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?
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 801st Shanethegamer 🇺🇸 653 163 175ms 24 May 2025 802nd nsprd 652 185 25ms 19 Jan 2024 802nd DxSper 652 185 34ms 16 Feb 2024 802nd driri85 652 185 30ms 16 Feb 2024 802nd OCNeve 652 185 19ms 18 Jun 2024 802nd croc54 652 185 21ms 31 Jan 2025 802nd Alpha9584 652 185 20ms 20 Mar 2025 802nd Hemanthred2005 652 185 25ms 3 May 2025 802nd GodlyProgrammer1 652 185 25ms 28 Nov 2025 810th jared-hughes 651 141 25ms 10 Sep 2021 810th Andrey-Plotnikov 651 141 13ms 25 Oct 2024 812th Jonatan6 🇩🇰 651 157 11ms 4 Aug 2023 813th BlankSpruce 651 207 463ms 26 Aug 2022 814th HumanoidCPU 650 160 521ms 31 Oct 2024 814th KatieLG 🇬🇧 650 160 506ms 19 Apr 2025 816th HumanoidCPU 650 223 664ms 8 Nov 2025 817th Shanethegamer 🇺🇸 649 139 395ms 8 Jan 2022 818th TheAristos 649 186 30ms 21 Oct 2019 818th CorporalCrawdad 649 186 21ms 3 Oct 2024 820th lynn 648 185 30ms 23 Nov 2021 821st FlyingPenguin223 647 198 6ms 30 Nov 2024 822nd uttumuttu 🇫🇮 646 142 26ms 4 Jan 2022 822nd iliazeus 646 142 19ms 3 Sep 2022 822nd LukeBridges 🇬🇧 646 142 23ms 28 Oct 2022 825th Shanethegamer 🇺🇸 646 147 35ms 5 Nov 2022 826th TheZwierzLF 🇵🇱 646 161 591ms 13 Dec 2025 827th DialFrost 🇸🇬 645 140 471ms 25 May 2024 828th Yewzir 🇧🇪 645 165 225ms 13 Sep 2023 829th rowboat1 645 187 25ms 3 Apr 2021 829th rschwa6308 🇺🇸 645 187 66ms 18 Aug 2023 829th albanian-laundromat 645 187 21ms 24 Apr 2025 829th bogosorter 645 187 43ms 11 Jul 2025 829th celiendonze 🇨🇭 645 187 24ms 7 Nov 2025 834th nsprd 645 209 501ms 19 Jan 2024 835th MeWhenI 🇻🇦 643 159 10ms 25 Aug 2023 836th mamamia5x 642 143 14ms 8 Mar 2024 837th Yewzir 🇧🇪 642 162 566ms 21 Feb 2024 838th kevinmchung 642 188 35ms 2 Feb 2018 838th jhfranklin 🇬🇧 642 188 25ms 7 Mar 2021 838th ehulinsky 🇺🇸 642 188 20ms 8 May 2023 838th eiburns 642 188 20ms 3 Oct 2023 838th Just4FunCoder 642 188 40ms 18 Jun 2025 843rd mtirado1 641 200 6ms 25 Dec 2022 844th JGDoerrer 641 257 182ms 15 Feb 2022 845th Waffle3z 639 128 60ms 17 Jan 2021 845th hugolgst 639 128 43ms 4 Jun 2021 847th ay2718 639 189 29ms 14 Aug 2019 847th Kloppermand 🇩🇰 639 189 21ms 10 Jun 2020 847th martinnorling 🇸🇪 639 189 23ms 3 Mar 2022 847th ThijsLuttikhuis 639 189 28ms 3 Mar 2024 847th tri1212 🇻🇳 639 189 598ms 30 Jun 2024 847th emgordon154 639 189 31ms 24 Sep 2024 847th Mathrew2012 639 189 17ms 24 May 2025 854th jared-hughes 639 211 477ms 24 Jun 2022 855th kkoenig 639 244 320ms 30 Dec 2023 856th FireyFly 637 144 20ms 14 Apr 2018 856th KrausRaus 🇺🇸 637 144 23ms 23 Oct 2020 856th didion0 🇺🇸 637 144 15ms 22 Apr 2021 856th NewDefectus 🇮🇱 637 144 16ms 8 Oct 2021 856th raphaelimahorn 637 144 17ms 26 Oct 2022 861st emplv 🇱🇻 636 245 353ms 29 Apr 2024 862nd LogicalJoe 635 190 34ms 24 May 2023 862nd moustave 635 190 31ms 7 Apr 2025 864th Babafaba 634 164 550ms 24 Nov 2025 865th KatieLG 🇬🇧 633 143 1,620ms 17 Nov 2023 866th garrisonhh 632 191 20ms 21 Nov 2020 866th geofft 632 191 41ms 10 Dec 2020 866th CedricGebistorf 632 191 23ms 18 Feb 2022 866th Educorreia932 632 191 23ms 23 Jun 2022 866th Ripick 632 191 25ms 6 May 2023 866th anarconic 632 191 470ms 14 Dec 2023 866th jeff-re 632 191 22ms 6 May 2025 866th nemoyatpeace 632 191 26ms 8 Jan 2026 874th emgordon154 631 152 158ms 15 Nov 2024 875th albanian-laundromat 631 227 10ms 14 Jul 2025 876th okaponta 631 261 202ms 13 Jan 2024 877th TeodorDyakov 🇧🇬 630 230 554ms 8 Jan 2026 878th Haksell 🇦🇶 629 130 54ms 5 Apr 2020 878th Natanaelel 🇸🇪 629 130 46ms 7 May 2025 880th emgordon154 629 181 3,365ms 9 Aug 2025 First Prev 801–880 of 1,912 Next Last