The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Vampire 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 80th loganmacdougall 🇨🇦 634 123 325ms 1 Nov 2022 82nd 77Tigers 629 124 904ms 28 Feb 2021 82nd fourth-bit 629 124 381ms 2 Dec 2022 82nd bzijlema 🇳🇱 629 124 240ms 7 Aug 2024 82nd blaztoma 🇱🇹 629 124 253ms 31 Oct 2025 86th zhaohm14 624 125 654ms 9 Jan 2026 86th FortuiteMan 🇫🇷 624 125 218ms 22 days ago 86th aksyristos 624 125 606ms 112 mins ago 89th abailey2020 🇺🇸 614 127 260ms 28 Dec 2020 89th Frowny 614 127 472ms 14 Jul 2021 89th bricknellj 614 127 638ms 22 Jul 2022 89th Fracture17 614 127 752ms 11 Apr 2023 89th CaedenHarper 🇨🇦 614 127 588ms 12 Dec 2025 94th ahmetdemirag 🇨🇾 609 128 407ms 14 Feb 2025 95th AlephSquirrel 605 129 512ms 17 Jan 2023 95th minhtrancccp 605 129 338ms 1 Nov 2023 95th boboquack 605 129 767ms 13 Nov 2023 98th andre-lameirinhas 🇵🇹 600 130 557ms 14 Apr 2023 98th quimey 600 130 531ms 22 Jun 2023 98th msbranicky 600 130 517ms 23 Jul 2023 98th zacjl 600 130 261ms 22 Sep 2023 98th inventshah 600 130 826ms 27 Nov 2023 98th BREMAUCY 🇫🇷 600 130 554ms 14 May 2024 104th TobyBoyne 🇬🇧 591 132 252ms 15 Apr 2022 104th fuzzylojik-golf 🇺🇸 591 132 680ms 4 Jan 2026 106th Deedogg 586 133 498ms 30 Oct 2025 106th Lv0Sys 🇵🇱 586 133 648ms 4 Dec 2025 108th neihousaigaai 582 134 276ms 31 Oct 2021 108th davecame 582 134 797ms 24 Oct 2025 110th Indivicivet 578 135 403ms 26 Oct 2021 111th CedricGebistorf 574 136 293ms 6 Mar 2022 111th croc54 574 136 682ms 18 Jan 2025 111th InigoK 🇺🇸 574 136 722ms 29 Aug 2025 111th cefqrn 574 136 302ms 31 Oct 2025 115th suwat513 569 137 558ms 6 Dec 2022 115th andrewjc2000 569 137 777ms 18 Jul 2025 117th EnTerr 565 138 568ms 15 Sep 2024 118th jiaminglimjm 🇲🇾 561 139 378ms 9 Jan 2021 118th jacklynnepenick 561 139 634ms 26 Aug 2021 118th zbreit 🇺🇸 561 139 280ms 15 Nov 2025 121st badboj40 557 140 522ms 18 Jan 2023 122nd AkashTandon167 553 141 297ms 29 Oct 2021 122nd Troon 553 141 587ms 28 Feb 2025 124th betaveros 549 142 637ms 1 Jan 2023 124th Mikey-Beep 🇬🇧 549 142 625ms 27 Jul 2025 126th Dazza314 🇬🇧 545 143 821ms 5 Nov 2020 126th OllieBoyne 🇬🇧 545 143 417ms 16 Jan 2021 126th TaserTheFox 🇺🇸 545 143 564ms 9 May 2023 126th pde-bakk 🇳🇱 545 143 598ms 25 Oct 2023 126th StardustGogeta 545 143 294ms 31 Oct 2025 131st SupImDos 542 144 669ms 5 Nov 2020 132nd RDShah 538 145 628ms 15 Apr 2021 132nd ehulinsky 🇺🇸 538 145 524ms 28 Sep 2021 132nd mathisfun271 538 145 659ms 20 Nov 2023 135th Pena86 534 146 430ms 27 Feb 2021 135th fredrik-bakke 🇳🇴 534 146 477ms 2 Nov 2022 137th HumanEquivalentUnit 527 148 488ms 26 Nov 2023 137th Freddiechang 527 148 647ms 14 Mar 2024 139th jbjd 523 149 336ms 27 Feb 2024 139th rschwa6308 🇺🇸 523 149 308ms 30 Oct 2025 139th Languag3 523 149 265ms 31 Oct 2025 142nd firegene 🇮🇪 520 150 238ms 3 Dec 2023 142nd jacekwladzinski 520 150 275ms 3 Oct 2025 144th marcin7Cd 513 152 592ms 21 Dec 2020 144th amollberg 🇸🇪 513 152 412ms 21 Jan 2022 144th petroselo 513 152 677ms 12 Apr 2022 144th galloj 🇨🇿 513 152 746ms 6 Nov 2022 144th zwxzwxzwx21 513 152 462ms 7 Feb 2024 149th za3k 510 153 498ms 15 Oct 2022 150th hellwue 506 154 268ms 17 Feb 2023 150th hiichbindermax 506 154 266ms 17 Feb 2023 152nd MichalMarsalek 🇨🇿 497 157 981ms 28 Jun 2022 152nd janbehrens 🇩🇪 497 157 390ms 17 Jun 2023 152nd yuchuehw 497 157 742ms 19 Jan 2024 152nd xyangst 497 157 764ms 15 Oct 2024 156th ArmaanAS 494 158 514ms 3 Apr 2021 156th PyryL 🇫🇮 494 158 948ms 23 Aug 2024 158th ludwig-n 491 159 354ms 7 Apr 2021 159th itiievskyi 🇺🇦 488 160 484ms 6 Jan 2021 160th cros107 🇦🇺 484 161 481ms 17 Oct 2023 First Prev 81–160 of 266 Next Last