The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 561st Alex-x90 🇺🇸 737 183 466ms 25 Oct 2023 562nd yzhs 🇩🇪 737 198 321ms 24 Jul 2021 562nd Natanaelel 🇸🇪 737 198 318ms 2 May 2025 564th mbittner20 736 164 21ms 27 May 2023 565th stefangimmillaro 736 197 615ms 6 Oct 2025 566th p01 734 125 19ms 26 Jan 2018 566th tpiechaczek 🇵🇱 734 125 19ms 29 Jan 2020 566th thisishowmymindworks 🇳🇴 734 125 20ms 5 Oct 2020 566th MeWhenI 🇻🇦 734 125 20ms 14 Jul 2021 566th olivermrose 🇺🇸 734 125 20ms 27 Aug 2021 566th akshatj27 🇦🇶 734 125 22ms 11 Jan 2022 566th dmrichwa 🇺🇸 734 125 22ms 16 Apr 2022 566th DialFrost 🇸🇬 734 125 20ms 26 Sep 2023 566th two-bad 🇬🇧 734 125 23ms 23 Nov 2023 566th dylanarmstrong 734 125 19ms 10 Dec 2023 566th kkoenig 734 125 21ms 23 Dec 2023 566th nsprd 734 125 19ms 18 Jan 2024 566th helbling 🇨🇭 734 125 28ms 21 Mar 2024 566th duckyluuk 🇳🇱 734 125 20ms 3 Oct 2024 566th XenThe 🇬🇧 734 125 18ms 12 Jun 2025 566th acollett89 734 125 20ms 4 Aug 2025 566th iczelia 🇩🇪 734 125 20ms 10 Oct 2025 583rd Yewzir 🇧🇪 733 159 17ms 16 Oct 2023 584th edsrzf 🇳🇿 733 177 33ms 7 days ago 585th m-tkach 🇺🇦 732 142 475ms 25 Jan 2024 586th YoungjuneKwon 732 165 26ms 19 Dec 2018 586th neihousaigaai 732 165 23ms 6 Oct 2024 588th MeWhenI 🇻🇦 731 91 90ms 7 Jul 2024 588th Steffan153 🇫🇮 731 91 87ms 9 Jul 2024 590th prplz 🇦🇺 731 163 440ms 21 Nov 2021 591st DialFrost 🇸🇬 729 112 3,569ms 17 Apr 2025 592nd rucin93 🇵🇱 729 160 58ms 20 Aug 2025 593rd Shanethegamer 🇺🇸 729 167 156ms 4 Apr 2023 594th strout 729 200 342ms 16 Aug 2022 595th vang1ong7ang 728 126 19ms 29 Oct 2021 596th MeWhenI 🇻🇦 728 176 9ms 16 Jun 2023 597th primo-ppcg 🇹🇭 726 136 14ms 3 Jul 2023 598th MeWhenI 🇻🇦 726 164 460ms 16 Jun 2023 599th anter69 🇭🇺 725 125 1,397ms 13 Mar 2025 600th Yewzir 🇧🇪 725 141 11ms 16 Feb 2024 601st lynn 723 92 96ms 13 Mar 2023 601st sisyphus-ppcg 🇦🇺 723 92 80ms 14 Mar 2023 601st Yewzir 🇧🇪 723 92 79ms 6 Mar 2024 604th ludwig-n 723 167 22ms 6 Apr 2021 605th efgen 722 127 17ms 26 Dec 2023 606th zygoloid 721 187 71ms 11 Aug 2024 607th namelessiw 721 201 501ms 8 Oct 2025 608th Indivicivet 720 67 21ms 30 Mar 2021 608th KatieLG 🇬🇧 720 67 21ms 24 May 2021 610th stefangimmillaro 720 169 140ms 29 Nov 2022 611th jfallon1997 719 168 27ms 15 Aug 2022 611th mathisfun271 719 168 27ms 16 Dec 2023 611th dirckvdende 719 168 25ms 6 Jul 2025 614th TheEric0802 🇩🇪 719 172 18ms 22 Sep 2023 615th elgan65536 🇺🇸 719 229 279ms 28 Mar 2024 616th boxjelly 718 203 348ms 23 Feb 2021 616th HallMatthew314 718 203 371ms 14 Feb 2022 618th anter69 🇭🇺 717 114 41ms 31 Jan 2022 619th dokutan 717 202 620ms 13 Jan 2026 620th DialFrost 🇸🇬 717 367 1,561ms 17 Apr 2025 621st nwellnhof 🇩🇪 716 114 822ms 23 Jul 2023 622nd annaproxy 715 93 81ms 16 Mar 2023 623rd SniperSmiley 🇺🇸 714 169 20ms 29 Jun 2022 624th sean-niemann 🇺🇸 713 167 410ms 10 Jan 2024 625th fantaize 713 231 191ms 15 days ago 626th olivermrose 🇺🇸 711 115 50ms 13 Sep 2021 627th targrik 711 129 58ms 4 Sep 2025 628th Yewzir 🇧🇪 711 219 348ms 5 Jan 2024 629th Yewzir 🇧🇪 710 170 24ms 3 Jun 2024 629th HumanoidCPU 710 170 27ms 31 Oct 2024 629th keelimeguy 🇺🇸 710 170 63ms 17 May 2025 629th Kyogre-Primal 🇺🇦 710 170 22ms 28 May 2025 633rd MeWhenI 🇻🇦 710 215 56ms 29 Apr 2025 634th adyache 🇺🇸 708 150 93ms 12 Jun 2023 635th jared-hughes 708 181 6ms 18 Jul 2022 636th DialFrost 🇸🇬 707 134 288ms 15 Aug 2024 637th janbehrens 🇩🇪 706 140 15ms 12 Nov 2023 638th TobyBoyne 🇬🇧 706 171 36ms 26 Feb 2021 638th amollberg 🇸🇪 706 171 22ms 18 Jan 2022 638th wuduculfre 706 171 26ms 29 Jul 2025 First Prev 561–640 of 1,912 Next Last
