The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
π 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 mathisfun271 817 71 13ms 15 Feb 2024 82nd Natanaelel 🇸🇪 806 72 11ms 9 Feb 2026 83rd argusdusty 🇺🇸 795 73 12ms 31 Dec 2020 83rd btjones0 795 73 19ms 15 Jul 2022 83rd b10011 🇫🇮 795 73 10ms 11 Jan 2023 83rd Alex-x90 🇺🇸 795 73 27ms 17 Feb 2023 83rd andrewjc2000 795 73 12ms 21 Mar 2025 83rd wuduculfre 795 73 12ms 22 Jul 2025 83rd Just4FunCoder 795 73 13ms 24 Sep 2025 83rd CommandLeo 🇮🇹 795 73 12ms 24 Nov 2025 91st marcin7Cd 784 74 17ms 4 Feb 2021 91st jacklynnepenick 784 74 20ms 18 Aug 2021 91st redweasel 784 74 11ms 14 Jul 2025 91st YAJUE114514 784 74 12ms 11 Dec 2025 95th moustave 773 75 11ms 14 Mar 2025 96th NewDefectus 🇮🇱 763 76 31ms 10 Feb 2021 96th FortuiteMan 🇫🇷 763 76 11ms 1 Sep 2025 96th solisolu 763 76 19ms 16 Nov 2025 99th LogicalJoe 753 77 19ms 10 Nov 2022 99th stefangimmillaro 753 77 11ms 19 Dec 2022 99th roupiq 🇵🇱 753 77 15ms 11 days ago 102nd davecame 744 78 11ms 10 Oct 2023 102nd Lv0Sys 🇵🇱 744 78 11ms 19 Feb 2026 104th nstearns96 🇬🇧 734 79 48ms 23 Oct 2024 105th geofft 725 80 11ms 13 Dec 2020 105th betaveros 725 80 11ms 1 Jan 2023 105th commandz0 🇺🇸 725 80 33ms 22 Aug 2023 105th Command-Master 725 80 11ms 24 Sep 2023 105th elgan65536 🇺🇸 725 80 2,152ms 8 Apr 2024 110th xAlien95 716 81 10ms 30 Jan 2020 110th janbehrens 🇩🇪 716 81 11ms 17 Jun 2023 112th wen1now 707 82 11ms 7 Nov 2023 112th ei14 707 82 31ms 23 May 2024 112th Matter1024 🇮🇳 707 82 11ms 5 days ago 115th HETHAT 🇩🇿 699 83 19ms 30 Jul 2025 115th tomh1012 699 83 10ms 20 days ago 117th yokasuretsu 690 84 12ms 14 Apr 2018 118th Bulmenisaurus 682 85 1,917ms 19 Mar 2025 119th yzhs 🇩🇪 674 86 28ms 25 Oct 2020 119th FCORMERAIS 674 86 11ms 5 Mar 2024 121st JOrE20 667 87 26ms 30 Dec 2025 122nd knutae 🇳🇴 659 88 14ms 10 Apr 2018 122nd daedals 659 88 15ms 6 Jun 2019 122nd urojony 🇵🇱 659 88 14ms 3 Jan 2021 122nd elmoiv 🇪🇬 659 88 15ms 23 Jun 2021 122nd RYNO8 659 88 2,427ms 27 Aug 2021 122nd LouisRustenholz 659 88 26ms 23 Dec 2021 122nd Bonjour27891 🇻🇳 659 88 24ms 11 Mar 2022 122nd scpchicken 🇵🇼 659 88 25ms 19 Mar 2022 122nd fourth-bit 659 88 16ms 9 Dec 2022 122nd DrPiranoid 659 88 15ms 26 Mar 2023 122nd BREMAUCY 🇫🇷 659 88 15ms 29 Apr 2024 122nd qpwoeirut 659 88 26ms 2 Oct 2025 134th glesnick 652 89 33ms 18 Aug 2022 135th programjames 644 90 1,327ms 24 Dec 2023 135th christensendaniel 644 90 18ms 2 Dec 2025 135th FEZfan 🇦🇺 644 90 254ms 9 Feb 2026 138th hellwue 637 91 24ms 25 Feb 2022 138th HumanoidCPU 637 91 20ms 2 Jul 2024 138th hiichbindermax 637 91 16ms 14 Feb 2025 141st Nietchev 630 92 142ms 5 Dec 2021 141st ImpressedByRocks 630 92 896ms 22 May 2025 143rd KatieLG 🇬🇧 624 93 146ms 1 Nov 2020 143rd CarsonChr 🇺🇸 624 93 11ms 21 Sep 2022 143rd Yewzir 🇧🇪 624 93 15ms 27 May 2023 146th quimey 611 95 81ms 16 Mar 2023 147th cingulataluke 598 97 16ms 26 Aug 2023 148th bac0id 586 99 16ms 26 Sep 2023 149th leon-w 580 100 57ms 4 Jan 2019 149th LlamaLad7 🇬🇧 580 100 21ms 17 Jan 2021 151st potato-jackson 569 102 10ms 6 Sep 2021 151st wh3n3v3r 🇨🇿 569 102 21ms 20 Nov 2024 151st piano-miles 569 102 211ms 3 Aug 2025 154th matsagad 558 104 252ms 12 Dec 2024 155th cros107 🇦🇺 552 105 61ms 11 Aug 2023 156th tri1212 🇻🇳 547 106 37ms 8 May 2023 157th jtaxen 542 107 14ms 31 Mar 2024 158th jiaminglimjm 🇲🇾 537 108 13ms 27 Nov 2019 159th neihousaigaai 532 109 2,647ms 7 May 2021 159th NDR0216 🇹🇼 532 109 398ms 13 Feb 2023 First Prev 81–160 of 658 Next Last