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 881st emgordon154 629 181 3,365ms 9 Aug 2025 882nd hellwue 629 192 22ms 22 Nov 2023 882nd ballaire 629 192 40ms 27 Jan 2024 884th legrottagliegionata 628 146 22ms 7 Dec 2021 885th MarcMush 🇫🇷 627 144 831ms 11 Jan 2024 886th chris124567 626 249 384ms 21 Apr 2021 887th evanrittner 625 193 22ms 9 Mar 2019 887th argusdusty 🇺🇸 625 193 35ms 31 Dec 2020 887th Bonjour27891 🇻🇳 625 193 39ms 13 Mar 2022 887th AtengChen 625 193 23ms 16 Aug 2024 887th JunkIce 625 193 21ms 4 Nov 2024 892nd Phil-RGOMEGA 625 205 8ms 2 Jun 2023 893rd xyangst 624 147 14ms 26 Sep 2024 893rd trinityy-7 624 147 19ms 26 Jan 2026 895th MeWhenI 🇻🇦 624 199 804ms 27 Jul 2024 896th Shanethegamer 🇺🇸 622 172 15ms 5 Oct 2024 897th Psirving 622 194 24ms 31 Jul 2020 897th j-Ewan 622 194 22ms 14 Feb 2022 897th Dandandooo 622 194 21ms 19 Apr 2025 900th daniel-pedersen 🇸🇪 620 148 18ms 6 Mar 2022 900th stop-amertime 620 148 16ms 5 Dec 2022 902nd P-Quentin 🇫🇷 619 195 29ms 5 Aug 2022 902nd BREMAUCY 🇫🇷 619 195 21ms 4 Feb 2023 902nd cros107 🇦🇺 619 195 26ms 7 Jun 2023 902nd m42km 619 195 24ms 14 Jan 2024 902nd WillConker 619 195 20ms 10 Aug 2024 902nd Troon 619 195 21ms 19 Aug 2025 902nd zgialor-lab 619 195 27ms 27 Feb 2026 909th MeWhenI 🇻🇦 618 146 386ms 15 Feb 2023 910th MeWhenI 🇻🇦 618 223 1,374ms 16 Jun 2023 911th DialFrost 🇸🇬 616 102 8ms 15 Apr 2025 912th daisy-lau 616 149 15ms 13 Jul 2020 912th satowine1 616 149 14ms 7 Dec 2021 912th Ashikpaul 🇮🇳 616 149 15ms 29 Jul 2022 912th Maznek 616 149 20ms 21 Jun 2023 916th wilkij1 616 196 19ms 16 Jun 2018 916th lukasthaler 616 196 24ms 9 Sep 2020 916th asadullayev 616 196 22ms 4 Mar 2021 916th geooff 616 196 22ms 11 Sep 2023 916th RaBa21 🇭🇺 616 196 22ms 17 Jul 2025 916th BlankSpruce 616 196 24ms 31 Aug 2025 922nd bac0id 616 219 445ms 3 Jul 2024 923rd vonagam 615 133 48ms 12 Nov 2017 924th Shanethegamer 🇺🇸 615 237 332ms 23 Feb 2023 925th labster 614 161 3,943ms 15 Mar 2018 926th BrenSchaap 613 197 21ms 21 Oct 2021 926th aksyristos 613 197 24ms 27 Jan 2023 926th ABC00012345 613 197 23ms 1 May 2024 926th michaelmgreer 613 197 22ms 9 Oct 2025 930th arjanadriaanse 🇳🇱 613 238 348ms 7 Feb 2022 931st albanian-laundromat 612 141 1,470ms 22 Nov 2025 931st dokutan 612 141 1,290ms 3 Feb 2026 933rd unfinishedprogram 612 150 15ms 19 Jan 2024 934th janbehrens 🇩🇪 612 186 498ms 24 Mar 2022 935th MeWhenI 🇻🇦 611 155 32ms 16 Aug 2024 936th ccbrown 611 255 393ms 21 Apr 2020 937th dokutan 610 109 84ms 22 Jan 2024 938th zdzc 610 198 23ms 26 Mar 2018 938th Florian-Mt 610 198 24ms 14 Nov 2023 938th l-donovan 610 198 21ms 6 Feb 2024 941st duckyluuk 🇳🇱 609 187 3,241ms 26 Oct 2024 942nd Tezaruz 608 151 18ms 20 Dec 2023 942nd itserasmus 608 151 22ms 25 Jan 2024 942nd olleicua 🇺🇸 608 151 16ms 16 Feb 2024 945th Andrey2001 608 171 600ms 26 Nov 2025 946th davidwangd 608 240 327ms 6 Apr 2025 947th lelbal 607 199 19ms 7 Aug 2025 947th qpwoeirut 607 199 17ms 14 Aug 2025 947th karadigm01 607 199 19ms 20 days ago 950th hrrs01 606 135 46ms 21 Sep 2018 950th sapphyrus 606 135 39ms 18 Feb 2020 952nd MeWhenI 🇻🇦 606 163 66ms 3 Jul 2023 953rd KevinMarquette 🇺🇸 605 135 1,375ms 17 Apr 2022 954th msbranicky 605 172 634ms 19 Jan 2024 955th omurakazuaki 🇯🇵 604 152 14ms 15 Feb 2021 955th biocommando 🇫🇮 604 152 19ms 19 Aug 2023 955th hacker112 🇸🇪 604 152 15ms 19 Jun 2024 955th eTrey13 604 152 15ms 3 Feb 2025 955th SOONwasTaken 604 152 14ms 1 Oct 2025 960th hoodadam 604 200 17ms 5 Jun 2019 First Prev 881–960 of 1,913 Next Last