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 721st sean-niemann 🇺🇸 673 153 57ms 11 Jul 2024 722nd frankgraziano 672 89 3,631ms 13 Feb 2026 723rd Natanaelel 🇸🇪 670 167 305ms 10 May 2025 724th MeWhenI 🇻🇦 670 271 143ms 29 Nov 2023 725th dokutan 669 134 25ms 22 Jun 2024 726th Haksell 🇦🇶 669 142 20ms 13 Jun 2020 726th btjones0 669 142 21ms 16 Jul 2022 726th Fishron 669 142 20ms 19 Sep 2022 726th jatloe 669 142 19ms 6 Sep 2024 730th lionbryce 668 135 10ms 8 Aug 2024 731st SirBogman 🇺🇸 668 182 43ms 17 Apr 2022 732nd NewDefectus 🇮🇱 667 87 21ms 16 Oct 2021 732nd Natanaelel 🇸🇪 667 87 7ms 16 Nov 2021 732nd scpchicken 🇵🇼 667 87 19ms 24 Nov 2022 735th alexkunin 667 114 13ms 7 Jul 2019 736th janbehrens 🇩🇪 666 121 407ms 16 May 2023 737th Brianzhengca 665 143 23ms 5 Feb 2021 737th TobyBoyne 🇬🇧 665 143 20ms 14 Apr 2022 739th dvargas46 🇺🇸 664 90 209ms 23 Jan 2023 740th Shanethegamer 🇺🇸 663 128 4ms 13 Jun 2022 741st varhammer 662 121 157ms 13 Dec 2023 742nd celiendonze 🇨🇭 660 144 20ms 14 Apr 2023 742nd Bulmenisaurus 660 144 19ms 1 Jul 2024 742nd emgordon154 660 144 20ms 23 Sep 2024 745th CaedenHarper 🇨🇦 658 142 159ms 18 Aug 2025 746th CatsAreFluffy 656 94 59ms 4 Feb 2023 747th BBoehm 🇩🇪 656 116 14ms 21 Dec 2020 748th lmolteno 656 145 27ms 3 Mar 2021 748th guilhem-roy 🇫🇷 656 145 19ms 7 Mar 2022 748th jakobkordez 🇸🇮 656 145 20ms 31 Oct 2022 748th frankgraziano 656 145 20ms 24 Apr 2025 748th TheZwierzLF 🇵🇱 656 145 18ms 21 May 2025 753rd Yewzir 🇧🇪 655 123 422ms 10 Jun 2024 754th orthoplex 🇨🇽 653 68 41ms 9 Oct 2020 755th villfa 652 121 16ms 2 Nov 2018 756th 386asm 🇺🇸 652 154 44ms 5 May 2023 757th elgan65536 🇺🇸 651 146 23ms 31 Mar 2024 757th InigoK 🇺🇸 651 146 22ms 26 Aug 2025 759th snyderek 🇺🇸 651 158 60ms 9 Nov 2024 760th hyvyys 650 117 14ms 19 Sep 2020 760th aksyristos 650 117 13ms 2 Nov 2022 760th Yax42 🇫🇷 650 117 17ms 21 Jan 2026 763rd mrondon8 649 158 613ms 5 Sep 2021 764th jupj 🇫🇮 648 131 3ms 27 Aug 2022 764th plcc0 648 131 4ms 24 days ago 766th MeWhenI 🇻🇦 647 58 6ms 16 Jan 2022 767th clementblaudeau 647 147 20ms 7 Jun 2021 767th yuchuehw 647 147 20ms 3 Jan 2024 769th user189032 644 118 15ms 29 May 2019 769th cywong-amino 🇭🇰 644 118 45ms 7 Oct 2020 769th dokutan 644 118 14ms 18 Apr 2025 772nd RockOfStone 644 140 11ms 17 Mar 2024 773rd janbehrens 🇩🇪 643 160 75ms 18 May 2023 774th yokasuretsu 642 148 26ms 21 Apr 2018 774th AgathokakologicalBit 642 148 27ms 3 Aug 2019 774th TaserTheFox 🇺🇸 642 148 21ms 8 May 2023 774th adamnielson42 🇺🇸 642 148 21ms 8 Aug 2023 774th jtaxen 642 148 18ms 28 Apr 2024 774th o0BlackDragon0o 642 148 26ms 8 Sep 2024 774th Bombalech 642 148 27ms 8 Sep 2024 774th wh3n3v3r 🇨🇿 642 148 20ms 8 Nov 2024 782nd jared-hughes 640 141 11ms 16 Apr 2022 783rd CaedenHarper 🇨🇦 639 97 163ms 18 Aug 2025 784th unfinishedprogram 639 119 14ms 12 Jul 2024 785th olligobber 🇦🇺 639 175 291ms 21 May 2020 786th janbehrens 🇩🇪 637 161 549ms 16 May 2023 787th pzagrebin 636 97 58ms 25 Aug 2022 788th targrik 636 124 19ms 2 days ago 789th dokutan 635 142 12ms 29 Mar 2025 790th thisishowmymindworks 🇳🇴 634 120 15ms 5 Oct 2020 790th PatrickStephansen 🇿🇦 634 120 27ms 9 Jun 2021 790th stefangabos 🇷🇴 634 120 20ms 13 Sep 2022 793rd Yewzir 🇧🇪 634 134 4ms 10 Jun 2024 794th sambirnbaum1 634 150 20ms 6 Sep 2019 794th MaxElf999 634 150 28ms 20 Oct 2022 794th nstearns96 🇬🇧 634 150 26ms 8 Dec 2022 794th Florian-Mt 634 150 21ms 14 Nov 2023 794th FoxInTheClouds 634 150 18ms 10 Feb 2026 799th MeWhenI 🇻🇦 633 103 1,372ms 15 Sep 2025 800th Jiramide 632 177 296ms 8 Feb 2021 First Prev 721–800 of 1,514 Next Last