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?
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 719th InigoK 🇺🇸 678 178 27ms 26 Aug 2025 722nd edsrzf 🇳🇿 678 180 474ms 22 Jul 2025 723rd southpolenator 678 199 75ms 10 Jun 2023 724th southpolenator 677 151 10ms 10 Jun 2023 725th janbehrens 🇩🇪 677 176 470ms 17 Apr 2025 726th akshatj27 🇦🇶 676 121 125ms 11 Jan 2022 727th itsh01 675 136 18ms 9 Aug 2021 727th Sam-Vrgl 675 136 17ms 13 May 2025 729th Ripick 675 184 445ms 12 Jul 2025 730th lynn 675 204 1,404ms 24 Oct 2021 731st yzhs 🇩🇪 674 179 29ms 8 Feb 2020 731st urojony 🇵🇱 674 179 24ms 27 May 2021 731st raspofabs 674 179 24ms 8 Jul 2023 731st FranklinJiaChen 674 179 22ms 12 Jun 2024 731st kistlerf 🇨🇭 674 179 37ms 12 May 2025 731st LuisGoncalves05 🇵🇹 674 179 23ms 11 Jul 2025 731st jacekwladzinski 674 179 35ms 8 Oct 2025 738th janbehrens 🇩🇪 674 215 612ms 7 Jan 2022 739th MeWhenI 🇻🇦 673 141 10ms 11 Nov 2022 740th prestosilver 🇺🇸 672 185 413ms 30 Dec 2025 741st JDiLenarda 🇫🇷 672 205 1,328ms 22 Nov 2023 742nd Indivicivet 671 180 20ms 11 Mar 2021 742nd cesarm4 671 180 26ms 31 Aug 2021 742nd idoweinstein 671 180 20ms 5 Aug 2022 742nd ellis-rix 671 180 24ms 25 Aug 2022 742nd StardustGogeta 671 180 24ms 18 Aug 2023 742nd Andrey2001 671 180 27ms 23 Nov 2025 748th stefangimmillaro 670 137 17ms 12 Sep 2024 749th Yax42 🇫🇷 669 178 422ms 20 Jun 2025 750th targrik 669 233 332ms 3 Jul 2025 751st Alex-x90 🇺🇸 668 153 10ms 15 May 2023 752nd kmathis22 668 217 633ms 19 Dec 2025 753rd CaedenHarper 🇨🇦 667 156 495ms 29 Oct 2025 754th Fishron 667 181 25ms 20 Nov 2022 754th nstearns96 🇬🇧 667 181 28ms 29 Nov 2022 754th pde-bakk 🇳🇱 667 181 26ms 23 Oct 2023 754th elgan65536 🇺🇸 667 181 22ms 1 Apr 2024 754th EnTerr 667 181 24ms 8 Sep 2024 754th Josemnz 667 181 23ms 4 May 2025 760th stackotter 666 227 128ms 29 May 2023 761st Andriamanitra 🇫🇮 665 123 45ms 1 Sep 2022 762nd KatieLG 🇬🇧 665 138 16ms 16 Nov 2023 763rd Shanethegamer 🇺🇸 665 221 31ms 10 Feb 2026 764th alemelis 664 136 814ms 19 Sep 2024 765th Jonatan6 🇩🇰 664 203 89ms 3 Aug 2023 766th Alex-x90 🇺🇸 663 182 47ms 13 Feb 2023 766th cefqrn 663 182 29ms 20 May 2023 766th jeff-at-tamer-dot-codes 🇺🇸 663 182 20ms 8 Sep 2023 766th fgrosshans 🇫🇷 663 182 22ms 16 Jul 2024 770th SirBogman 🇺🇸 663 375 614ms 23 Nov 2022 771st MeWhenI 🇻🇦 661 161 168ms 30 hours ago 772nd MeWhenI 🇻🇦 661 249 170ms 13 Nov 2022 773rd Frowny 660 67 9ms 10 Jan 2022 774th skps2010 660 183 21ms 31 Dec 2018 774th asheeri 660 183 22ms 14 Aug 2021 774th TaserTheFox 🇺🇸 660 183 24ms 8 May 2023 777th olleicua 🇺🇸 659 124 52ms 19 Jan 2024 778th darkoboshkovski 659 155 9ms 12 Jun 2023 779th Mabeloid 🇳🇴 658 158 631ms 17 Sep 2024 779th dokutan 658 158 522ms 1 Feb 2026 781st p-vf 🇨🇭 658 181 406ms 21 Nov 2021 781st Shanethegamer 🇺🇸 658 181 470ms 4 Apr 2023 783rd dokutan 658 205 4,456ms 2 Feb 2026 784th MichalMarsalek 🇨🇿 657 189 463ms 22 Jan 2023 784th Shanethegamer 🇺🇸 657 189 660ms 21 Mar 2023 784th DestyNova 🇮🇪 657 189 456ms 15 Apr 2025 787th Shanethegamer 🇺🇸 657 218 115ms 11 Sep 2022 788th annaproxy 657 222 339ms 1 Aug 2022 789th Shanethegamer 🇺🇸 657 237 373ms 4 Apr 2023 790th adoxography 656 184 21ms 10 Oct 2019 790th mokymok 🇺🇸 656 184 29ms 8 Dec 2021 790th jakobkordez 🇸🇮 656 184 19ms 17 Oct 2022 790th yishayv 656 184 21ms 23 Jan 2023 790th Bmrl7 656 184 27ms 17 Feb 2024 790th jatloe 656 184 20ms 5 Oct 2024 796th jared-hughes 655 97 40ms 16 Apr 2022 797th emgordon154 655 140 26ms 2 Dec 2021 797th Lv0Sys 🇵🇱 655 140 14ms 27 Nov 2025 799th prestosilver 🇺🇸 655 156 11ms 21 Nov 2025 800th stefangimmillaro 655 182 452ms 17 Sep 2024 First Prev 721–800 of 1,913 Next Last