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 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 639th b10011 🇫🇮 368 517 16ms 26 Dec 2022 639th M450NCH00 368 517 9ms 4 Feb 2023 639th resoNathan 368 517 10ms 8 Jul 2024 639th IoLimmer 368 517 9ms 11 Jul 2024 639th Brokames 368 517 10ms 6 Jun 2025 646th Daniel-Martin576 367 518 10ms 1 Apr 2020 646th andrewgopher 367 518 9ms 28 Jul 2021 646th dlee888 367 518 10ms 17 Nov 2023 646th karadigm01 367 518 10ms 1 Mar 2026 650th GodEmperorCaterpie 366 519 10ms 5 Sep 2019 650th lemogne 366 519 10ms 9 Aug 2021 650th ToE42 366 519 11ms 7 Sep 2021 650th 104210 366 519 9ms 9 Nov 2022 650th tmanternach 366 519 10ms 23 Nov 2022 650th marcus-gomes-v 🇧🇷 366 519 11ms 23 Feb 2025 650th bradye31 366 519 10ms 20 Nov 2025 650th kayaulai 366 519 10ms 23 Nov 2025 658th Stockoh 🇫🇷 365 520 9ms 11 May 2021 658th Kasci 365 520 10ms 28 Dec 2021 658th azure-blondon 365 520 10ms 25 Dec 2023 658th joao-parreira 365 520 31ms 24 Apr 2024 658th kejcao 🇨🇦 365 520 16ms 10 May 2024 658th Florian-Mt 365 520 9ms 4 Dec 2025 664th mothcolada 🇺🇸 365 521 11ms 11 Mar 2021 664th nikhil9302 365 521 10ms 21 Nov 2021 664th LeeCamp 365 521 10ms 11 Dec 2021 664th jhpaques 🇫🇷 365 521 10ms 28 Dec 2022 664th WillConker 365 521 11ms 14 Jul 2023 664th 0xkarambit 365 521 10ms 24 Feb 2026 670th HemangRajvanshy 364 522 10ms 1 Apr 2020 670th nmgetahun 364 522 10ms 5 Dec 2022 670th pde-bakk 🇳🇱 364 522 10ms 21 Oct 2023 670th raflemakt 364 522 10ms 3 Jan 2024 670th codingisgreatbutiamnot 364 522 10ms 29 Jul 2024 670th Kowalskiexe 🇵🇱 364 522 10ms 19 Apr 2025 676th nickrodgers42 363 523 10ms 2 Oct 2020 676th piebot3000 363 523 10ms 13 Sep 2023 676th IdkWhatIsIdk 363 523 10ms 28 Oct 2024 676th OyuDays 363 523 10ms 17 Mar 2025 676th AdamMorris377 363 523 10ms 1 Jan 2026 676th jusaka 363 523 10ms 10 days ago 682nd gardarjuto 363 524 10ms 16 Nov 2020 682nd xy3 🇮🇪 363 524 10ms 4 Jan 2022 682nd xenufo 363 524 10ms 14 Jul 2022 682nd james-downey 363 524 10ms 14 Jul 2022 682nd Argon1999 363 524 10ms 21 Oct 2022 687th NicoAdams 362 525 10ms 21 Nov 2021 687th sleepyStick 362 525 11ms 5 Apr 2022 687th ce-warren 362 525 10ms 26 Aug 2023 687th qwjhvbxi 362 525 11ms 5 Feb 2024 687th TheAtrossian 362 525 10ms 5 Jan 2025 687th HagenFritz 362 525 10ms 19 Jun 2025 693rd babakoban 361 526 10ms 15 Aug 2019 693rd ashwinvis 361 526 9ms 17 Apr 2020 693rd hdformat 361 526 10ms 8 Jun 2020 693rd mathwiz42 361 526 10ms 17 Aug 2020 693rd confy 361 526 12ms 25 Oct 2020 693rd dgambit 361 526 10ms 2 Apr 2021 693rd goldstraw 361 526 10ms 30 Nov 2021 693rd JohannaWarnqvist 361 526 10ms 13 Feb 2022 693rd martinnorling 🇸🇪 361 526 10ms 28 Feb 2022 693rd ezhereshchin 361 526 11ms 1 May 2022 693rd fredoinsilico 361 526 9ms 7 Sep 2023 693rd aviyanp 361 526 10ms 13 Oct 2025 693rd ethanlchristensen 361 526 10ms 17 Oct 2025 693rd ElieDeBrauwer 361 526 10ms 25 Oct 2025 707th asadullayev 361 527 10ms 8 Jan 2021 707th PYRiTEmonark 361 527 10ms 11 Mar 2021 707th BackslashWelsh 361 527 9ms 23 Jul 2021 707th TyKeeling 361 527 9ms 22 Jun 2022 707th SomeSomeOne99 361 527 10ms 26 Mar 2025 707th asarvazyan 361 527 10ms 22 Oct 2025 713th willzywiec 360 528 31ms 8 Aug 2018 713th ionutm82 360 528 10ms 9 Nov 2018 713th jhunterkohler 360 528 10ms 20 May 2021 713th elephantpanda 360 528 10ms 14 Oct 2022 713th sandorstormen 360 528 10ms 11 Mar 2023 713th fbe 360 528 10ms 11 Sep 2024 713th MasterGodzilla 360 528 16ms 26 Jun 2025 713th themoonisacheese 360 528 9ms 29 Dec 2025 First Prev 641–720 of 1,169 Next Last
