The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 42 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 879th iilegacyyii 339 560 17ms 30 Dec 2025 882nd kalpanasuresh 339 561 10ms 26 Mar 2021 882nd luxdragon 339 561 10ms 11 Oct 2022 882nd falinos 339 561 10ms 1 Jan 2023 882nd andyxukq 339 561 10ms 4 Feb 2025 886th zgialor-lab 338 562 10ms 19 days ago 887th fl3ur1nestimable 337 563 10ms 28 Mar 2022 888th NuqieNoila 337 564 9ms 1 Feb 2019 888th Saaxxx 337 564 10ms 22 Aug 2023 890th MiranDaniel 🇨🇿 336 565 17ms 30 Aug 2023 890th pquline 336 565 9ms 5 Mar 2025 892nd artur-py 336 566 10ms 16 Dec 2022 892nd skarabb 336 566 10ms 26 Mar 2024 894th CRHillman 335 568 10ms 14 Aug 2018 894th Greguhh 335 568 10ms 22 Oct 2024 896th msrawson 334 569 9ms 13 Aug 2018 896th TJK-S 334 569 10ms 25 Oct 2025 896th mmarkakis 334 569 10ms 1 Dec 2025 896th punoko 334 569 10ms 9 Dec 2025 900th ei14 333 570 10ms 18 Jun 2021 900th amollberg 🇸🇪 333 570 10ms 3 Jan 2022 900th Eulentier161 333 570 18ms 30 Aug 2023 903rd te-chnical 333 571 10ms 23 Dec 2025 904th Watermelon876 332 572 10ms 27 Nov 2021 904th markbyrne 332 572 10ms 25 Aug 2022 904th joonaspu 332 572 10ms 3 Jun 2023 904th alfonsoalves 332 572 10ms 27 Feb 2024 908th BenAns 332 573 10ms 17 Nov 2018 908th KevinLaux 332 573 11ms 4 Dec 2022 910th Dejgz 330 575 10ms 11 Sep 2023 910th gigaprofisi 🇺🇸 330 575 11ms 2 Mar 2025 912th sayloren 330 576 10ms 30 Jul 2025 913th anananlyjlyj 329 577 10ms 2 Jul 2018 913th Sami-ul 329 577 11ms 12 Oct 2021 913th godCoderXYZ 329 577 10ms 5 Dec 2024 916th omgardner 329 578 10ms 1 Mar 2019 916th samual-hain 329 578 10ms 4 Apr 2024 916th JMMMMC 329 578 12ms 23 Oct 2024 919th bakaq 328 579 10ms 4 Jan 2020 919th danielweper 328 579 11ms 21 Oct 2021 921st NoneTheFewer 327 581 10ms 27 Dec 2025 922nd Matistjati 326 582 10ms 17 Feb 2020 923rd jpyCode 326 583 10ms 14 Jan 2019 924th osNiko 🇧🇷 325 585 11ms 25 Dec 2025 925th selketdaly 324 587 10ms 21 Feb 2021 925th DePopadopalis 324 587 10ms 6 Apr 2022 925th julienlamoureux78 324 587 11ms 17 Aug 2022 928th benanlam 323 588 10ms 20 Dec 2025 929th dlevear 323 589 10ms 20 May 2021 929th PrinceSalatyell 323 589 9ms 22 Jun 2022 931st maxliuql 322 590 9ms 11 Jul 2025 932nd joel-e-m-mitchell 321 591 10ms 10 Jun 2018 932nd Nektar24 321 591 10ms 2 Jun 2023 932nd Nightmarius 321 591 17ms 22 Jan 2024 935th bnuh 321 592 10ms 3 Dec 2022 935th omero-san 321 592 10ms 15 Sep 2025 937th plainoldcheese 🇦🇶 320 594 10ms 16 Apr 2020 938th lewisdean98 319 595 30ms 4 Dec 2022 938th atrus159 319 595 10ms 24 Oct 2023 940th ktnguyen2 318 597 10ms 4 Jan 2020 940th halp1 318 597 10ms 7 Apr 2022 942nd jjbvtk 318 598 10ms 31 Aug 2021 942nd lethan3 318 598 9ms 1 Dec 2022 944th Modeba 317 599 10ms 5 Nov 2025 945th clodalala 317 600 10ms 1 Nov 2019 946th dylanjones92 314 606 10ms 19 Jan 2024 947th zuparnowa 313 607 9ms 28 Jan 2019 947th henrytranter 313 607 10ms 20 Sep 2019 949th Piccora 313 608 10ms 3 Oct 2022 949th Baxi-codes 313 608 10ms 4 Jan 2023 951st FJSFerreira 312 609 10ms 22 May 2021 952nd besasam 311 610 9ms 31 Mar 2021 952nd OddAlgorithm 311 610 10ms 4 Dec 2022 954th surbainczyk 311 611 10ms 22 Jul 2022 955th lakshmanaprasanth 309 615 10ms 10 Jun 2021 956th mhenion8293 🇺🇸 308 616 10ms 11 Jan 2022 956th kelseychristensen 308 616 11ms 3 Nov 2022 956th jrappeneker 308 616 10ms 24 Apr 2025 959th warrinerbros 307 618 10ms 3 Dec 2021 960th valgardg 🇮🇸 306 620 16ms 17 Aug 2021 First Prev 881–960 of 1,171 Next Last
