The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Roman to Arabic in all languages 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 641st joll05 🇸🇪 720 132 22ms 20 Aug 2020 641st albanian-laundromat 720 132 21ms 16 Sep 2025 643rd lynn 717 62 42ms 24 Oct 2021 644th antimon2 🇯🇵 717 86 1,044ms 18 Aug 2025 645th Attero 🇸🇪 717 106 14ms 28 Oct 2020 645th jared-hughes 717 106 16ms 3 Aug 2022 645th coreynash 717 106 18ms 16 Feb 2024 648th tkwa 715 133 21ms 4 Dec 2018 648th fourth-bit 715 133 42ms 13 Jul 2023 650th Alessandro-Balconi 🇮🇹 714 49 92ms 14 Jul 2023 650th Shanethegamer 🇺🇸 714 49 85ms 7 Dec 2024 652nd raphaelimahorn 711 107 19ms 17 Aug 2021 652nd scpchicken 🇵🇼 711 107 14ms 26 Jan 2022 652nd itsh01 711 107 14ms 3 Apr 2022 652nd solmyr2000 711 107 14ms 11 Jun 2022 652nd rifatx 711 107 16ms 17 Mar 2023 652nd acollett89 711 107 13ms 4 Aug 2025 658th relet 709 134 21ms 8 Aug 2018 658th melven 709 134 23ms 16 Oct 2025 660th user189032 708 158 296ms 30 May 2019 661st ovs-code 🇩🇪 707 86 20ms 4 Oct 2024 662nd lynn 707 117 1,077ms 30 Nov 2021 663rd Yewzir 🇧🇪 707 172 44ms 9 Jun 2024 664th SirBogman 🇺🇸 706 86 3,594ms 11 Apr 2024 665th Shanethegamer 🇺🇸 706 114 390ms 31 Oct 2023 666th Shanethegamer 🇺🇸 705 146 2,945ms 9 Jan 2022 666th Yewzir 🇧🇪 705 146 60ms 10 Jun 2024 668th HETHAT 🇩🇿 704 135 21ms 22 Mar 2021 669th andersk 🇺🇸 704 162 155ms 18 Mar 2020 670th strout 703 159 331ms 14 Dec 2023 671st Waffle3z 699 129 16ms 17 Apr 2022 671st CaedenHarper 🇨🇦 699 129 6ms 22 Aug 2025 673rd jarekwg 699 136 19ms 2 Oct 2020 673rd OCNeve 699 136 20ms 18 Jun 2024 673rd minhtrancccp 699 136 21ms 25 Nov 2024 673rd luuumine 🇫🇷 699 136 22ms 17 Oct 2025 677th CaedenHarper 🇨🇦 699 160 255ms 22 Aug 2025 678th jake-freeman 698 109 15ms 13 May 2020 678th ArmaanAS 698 109 18ms 7 Mar 2021 678th voytxt 🇨🇿 698 109 19ms 12 Jul 2024 678th Lv0Sys 🇵🇱 698 109 15ms 20 Feb 2026 682nd stefangimmillaro 698 113 8ms 7 Nov 2023 683rd primo-ppcg 🇹🇭 698 147 485ms 1 Jun 2020 684th Yewzir 🇧🇪 697 134 472ms 15 Nov 2025 685th sean-niemann 🇺🇸 696 122 3ms 31 Oct 2023 686th jared-hughes 694 64 43ms 17 Apr 2022 687th yzhs 🇩🇪 694 137 22ms 15 Mar 2020 687th suwat513 694 137 43ms 15 Sep 2022 687th neihousaigaai 694 137 21ms 6 Oct 2024 690th Yewzir 🇧🇪 693 135 11ms 9 Jun 2024 691st Yewzir 🇧🇪 693 186 94ms 5 days ago 692nd helbling 🇨🇭 691 110 19ms 3 Sep 2025 693rd yzhs 🇩🇪 690 162 298ms 25 Jul 2021 694th SnowballSH 689 138 28ms 3 Feb 2021 695th annaproxy 689 159 32ms 11 May 2023 696th CaedenHarper 🇨🇦 688 117 164ms 17 Aug 2025 697th CaedenHarper 🇨🇦 688 136 11ms 22 Aug 2025 698th saito-ta 🇯🇵 687 87 537ms 23 Oct 2023 699th JOrE20 685 111 13ms 7 Feb 2026 700th Stockoh 🇫🇷 684 139 36ms 27 Feb 2024 700th te-chnical 684 139 26ms 8 Jan 2026 702nd AlephSquirrel 683 55 4ms 8 Nov 2025 703rd MeWhenI 🇻🇦 683 147 45ms 17 Feb 2023 704th KasperKivimaeki 🇫🇮 682 137 492ms 7 Nov 2025 705th MahlerFive 🇨🇦 680 186 375ms 24 Apr 2020 706th DialFrost 🇸🇬 679 88 3,026ms 7 Oct 2024 707th mintypython 679 112 13ms 16 Oct 2018 707th saramaebee 679 112 15ms 18 Oct 2018 707th igmcdowell 679 112 13ms 4 Jan 2022 710th kevinmchung 679 140 28ms 3 Apr 2018 711th commandz0 🇺🇸 678 116 537ms 1 Sep 2025 712th Jiramide 678 133 13ms 7 Feb 2021 713th ReidZ3 🇺🇸 678 165 319ms 13 Dec 2020 714th dokutan 674 138 250ms 13 Nov 2025 715th rifatx 674 141 28ms 16 Mar 2023 715th quimey 674 141 22ms 20 Jul 2023 717th KatieLG 🇬🇧 673 71 48ms 27 Nov 2023 718th vmcnabb 🇳🇿 673 113 14ms 6 May 2021 718th targrik 673 113 14ms 24 Feb 2025 720th MichalMarsalek 🇨🇿 673 135 379ms 30 Aug 2022 First Prev 641–720 of 1,514 Next Last
