The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Catalan Numbers 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 319th kellantech 603 73 18ms 4 Aug 2023 319th FortuiteMan 🇫🇷 603 73 19ms 20 Oct 2024 323rd DrPiranoid 595 74 10ms 26 Sep 2022 323rd JudeTyrrell 595 74 10ms 5 Oct 2024 325th adoxography 587 75 10ms 19 Feb 2022 325th Bonjour27891 🇻🇳 587 75 16ms 19 Feb 2022 325th jhpaques 🇫🇷 587 75 11ms 29 Sep 2022 325th Troon 587 75 11ms 4 Nov 2022 325th olivermrose 🇺🇸 587 75 18ms 16 Jan 2023 325th jhu04 587 75 10ms 23 Jun 2023 325th dahappy1989 587 75 9ms 5 Nov 2023 332nd jacklynnepenick 579 76 10ms 15 Feb 2022 332nd hiichbindermax 579 76 14ms 25 Feb 2022 332nd Andrey135296 579 76 11ms 4 Apr 2022 332nd myleopard 579 76 10ms 20 Jul 2022 332nd julian-hoelz 579 76 11ms 23 Sep 2024 332nd tomh1012 579 76 9ms 18 Feb 2026 338th dzshn 571 77 10ms 15 Aug 2022 338th S-Ruban 571 77 10ms 25 Feb 2023 338th NickTheEASDude 🇺🇸 571 77 10ms 1 May 2024 338th jamesthekee 571 77 11ms 16 Apr 2025 338th 40fied4t 571 77 10ms 17 May 2025 343rd amollberg 🇸🇪 564 78 11ms 29 Jan 2022 343rd ArmaanAS 564 78 18ms 22 Feb 2022 343rd lukemalek 564 78 10ms 10 Oct 2022 343rd Bodo171 564 78 11ms 7 Dec 2022 343rd bobbysq 564 78 10ms 20 Dec 2022 343rd marcin7Cd 564 78 10ms 24 Mar 2023 343rd TheZwierzLF 🇵🇱 564 78 12ms 17 May 2025 350th trist224 🇫🇷 557 79 12ms 26 Aug 2022 350th CatsAreFluffy 557 79 10ms 2 Sep 2023 350th yuchuehw 557 79 18ms 6 Feb 2024 353rd pyrolitic 🇮🇪 550 80 10ms 6 Apr 2022 353rd andre-lameirinhas 🇵🇹 550 80 10ms 13 Aug 2022 353rd grhkm21 550 80 11ms 19 Dec 2022 353rd Florian-Mt 550 80 10ms 26 Sep 2023 353rd NoneTheFewer 550 80 10ms 27 Dec 2025 358th abba23 543 81 11ms 1 Jun 2022 358th tpremoli 543 81 18ms 8 Mar 2023 358th ridingqwerty 🇺🇸 543 81 10ms 7 Feb 2024 358th willschremmer 543 81 11ms 28 Apr 2024 358th PyryL 🇫🇮 543 81 12ms 23 Aug 2024 363rd twocatsinatrenchcoat 537 82 11ms 3 Feb 2022 363rd hjcafaroUC 537 82 10ms 15 Aug 2022 363rd AodhanDalton 537 82 11ms 2 Sep 2022 363rd loganmacdougall 🇨🇦 537 82 11ms 16 Nov 2022 363rd goGuru 537 82 11ms 2 Jan 2023 363rd latvianfarmer17 🇱🇻 537 82 9ms 20 Jul 2023 369th felixcroc 524 84 10ms 28 Mar 2023 369th Mr-McChicken 524 84 10ms 15 Oct 2023 371st ehulinsky 🇺🇸 518 85 18ms 8 May 2023 371st RaBa21 🇭🇺 518 85 24ms 19 Jul 2025 373rd brimstonetrader 512 86 10ms 10 Jan 2024 373rd Andrey2001 512 86 10ms 27 Nov 2025 375th za3k 506 87 10ms 11 Oct 2022 375th ComputerKWasTaken 🇺🇸 506 87 11ms 24 Sep 2024 377th shibacho 🇯🇵 500 88 10ms 24 Mar 2022 377th Wildst 500 88 9ms 23 Sep 2022 377th jaxmattfair 🇺🇸 500 88 16ms 22 May 2024 377th rsujeevan 500 88 10ms 5 May 2025 377th JOrE-Softwares 500 88 10ms 23 May 2025 377th Aquateraneal 🇺🇸 500 88 10ms 4 Nov 2025 383rd MassimoParisi 494 89 18ms 25 Sep 2024 384th ItsEthanDev 484 91 11ms 14 Mar 2024 384th elana-teal 484 91 10ms 2 Jul 2025 386th FoxInTheClouds 478 92 17ms 18 Jan 2026 387th Trunksistor 🇫🇷 468 94 11ms 25 May 2022 387th hymanimy 468 94 10ms 24 Nov 2022 389th 1231234md5 🇨🇳 440 100 11ms 11 Dec 2023 389th roguh 🇬🇹 440 100 10ms 9 Jun 2024 391st Ugoran 436 101 11ms 19 Nov 2022 392nd Andre3582 431 102 10ms 13 Mar 2022 392nd griffinschreiber 431 102 10ms 25 Jun 2023 394th XenThe 🇬🇧 423 104 9ms 6 Nov 2025 395th galloj 🇨🇿 419 105 10ms 16 Aug 2022 395th BabySharkHi 419 105 10ms 22 Apr 2025 397th ImpressedByRocks 407 108 13ms 24 Jun 2022 397th Jacob385 407 108 10ms 15 Mar 2024 399th TJK-S 404 109 10ms 16 Oct 2025 400th feherd 386 114 10ms 20 May 2022 First Prev 321–400 of 430 Next Last