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 481st xsot 🇸🇬 778 127 21ms 19 Apr 2025 482nd HumanoidCPU 778 159 16ms 11 Jun 2024 483rd MeWhenI 🇻🇦 777 339 1,738ms 10 Feb 2025 484th Jeremy-Stafford 776 188 361ms 29 Mar 2023 485th OllieBoyne 🇬🇧 774 156 22ms 27 Jan 2021 485th jacklynnepenick 774 156 400ms 14 Aug 2021 485th ZorblaxV 774 156 20ms 10 Jan 2025 485th plcc0 774 156 47ms 12 Jan 2026 489th btnlq 773 155 24ms 4 Dec 2021 490th stefangimmillaro 773 213 183ms 4 Jun 2025 491st RussellEmerine 772 189 328ms 2 Jan 2020 492nd blaztoma 🇱🇹 771 119 14ms 4 Oct 2025 493rd neel11235813 770 135 577ms 12 Mar 2024 493rd lifthrasiir 🇰🇷 770 135 542ms 2 Dec 2024 495th dokutan 769 52 105ms 6 Apr 2025 496th yanjs 769 157 20ms 30 Sep 2021 497th CatsAreFluffy 766 104 55ms 7 Mar 2025 498th snoozingnewt 🇨🇦 766 180 121ms 13 Dec 2025 499th tayloia 🇬🇧 765 120 33ms 15 May 2023 500th RyanMHsiao 765 287 1,777ms 25 Sep 2024 501st DialFrost 🇸🇬 764 149 514ms 15 Apr 2025 502nd commandz0 🇺🇸 764 158 23ms 21 May 2023 502nd mediocr3 764 158 22ms 19 Jul 2023 502nd Mabeloid 🇳🇴 764 158 21ms 17 Sep 2024 502nd andrewjc2000 764 158 22ms 10 Jul 2025 506th KasperKivimaeki 🇫🇮 763 134 8ms 19 Aug 2025 507th MeWhenI 🇻🇦 763 326 104ms 19 Jul 2025 508th SirBogman 🇺🇸 762 58 8ms 22 Mar 2022 509th DialFrost 🇸🇬 762 153 24ms 16 Apr 2025 509th edsrzf 🇳🇿 762 153 23ms 1 Sep 2025 511th GrayJoKing 🇦🇺 762 163 419ms 24 Jul 2025 512th lifthrasiir 🇰🇷 760 72 49ms 30 Nov 2024 513th sean-niemann 🇺🇸 760 130 23ms 30 May 2025 514th snoozingnewt 🇨🇦 759 137 572ms 23 days ago 515th PiterAnnema 759 159 28ms 30 Aug 2020 515th Irratix 🇳🇱 759 159 615ms 28 Apr 2022 515th StefanHabel 🇨🇦 759 159 25ms 11 Nov 2022 515th stacksparrow4 759 159 25ms 29 Aug 2023 519th solmyr2000 758 178 515ms 19 Jun 2022 520th prplz 🇦🇺 757 135 9ms 19 Apr 2021 521st GolfingSuccess 🇬🇷 756 88 79ms 14 Feb 2025 522nd marcin7Cd 756 193 361ms 24 Jan 2021 523rd DialFrost 🇸🇬 756 200 285ms 16 Apr 2025 524th SirBogman 🇺🇸 756 202 47ms 16 Apr 2022 525th edsrzf 🇳🇿 755 218 224ms 22 Jul 2025 526th KatieLG 🇬🇧 754 160 25ms 19 Apr 2025 527th GrayJoKing 🇦🇺 754 170 42ms 22 Jul 2025 528th prplz 🇦🇺 753 179 2,862ms 9 Jan 2022 529th lukegustafson 🇺🇸 752 122 19ms 16 May 2024 530th ognen98 751 136 10ms 12 Jun 2023 531st Shanethegamer 🇺🇸 751 193 440ms 24 Sep 2025 532nd AGoyet 750 161 22ms 26 Jul 2022 532nd anter69 🇭🇺 750 161 42ms 20 Nov 2023 532nd NDR0216 🇹🇼 750 161 20ms 4 Jul 2024 532nd zhaohm14 750 161 20ms 6 Jun 2025 536th nat-418 750 165 16ms 3 Nov 2022 537th Steffan153 🇫🇮 748 132 24ms 8 Aug 2024 538th snoozingnewt 🇨🇦 748 202 132ms 20 Nov 2025 539th DialFrost 🇸🇬 747 194 483ms 24 Sep 2025 540th janbehrens 🇩🇪 745 128 69ms 21 Jan 2021 541st inventshah 745 153 3,207ms 26 Oct 2024 542nd AdrienHache 🇫🇷 745 160 474ms 25 Aug 2025 543rd Shanethegamer 🇺🇸 745 162 22ms 17 Apr 2022 543rd inventshah 745 162 22ms 24 Jan 2023 543rd tobyLovick 745 162 22ms 7 Dec 2023 546th iakolzin 745 181 462ms 30 Jun 2022 547th prplz 🇦🇺 743 110 39ms 19 Apr 2021 547th denkyuu1 743 110 44ms 2 days ago 549th DialFrost 🇸🇬 743 133 23ms 16 Apr 2025 550th Stockoh 🇫🇷 743 140 553ms 15 Jun 2024 551st MeWhenI 🇻🇦 742 164 145ms 26 Oct 2022 552nd jwhear 🇺🇸 742 296 1,805ms 30 Sep 2024 553rd annaproxy 741 163 21ms 21 Feb 2022 553rd duckyluuk 🇳🇱 741 163 51ms 7 Jul 2025 553rd ndren 741 163 345ms 19 Oct 2025 553rd M4rc0g1 741 163 20ms 22 Nov 2025 557th justecorruptio 740 124 24ms 14 Apr 2018 558th tomtheisen 🇺🇸 740 161 446ms 1 Feb 2023 559th flawr 740 197 364ms 1 Mar 2019 560th m-tkach 🇺🇦 738 199 33ms 9 Feb 2026 First Prev 481–560 of 1,913 Next Last