The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 878th andyxukq 340 561 10ms 4 Feb 2025 882nd zgialor-lab 340 562 10ms 13 days ago 883rd fl3ur1nestimable 339 563 10ms 28 Mar 2022 884th NuqieNoila 339 564 9ms 1 Feb 2019 884th Saaxxx 339 564 10ms 22 Aug 2023 886th MiranDaniel 🇨🇿 338 565 17ms 30 Aug 2023 886th pquline 338 565 9ms 5 Mar 2025 888th artur-py 337 566 10ms 16 Dec 2022 888th skarabb 337 566 10ms 26 Mar 2024 890th CRHillman 336 568 10ms 14 Aug 2018 890th Greguhh 336 568 10ms 22 Oct 2024 892nd msrawson 336 569 9ms 13 Aug 2018 892nd TJK-S 336 569 10ms 25 Oct 2025 892nd mmarkakis 336 569 10ms 1 Dec 2025 892nd punoko 336 569 10ms 9 Dec 2025 896th ei14 335 570 10ms 18 Jun 2021 896th amollberg 🇸🇪 335 570 10ms 3 Jan 2022 896th Eulentier161 335 570 18ms 30 Aug 2023 899th te-chnical 335 571 10ms 23 Dec 2025 900th Watermelon876 334 572 10ms 27 Nov 2021 900th markbyrne 334 572 10ms 25 Aug 2022 900th joonaspu 334 572 10ms 3 Jun 2023 900th alfonsoalves 334 572 10ms 27 Feb 2024 904th BenAns 333 573 10ms 17 Nov 2018 904th KevinLaux 333 573 11ms 4 Dec 2022 906th Dejgz 332 575 10ms 11 Sep 2023 906th gigaprofisi 🇺🇸 332 575 11ms 2 Mar 2025 908th sayloren 332 576 10ms 30 Jul 2025 909th anananlyjlyj 331 577 10ms 2 Jul 2018 909th Sami-ul 331 577 11ms 12 Oct 2021 909th godCoderXYZ 331 577 10ms 5 Dec 2024 912th omgardner 330 578 10ms 1 Mar 2019 912th samual-hain 330 578 10ms 4 Apr 2024 912th JMMMMC 330 578 12ms 23 Oct 2024 915th bakaq 330 579 10ms 4 Jan 2020 915th danielweper 330 579 11ms 21 Oct 2021 917th NoneTheFewer 329 581 10ms 27 Dec 2025 918th Matistjati 328 582 10ms 17 Feb 2020 919th jpyCode 328 583 10ms 14 Jan 2019 920th osNiko 🇧🇷 326 585 11ms 25 Dec 2025 921st selketdaly 325 587 10ms 21 Feb 2021 921st DePopadopalis 325 587 10ms 6 Apr 2022 921st julienlamoureux78 325 587 11ms 17 Aug 2022 924th benanlam 325 588 10ms 20 Dec 2025 925th dlevear 324 589 10ms 20 May 2021 925th PrinceSalatyell 324 589 9ms 22 Jun 2022 927th maxliuql 324 590 9ms 11 Jul 2025 928th joel-e-m-mitchell 323 591 10ms 10 Jun 2018 928th Nektar24 323 591 10ms 2 Jun 2023 928th Nightmarius 323 591 17ms 22 Jan 2024 931st bnuh 323 592 10ms 3 Dec 2022 931st omero-san 323 592 10ms 15 Sep 2025 933rd plainoldcheese 🇦🇶 322 594 10ms 16 Apr 2020 934th lewisdean98 321 595 30ms 4 Dec 2022 934th atrus159 321 595 10ms 24 Oct 2023 936th ktnguyen2 320 597 10ms 4 Jan 2020 936th halp1 320 597 10ms 7 Apr 2022 938th jjbvtk 319 598 10ms 31 Aug 2021 938th lethan3 319 598 9ms 1 Dec 2022 940th Modeba 319 599 10ms 5 Nov 2025 941st clodalala 318 600 10ms 1 Nov 2019 942nd dylanjones92 315 606 10ms 19 Jan 2024 943rd zuparnowa 315 607 9ms 28 Jan 2019 943rd henrytranter 315 607 10ms 20 Sep 2019 945th Piccora 314 608 10ms 3 Oct 2022 945th Baxi-codes 314 608 10ms 4 Jan 2023 947th FJSFerreira 314 609 10ms 22 May 2021 948th besasam 313 610 9ms 31 Mar 2021 948th OddAlgorithm 313 610 10ms 4 Dec 2022 950th surbainczyk 313 611 10ms 22 Jul 2022 951st lakshmanaprasanth 311 615 10ms 10 Jun 2021 952nd mhenion8293 🇺🇸 310 616 10ms 11 Jan 2022 952nd kelseychristensen 310 616 11ms 3 Nov 2022 952nd jrappeneker 310 616 10ms 24 Apr 2025 955th warrinerbros 309 618 10ms 3 Dec 2021 956th valgardg 🇮🇸 308 620 16ms 17 Aug 2021 957th delphonso 308 621 10ms 17 Dec 2021 957th Knight333 308 621 9ms 26 Dec 2023 959th MadasMatt4 307 623 10ms 29 Jan 2020 959th anarcie 307 623 10ms 12 Dec 2023 First Prev 881–960 of 1,167 Next Last
