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 bytes. 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 Bytes Time Submitted 881st CRHillman 335 568 10ms 14 Aug 2018 881st CheeseCake628 🇳🇴 335 568 31ms 19 Mar 2023 881st Greguhh 335 568 10ms 22 Oct 2024 884th msrawson 334 569 9ms 13 Aug 2018 884th TJK-S 334 569 10ms 25 Oct 2025 884th mmarkakis 334 569 10ms 1 Dec 2025 884th punoko 334 569 10ms 9 Dec 2025 888th ei14 333 570 10ms 18 Jun 2021 888th amollberg 🇸🇪 333 570 10ms 3 Jan 2022 888th Eulentier161 333 570 18ms 30 Aug 2023 891st te-chnical 333 571 10ms 23 Dec 2025 892nd Watermelon876 332 572 10ms 27 Nov 2021 892nd markbyrne 332 572 10ms 25 Aug 2022 892nd joonaspu 332 572 10ms 3 Jun 2023 892nd alfonsoalves 332 572 10ms 27 Feb 2024 896th BenAns 332 573 10ms 17 Nov 2018 896th KevinLaux 332 573 11ms 4 Dec 2022 898th Dejgz 330 575 10ms 11 Sep 2023 898th gigaprofisi 🇺🇸 330 575 11ms 2 Mar 2025 900th sayloren 330 576 10ms 30 Jul 2025 901st anananlyjlyj 329 577 10ms 2 Jul 2018 901st Sami-ul 329 577 11ms 12 Oct 2021 901st godCoderXYZ 329 577 10ms 5 Dec 2024 904th omgardner 329 578 10ms 1 Mar 2019 904th samual-hain 329 578 10ms 4 Apr 2024 904th JMMMMC 329 578 12ms 23 Oct 2024 907th bakaq 328 579 10ms 4 Jan 2020 907th danielweper 328 579 11ms 21 Oct 2021 909th NoneTheFewer 327 581 10ms 27 Dec 2025 910th Matistjati 326 582 10ms 17 Feb 2020 911th jpyCode 326 583 10ms 14 Jan 2019 912th osNiko 🇧🇷 325 585 11ms 25 Dec 2025 913th selketdaly 324 587 10ms 21 Feb 2021 913th DePopadopalis 324 587 10ms 6 Apr 2022 913th julienlamoureux78 324 587 11ms 17 Aug 2022 916th benanlam 323 588 10ms 20 Dec 2025 917th dlevear 323 589 10ms 20 May 2021 917th PrinceSalatyell 323 589 9ms 22 Jun 2022 919th maxliuql 322 590 9ms 11 Jul 2025 920th joel-e-m-mitchell 321 591 10ms 10 Jun 2018 920th Nektar24 321 591 10ms 2 Jun 2023 920th Nightmarius 321 591 17ms 22 Jan 2024 923rd bnuh 321 592 10ms 3 Dec 2022 923rd omero-san 321 592 10ms 15 Sep 2025 925th plainoldcheese 🇦🇶 320 594 10ms 16 Apr 2020 926th lewisdean98 319 595 30ms 4 Dec 2022 926th atrus159 319 595 10ms 24 Oct 2023 928th ktnguyen2 318 597 10ms 4 Jan 2020 928th halp1 318 597 10ms 7 Apr 2022 930th jjbvtk 318 598 10ms 31 Aug 2021 930th lethan3 318 598 9ms 1 Dec 2022 932nd Modeba 317 599 10ms 5 Nov 2025 933rd clodalala 317 600 10ms 1 Nov 2019 934th dylanjones92 314 606 10ms 19 Jan 2024 935th zuparnowa 313 607 9ms 28 Jan 2019 935th henrytranter 313 607 10ms 20 Sep 2019 937th Piccora 313 608 10ms 3 Oct 2022 937th Baxi-codes 313 608 10ms 4 Jan 2023 939th FJSFerreira 312 609 10ms 22 May 2021 940th besasam 311 610 9ms 31 Mar 2021 940th OddAlgorithm 311 610 10ms 4 Dec 2022 942nd surbainczyk 311 611 10ms 22 Jul 2022 943rd lakshmanaprasanth 309 615 10ms 10 Jun 2021 944th mhenion8293 🇺🇸 308 616 10ms 11 Jan 2022 944th kelseychristensen 308 616 11ms 3 Nov 2022 944th jrappeneker 308 616 10ms 24 Apr 2025 947th warrinerbros 307 618 10ms 3 Dec 2021 948th valgardg 🇮🇸 306 620 16ms 17 Aug 2021 949th delphonso 306 621 10ms 17 Dec 2021 949th Knight333 306 621 9ms 26 Dec 2023 951st MadasMatt4 305 623 10ms 29 Jan 2020 951st anarcie 305 623 10ms 12 Dec 2023 953rd kbiggers 304 624 10ms 8 Dec 2020 954th etriddle88 302 629 10ms 7 Mar 2024 955th jackdonofrio 302 630 10ms 10 Apr 2020 956th foskaos 301 632 10ms 30 Oct 2023 956th Matthewhine8 301 632 10ms 25 Aug 2025 958th RobinStevenMartinez 300 633 10ms 8 Feb 2021 958th Rex-xeR 300 633 11ms 4 Jan 2025 960th Eugen-str 299 636 11ms 24 Oct 2023 First Prev 881–960 of 1,170 Next Last
