The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Arabic to Roman 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 721st southpolenator 678 199 69ms 10 Jun 2023 722nd southpolenator 677 151 10ms 10 Jun 2023 723rd janbehrens 🇩🇪 677 176 470ms 17 Apr 2025 724th akshatj27 🇦🇶 676 121 125ms 11 Jan 2022 725th itsh01 675 136 15ms 9 Aug 2021 725th Sam-Vrgl 675 136 12ms 13 May 2025 727th Ripick 675 184 445ms 12 Jul 2025 728th lynn 675 204 1,404ms 24 Oct 2021 729th yzhs 🇩🇪 674 179 29ms 8 Feb 2020 729th urojony 🇵🇱 674 179 24ms 27 May 2021 729th raspofabs 674 179 24ms 8 Jul 2023 729th FranklinJiaChen 674 179 22ms 12 Jun 2024 729th kistlerf 🇨🇭 674 179 37ms 12 May 2025 729th LuisGoncalves05 🇵🇹 674 179 23ms 11 Jul 2025 729th jacekwladzinski 674 179 35ms 8 Oct 2025 736th janbehrens 🇩🇪 674 215 612ms 7 Jan 2022 737th MeWhenI 🇻🇦 673 141 10ms 11 Nov 2022 738th prestosilver 🇺🇸 672 185 413ms 30 Dec 2025 739th JDiLenarda 🇫🇷 672 205 1,328ms 22 Nov 2023 740th Indivicivet 671 180 20ms 11 Mar 2021 740th cesarm4 671 180 26ms 31 Aug 2021 740th idoweinstein 671 180 20ms 5 Aug 2022 740th ellis-rix 671 180 24ms 25 Aug 2022 740th StardustGogeta 671 180 24ms 18 Aug 2023 740th Andrey2001 671 180 27ms 23 Nov 2025 746th stefangimmillaro 670 137 15ms 12 Sep 2024 747th Yax42 🇫🇷 669 178 422ms 20 Jun 2025 748th targrik 669 233 332ms 3 Jul 2025 749th Alex-x90 🇺🇸 668 153 10ms 15 May 2023 750th kmathis22 668 217 633ms 19 Dec 2025 751st CaedenHarper 🇨🇦 667 156 495ms 29 Oct 2025 752nd Fishron 667 181 25ms 20 Nov 2022 752nd nstearns96 🇬🇧 667 181 28ms 29 Nov 2022 752nd pde-bakk 🇳🇱 667 181 26ms 23 Oct 2023 752nd elgan65536 🇺🇸 667 181 22ms 1 Apr 2024 752nd EnTerr 667 181 24ms 8 Sep 2024 752nd Josemnz 667 181 23ms 4 May 2025 758th stackotter 666 227 117ms 29 May 2023 759th Andriamanitra 🇫🇮 665 123 45ms 1 Sep 2022 760th KatieLG 🇬🇧 665 138 20ms 16 Nov 2023 761st Shanethegamer 🇺🇸 665 221 31ms 10 Feb 2026 762nd alemelis 664 136 814ms 19 Sep 2024 763rd Jonatan6 🇩🇰 664 203 68ms 3 Aug 2023 764th Alex-x90 🇺🇸 663 182 47ms 13 Feb 2023 764th cefqrn 663 182 29ms 20 May 2023 764th jeff-at-tamer-dot-codes 🇺🇸 663 182 20ms 8 Sep 2023 764th fgrosshans 🇫🇷 663 182 22ms 16 Jul 2024 768th SirBogman 🇺🇸 663 375 614ms 23 Nov 2022 769th MeWhenI 🇻🇦 661 249 175ms 13 Nov 2022 770th Frowny 660 67 9ms 10 Jan 2022 771st skps2010 660 183 21ms 31 Dec 2018 771st asheeri 660 183 22ms 14 Aug 2021 771st TaserTheFox 🇺🇸 660 183 24ms 8 May 2023 774th olleicua 🇺🇸 659 124 52ms 19 Jan 2024 775th darkoboshkovski 659 155 9ms 12 Jun 2023 776th Mabeloid 🇳🇴 658 158 631ms 17 Sep 2024 776th dokutan 658 158 522ms 1 Feb 2026 778th p-vf 🇨🇭 658 181 406ms 21 Nov 2021 778th Shanethegamer 🇺🇸 658 181 470ms 4 Apr 2023 780th dokutan 658 205 3,028ms 2 Feb 2026 781st MichalMarsalek 🇨🇿 657 189 463ms 22 Jan 2023 781st Shanethegamer 🇺🇸 657 189 660ms 21 Mar 2023 781st DestyNova 🇮🇪 657 189 456ms 15 Apr 2025 784th Shanethegamer 🇺🇸 657 218 115ms 11 Sep 2022 785th annaproxy 657 222 339ms 1 Aug 2022 786th Shanethegamer 🇺🇸 657 237 373ms 4 Apr 2023 787th adoxography 656 184 21ms 10 Oct 2019 787th mokymok 🇺🇸 656 184 29ms 8 Dec 2021 787th jakobkordez 🇸🇮 656 184 19ms 17 Oct 2022 787th yishayv 656 184 21ms 23 Jan 2023 787th Bmrl7 656 184 27ms 17 Feb 2024 787th jatloe 656 184 20ms 5 Oct 2024 793rd jared-hughes 655 97 40ms 16 Apr 2022 794th emgordon154 655 140 19ms 2 Dec 2021 794th Lv0Sys 🇵🇱 655 140 13ms 27 Nov 2025 796th prestosilver 🇺🇸 655 156 11ms 21 Nov 2025 797th stefangimmillaro 655 182 452ms 17 Sep 2024 798th Shanethegamer 🇺🇸 653 163 175ms 24 May 2025 799th nsprd 652 185 25ms 19 Jan 2024 799th DxSper 652 185 34ms 16 Feb 2024 First Prev 721–800 of 1,909 Next Last