The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 36 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 393rd TiagoCosta04 🇵🇹 395 481 10ms 1 Jun 2025 393rd ASampsonMu31 395 481 10ms 19 days ago 403rd Froststorm 394 482 10ms 8 Oct 2020 403rd GWStuart 394 482 10ms 26 Nov 2021 403rd lostMia 394 482 10ms 11 Jun 2023 403rd raspofabs 394 482 10ms 8 Jul 2023 403rd Mathrew2012 394 482 10ms 16 Aug 2024 403rd RedzGoose 🇦🇺 394 482 10ms 13 Oct 2024 409th hymanimy 393 483 9ms 24 Aug 2021 409th jrm5399 🇰🇿 393 483 10ms 31 Jan 2022 409th S-Ruban 393 483 11ms 26 Feb 2023 409th leonw774 393 483 10ms 24 Oct 2023 409th thomas-saigre 393 483 9ms 24 Jan 2024 409th OCNeve 393 483 9ms 17 Jun 2024 409th madex 🇩🇪 393 483 10ms 19 Dec 2024 409th AidanWalter 393 483 10ms 31 Dec 2024 409th jamiloBBKing 393 483 10ms 14 Apr 2025 409th jumpingtj 393 483 10ms 6 days ago 419th GoodClover 🇬🇧 393 484 10ms 11 Nov 2020 419th PatrickStephansen 🇿🇦 393 484 10ms 10 Dec 2021 419th Fanrco 393 484 10ms 31 Aug 2023 419th inverseLorentz 🇦🇺 393 484 9ms 21 May 2024 419th matsagad 393 484 11ms 12 Dec 2024 419th syyynth 393 484 10ms 20 Oct 2025 425th bkshrader 392 485 9ms 11 Jan 2019 425th Andrey135296 392 485 9ms 2 Jan 2022 425th ballaire 392 485 9ms 21 Jan 2024 428th abailey2020 🇺🇸 391 486 10ms 26 Dec 2020 428th berkott 391 486 9ms 27 Dec 2022 428th en4rab 391 486 10ms 6 May 2023 428th markusgraube 391 486 10ms 8 Mar 2024 428th CodeByAidan 🇺🇸 391 486 10ms 19 Jun 2024 428th gthayden23 391 486 10ms 2 Oct 2024 428th jacekwladzinski 391 486 10ms 8 Oct 2025 428th deancureton 391 486 10ms 17 Dec 2025 436th 71c 390 487 10ms 8 Mar 2018 436th alangodfrey 390 487 10ms 6 Mar 2019 436th Wildst 390 487 9ms 14 Jun 2022 436th trist224 🇫🇷 390 487 10ms 5 Sep 2022 436th Ripick 390 487 10ms 30 Dec 2022 436th jmatko 390 487 10ms 17 Oct 2023 436th abcdhhhh 390 487 10ms 24 Aug 2024 436th morphthesworph 390 487 10ms 31 Dec 2025 444th timkaiser 389 488 10ms 18 Apr 2019 444th Nordle 389 488 9ms 28 Feb 2020 444th wrhm 389 488 9ms 12 Dec 2020 444th AkashTandon167 389 488 11ms 25 Jan 2021 444th Omega65536 🇩🇪 389 488 10ms 23 Jun 2021 444th Sturla22 389 488 11ms 4 Apr 2022 444th BrunoVisnadi 🇧🇷 389 488 10ms 3 Oct 2025 444th Code-Coder-coder 389 488 9ms 11 Oct 2025 452nd jgermain48 389 489 10ms 8 Dec 2019 453rd ly0va 388 490 9ms 7 Jan 2019 453rd chrismilson 388 490 10ms 18 May 2020 453rd hippopotam00sehead 🇨🇦 388 490 10ms 16 Sep 2024 453rd jbjd 388 490 10ms 17 Sep 2024 453rd lelbal 388 490 10ms 19 Sep 2024 453rd DraigRygbi 388 490 10ms 19 Dec 2024 453rd argentite 388 490 10ms 11 Sep 2025 460th mikelane 387 491 10ms 29 Mar 2020 460th Jaydosu 387 491 10ms 22 Oct 2021 460th vishwathg 387 491 10ms 19 Aug 2022 460th grieve 387 491 9ms 9 Jun 2023 460th davidtiemstra 387 491 10ms 11 Jul 2023 460th Itnug 387 491 10ms 19 Jul 2023 460th Glinte 387 491 10ms 29 Dec 2023 460th cthierfelder 🇲🇨 387 491 10ms 5 Sep 2025 468th GreenyNeko 386 492 10ms 24 Jul 2020 468th ydevor 🇮🇱 386 492 10ms 20 Nov 2020 468th michael-alperovich 386 492 9ms 1 Feb 2021 468th richard-oelze 🇩🇪 386 492 10ms 28 Nov 2021 468th MichaelMBradley 🇨🇦 386 492 10ms 5 Apr 2022 468th DragonaireM 386 492 10ms 4 Feb 2023 474th rothos 385 493 10ms 31 Dec 2024 474th M4rc0g1 385 493 11ms 16 Nov 2025 476th specbug 385 494 10ms 30 Nov 2022 476th zsimo-lab49 385 494 10ms 15 May 2023 478th evanrittner 384 495 10ms 26 Feb 2021 478th kaptsanovb 384 495 10ms 4 Apr 2022 478th kenny14231 384 495 10ms 5 Aug 2022 First Prev 401–480 of 1,171 Next Last
