The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 800th smothest 352 542 10ms 29 Dec 2023 800th ComputerKWasTaken 🇺🇸 352 542 10ms 31 May 2024 800th MiLk 352 542 13ms 19 Feb 2025 804th derekthatcher 352 543 10ms 24 Sep 2020 804th goolygong 352 543 10ms 20 Nov 2020 804th shinylego 352 543 11ms 19 Oct 2022 804th EthanGrant1 352 543 10ms 29 Dec 2022 804th tlucanti 🇷🇺 352 543 9ms 8 Jan 2024 804th jasonho2582001 352 543 10ms 28 Jun 2024 810th KiwiKoder0123 351 544 9ms 4 Jul 2019 810th Guptacos 351 544 10ms 2 Aug 2020 810th Pargolo 351 544 10ms 7 Oct 2021 810th humz2k 351 544 10ms 5 Jul 2022 810th AharonSambol 351 544 16ms 18 Aug 2023 810th AthiraPillai123 351 544 9ms 4 Jan 2024 810th multikatt 351 544 9ms 13 Jan 2026 810th davidludwik2370 351 544 10ms 20 days ago 818th dzshn 350 545 10ms 25 Nov 2020 818th jellybro99 350 545 9ms 15 Oct 2021 818th StoverGitHub 350 545 11ms 16 Jun 2022 818th Bananapants22 350 545 9ms 15 Aug 2022 818th bedwards 350 545 10ms 13 Jan 2025 823rd llysnafedd 350 546 10ms 28 Aug 2020 823rd alexstarosta 350 546 10ms 27 Jun 2024 823rd kyleyarwood 350 546 9ms 4 Oct 2024 823rd jwfiredragon 350 546 11ms 15 May 2025 827th smf0x10 349 547 10ms 3 Oct 2021 827th Eilonlif 🇮🇱 349 547 10ms 25 Dec 2022 827th b20fuji 349 547 10ms 18 Oct 2023 827th Amy-Checcllo 349 547 9ms 22 Sep 2024 827th GeorgeStatho 349 547 11ms 5 Aug 2025 832nd DylanScottCarroll 349 548 10ms 8 Nov 2021 832nd RubiksImplosion 349 548 10ms 4 Dec 2022 832nd felixcroc 349 548 11ms 1 Apr 2023 832nd epic-programmer-guy 349 548 10ms 29 Dec 2023 832nd MassimoParisi 349 548 16ms 24 Sep 2024 832nd Shotokhan 349 548 10ms 15 Sep 2025 832nd Evytag 🇫🇷 349 548 10ms 9 Oct 2025 839th afyber 348 549 9ms 26 Jun 2019 839th my1e5 348 549 9ms 29 Nov 2021 839th oakesy 348 549 10ms 19 May 2024 839th CyberTapir 348 549 10ms 30 Aug 2024 839th martindotexe 🇳🇴 348 549 17ms 15 Feb 2025 839th shawncrabtree 348 549 10ms 21 Jun 2025 839th Sharrrkkk 348 549 10ms 21 Jul 2025 846th Esterfox610 347 550 10ms 17 Aug 2022 846th llama1024 347 550 10ms 5 Dec 2022 846th lorienaquarius 347 550 10ms 31 Dec 2023 849th eoinfennessy 347 551 10ms 21 Jul 2021 849th micah-weitzman 347 551 10ms 27 Jul 2021 849th mehekj 347 551 10ms 29 Jul 2021 849th No-Jons 347 551 9ms 23 May 2022 853rd Parapet128 346 552 9ms 17 Jan 2019 853rd dillon-duncando 346 552 10ms 19 Dec 2021 853rd nmougino 🇫🇷 346 552 17ms 31 May 2022 853rd Vaibhav0460 346 552 10ms 16 Feb 2024 853rd navier-1 346 552 10ms 15 Sep 2025 853rd kasarino 346 552 10ms 30 Nov 2025 859th aazuspan 345 553 10ms 24 Nov 2021 859th leeyonjae 345 553 11ms 10 Dec 2023 859th jjkochan2 345 553 9ms 17 Jan 2025 862nd carsonsyberg 345 554 11ms 9 May 2022 863rd Alexander-Francis 344 555 10ms 10 Jul 2019 863rd itiievskyi 🇺🇦 344 555 10ms 10 Aug 2020 863rd KasperKivimaeki 🇫🇮 344 555 10ms 20 Nov 2025 863rd pingpwn 344 555 10ms 14 Feb 2026 867th dddthedark 344 556 10ms 21 Jun 2019 867th ejerrard 344 556 10ms 27 Aug 2020 867th robertovers 344 556 14ms 29 Sep 2023 867th imnotAlexKnight 344 556 10ms 10 Jul 2025 867th rahulbyte-js 344 556 10ms 25 Nov 2025 872nd amadeusdotpng 342 558 10ms 22 Apr 2023 872nd iliao2345 342 558 10ms 8 Jul 2025 874th lmolteno 342 559 10ms 3 Mar 2021 874th jmath3912 342 559 10ms 26 Apr 2024 876th estomagordo 🇳🇱 341 560 10ms 3 Aug 2019 876th gautambp 341 560 18ms 22 Jun 2025 876th iilegacyyii 341 560 17ms 30 Dec 2025 879th kalpanasuresh 340 561 10ms 26 Mar 2021 879th luxdragon 340 561 10ms 11 Oct 2022 First Prev 801–880 of 1,168 Next Last
