410th argentite 388 490 10ms 11 Sep 2025 419th mikelane 387 491 10ms 29 Mar 2020 419th Jaydosu 387 491 10ms 22 Oct 2021 419th vishwathg 387 491 10ms 19 Aug 2022 419th grieve 387 491 9ms 9 Jun 2023 419th davidtiemstra 387 491 10ms 11 Jul 2023 419th Itnug 387 491 10ms 19 Jul 2023 419th Glinte 387 491 10ms 29 Dec 2023 419th fkantelberg 387 491 11ms 15 Jul 2025 419th cthierfelder 🇲🇨 387 491 10ms 5 Sep 2025 419th Matter1024 🇮🇳 387 491 10ms 9 days ago 429th GreenyNeko 386 492 10ms 24 Jul 2020 429th ydevor 🇮🇱 386 492 10ms 20 Nov 2020 429th michael-alperovich 386 492 9ms 1 Feb 2021 429th richard-oelze 🇩🇪 386 492 10ms 28 Nov 2021 429th MichaelMBradley 🇨🇦 386 492 10ms 5 Apr 2022 429th P-Quentin 🇫🇷 386 492 10ms 3 Aug 2022 429th DragonaireM 386 492 10ms 4 Feb 2023 429th ocean0821 386 492 10ms 7 May 2025 437th bthalheim 385 493 10ms 1 Aug 2022 437th TeddyWoodburn 385 493 29ms 6 Oct 2024 437th rothos 385 493 10ms 31 Dec 2024 437th M4rc0g1 385 493 11ms 16 Nov 2025 441st schachmattmatt 385 494 10ms 11 Aug 2021 441st specbug 385 494 10ms 30 Nov 2022 441st zsimo-lab49 385 494 10ms 15 May 2023 444th evanrittner 384 495 10ms 26 Feb 2021 444th Re-Adventures 🇮🇳 384 495 9ms 29 Mar 2021 444th kaptsanovb 384 495 10ms 4 Apr 2022 444th kenny14231 384 495 10ms 5 Aug 2022 444th OrangeBacon 384 495 10ms 31 Jul 2024 444th Unknownuserfrommars 384 495 9ms 7 Oct 2024 450th YoungjuneKwon 383 496 10ms 20 Nov 2020 450th asheeri 383 496 10ms 15 Aug 2021 450th ZakkkkAttackkkk 🇵🇭 383 496 30ms 25 Dec 2021 450th try-except-try-accept 🇹🇭 383 496 9ms 9 Jul 2022 450th ramsay 383 496 10ms 8 Aug 2022 450th jeaosh 383 496 10ms 22 Oct 2022 450th Starwort 🇬🇧 383 496 11ms 4 Dec 2022 450th fenix-bear 383 496 10ms 3 Jul 2023 450th htareque 383 496 30ms 18 Oct 2023 450th khavik 383 496 10ms 11 May 2024 450th yashima 383 496 9ms 4 Nov 2024 450th bogosorter 383 496 10ms 9 Jul 2025 450th celiendonze 🇨🇭 383 496 10ms 18 Dec 2025 463rd btjones0 382 497 10ms 26 Dec 2020 463rd vezzick 382 497 10ms 7 Mar 2021 463rd kaylacomer 382 497 10ms 24 Oct 2021 463rd MCausc78 🇺🇦 382 497 10ms 5 Jan 2023 463rd ZoeyKD 382 497 9ms 14 May 2023 463rd xoxo-ily 382 497 10ms 12 Dec 2023 463rd aloobun 382 497 10ms 2 Dec 2024 470th SimonPeatman 382 498 10ms 29 Dec 2018 470th Arkaedan 382 498 9ms 27 Jul 2020 470th cesarm4 382 498 10ms 30 Aug 2021 470th GeneralTwi 382 498 10ms 4 May 2022 470th n0es 382 498 10ms 6 Oct 2022 470th saoudi-h 382 498 10ms 12 Jan 2023 470th adamnielson42 🇺🇸 382 498 9ms 30 May 2023 470th ArchFin 382 498 9ms 21 Nov 2024 470th GeneralFabian 382 498 31ms 14 Dec 2024 470th energee 382 498 10ms 19 Dec 2024 470th Europe2048 382 498 9ms 17 Sep 2025 First Prev 401–480 of 1,171 Next Last
