The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 43 hours. 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 391st OutWrest 395 481 11ms 42 mins ago 402nd Froststorm 394 482 10ms 8 Oct 2020 402nd GWStuart 394 482 10ms 26 Nov 2021 402nd lostMia 394 482 10ms 11 Jun 2023 402nd raspofabs 394 482 10ms 8 Jul 2023 402nd Mathrew2012 394 482 10ms 16 Aug 2024 402nd RedzGoose 🇦🇺 394 482 10ms 13 Oct 2024 408th hymanimy 393 483 9ms 24 Aug 2021 408th jrm5399 🇰🇿 393 483 10ms 31 Jan 2022 408th S-Ruban 393 483 11ms 26 Feb 2023 408th leonw774 393 483 10ms 24 Oct 2023 408th thomas-saigre 393 483 9ms 24 Jan 2024 408th OCNeve 393 483 9ms 17 Jun 2024 408th madex 🇩🇪 393 483 10ms 19 Dec 2024 408th AidanWalter 393 483 10ms 31 Dec 2024 408th jamiloBBKing 393 483 10ms 14 Apr 2025 408th jumpingtj 393 483 10ms 5 days ago 418th GoodClover 🇬🇧 393 484 10ms 11 Nov 2020 418th PatrickStephansen 🇿🇦 393 484 10ms 10 Dec 2021 418th Fanrco 393 484 10ms 31 Aug 2023 418th inverseLorentz 🇦🇺 393 484 9ms 21 May 2024 418th matsagad 393 484 11ms 12 Dec 2024 418th syyynth 393 484 10ms 20 Oct 2025 424th bkshrader 392 485 9ms 11 Jan 2019 424th Andrey135296 392 485 9ms 2 Jan 2022 424th ballaire 392 485 9ms 21 Jan 2024 427th abailey2020 🇺🇸 391 486 10ms 26 Dec 2020 427th berkott 391 486 9ms 27 Dec 2022 427th en4rab 391 486 10ms 6 May 2023 427th markusgraube 391 486 10ms 8 Mar 2024 427th CodeByAidan 🇺🇸 391 486 10ms 19 Jun 2024 427th gthayden23 391 486 10ms 2 Oct 2024 427th jacekwladzinski 391 486 10ms 8 Oct 2025 427th deancureton 391 486 10ms 17 Dec 2025 435th 71c 390 487 10ms 8 Mar 2018 435th alangodfrey 390 487 10ms 6 Mar 2019 435th Wildst 390 487 9ms 14 Jun 2022 435th trist224 🇫🇷 390 487 10ms 5 Sep 2022 435th Ripick 390 487 10ms 30 Dec 2022 435th jmatko 390 487 10ms 17 Oct 2023 435th abcdhhhh 390 487 10ms 24 Aug 2024 435th morphthesworph 390 487 10ms 31 Dec 2025 443rd timkaiser 389 488 10ms 18 Apr 2019 443rd Nordle 389 488 9ms 28 Feb 2020 443rd wrhm 389 488 9ms 12 Dec 2020 443rd AkashTandon167 389 488 11ms 25 Jan 2021 443rd Omega65536 🇩🇪 389 488 10ms 23 Jun 2021 443rd Sturla22 389 488 11ms 4 Apr 2022 443rd BrunoVisnadi 🇧🇷 389 488 10ms 3 Oct 2025 443rd Code-Coder-coder 389 488 9ms 11 Oct 2025 451st jgermain48 389 489 10ms 8 Dec 2019 452nd ly0va 388 490 9ms 7 Jan 2019 452nd chrismilson 388 490 10ms 18 May 2020 452nd hippopotam00sehead 🇨🇦 388 490 10ms 16 Sep 2024 452nd jbjd 388 490 10ms 17 Sep 2024 452nd lelbal 388 490 10ms 19 Sep 2024 452nd DraigRygbi 388 490 10ms 19 Dec 2024 452nd argentite 388 490 10ms 11 Sep 2025 459th mikelane 387 491 10ms 29 Mar 2020 459th Jaydosu 387 491 10ms 22 Oct 2021 459th vishwathg 387 491 10ms 19 Aug 2022 459th grieve 387 491 9ms 9 Jun 2023 459th davidtiemstra 387 491 10ms 11 Jul 2023 459th Itnug 387 491 10ms 19 Jul 2023 459th Glinte 387 491 10ms 29 Dec 2023 459th cthierfelder 🇲🇨 387 491 10ms 5 Sep 2025 467th GreenyNeko 386 492 10ms 24 Jul 2020 467th ydevor 🇮🇱 386 492 10ms 20 Nov 2020 467th michael-alperovich 386 492 9ms 1 Feb 2021 467th richard-oelze 🇩🇪 386 492 10ms 28 Nov 2021 467th MichaelMBradley 🇨🇦 386 492 10ms 5 Apr 2022 467th DragonaireM 386 492 10ms 4 Feb 2023 473rd rothos 385 493 10ms 31 Dec 2024 473rd M4rc0g1 385 493 11ms 16 Nov 2025 475th specbug 385 494 10ms 30 Nov 2022 475th zsimo-lab49 385 494 10ms 15 May 2023 477th evanrittner 384 495 10ms 26 Feb 2021 477th kaptsanovb 384 495 10ms 4 Apr 2022 477th kenny14231 384 495 10ms 5 Aug 2022 477th OrangeBacon 384 495 10ms 31 Jul 2024 First Prev 401–480 of 1,170 Next Last
