The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 241st JayXon 🇺🇸 889 117 601ms 2 Feb 2024 242nd Steffan153 🇫🇮 889 128 475ms 26 Jul 2024 243rd ovs-code 🇩🇪 889 164 325ms 27 Jan 2024 244th rucin93 🇵🇱 888 108 200ms 31 Oct 2024 244th sean-niemann 🇺🇸 888 108 210ms 8 Jan 2025 246th xnor-gate 888 136 361ms 4 Dec 2021 246th GolfingSuccess 🇬🇷 888 136 20ms 17 Apr 2022 248th dokutan 885 58 216ms 2 Nov 2025 249th ovs-code 🇩🇪 885 107 20ms 4 Oct 2024 250th primo-ppcg 🇹🇭 885 186 188ms 9 Jan 2020 251st primo-ppcg 🇹🇭 884 108 1,406ms 17 Apr 2025 252nd MeWhenI 🇻🇦 884 171 141ms 16 Jun 2023 253rd clockworknazo 883 140 20ms 27 Feb 2023 254th edsrzf 🇳🇿 881 98 1,173ms 7 Sep 2025 255th pardouin 🇫🇷 881 118 485ms 27 Jun 2024 255th sean-niemann 🇺🇸 881 118 530ms 6 Jun 2025 255th Steffan153 🇫🇮 881 118 441ms 13 Feb 2026 258th primo-ppcg 🇹🇭 881 131 44ms 24 Jun 2022 259th davitf 881 137 19ms 28 Jul 2020 259th orthoplex 🇨🇽 881 137 23ms 13 Jan 2022 261st Lydxn 🇨🇦 880 89 66ms 17 Apr 2022 261st JayXon 🇺🇸 880 89 66ms 17 Apr 2022 261st prplz 🇦🇺 880 89 65ms 17 Apr 2022 261st MeWhenI 🇻🇦 880 89 68ms 18 Apr 2022 261st sean-niemann 🇺🇸 880 89 65ms 22 Jun 2022 261st primo-ppcg 🇹🇭 880 89 68ms 26 Jun 2022 261st emplv 🇱🇻 880 89 68ms 30 Jun 2022 261st Steffan153 🇫🇮 880 89 68ms 20 Feb 2023 261st MostParsingVex 880 89 66ms 10 Oct 2024 261st DialFrost 🇸🇬 880 89 68ms 23 Dec 2024 261st Natanaelel 🇸🇪 880 89 69ms 7 May 2025 261st edsrzf 🇳🇿 880 89 65ms 25 Jul 2025 273rd JayXon 🇺🇸 879 93 46ms 27 Dec 2024 274th sean-niemann 🇺🇸 879 108 26ms 31 Oct 2023 275th GrayJoKing 🇦🇺 878 139 562ms 14 Jul 2024 276th edsrzf 🇳🇿 877 122 13ms 22 Jul 2025 277th Steffan153 🇫🇮 877 141 17ms 27 Feb 2023 277th xsot 🇸🇬 877 141 11ms 29 Mar 2024 279th edsrzf 🇳🇿 876 139 131ms 21 Jul 2025 280th nwellnhof 🇩🇪 876 154 487ms 30 May 2024 281st IanUtley 875 137 49ms 4 Nov 2023 282nd nwellnhof 🇩🇪 875 138 20ms 28 Jun 2023 282nd minhtrancccp 875 138 20ms 26 Nov 2024 284th primo-ppcg 🇹🇭 874 109 1,008ms 27 Mar 2019 285th edsrzf 🇳🇿 874 164 14ms 21 Jul 2025 286th xsot 🇸🇬 872 99 1,149ms 16 Feb 2026 287th edsrzf 🇳🇿 872 158 1,326ms 22 Jul 2025 288th pardouin 🇫🇷 871 104 1,442ms 26 Aug 2025 289th DialFrost 🇸🇬 871 142 12ms 15 Apr 2025 290th sean-niemann 🇺🇸 870 140 142ms 25 Apr 2025 291st m-tkach 🇺🇦 870 201 128ms 10 Jun 2025 292nd edsrzf 🇳🇿 869 169 34ms 2 Feb 2026 293rd lynn 868 168 350ms 5 Oct 2021 293rd HPWiz 🇳🇿 868 168 364ms 17 Apr 2022 295th MeWhenI 🇻🇦 867 145 73ms 29 Dec 2024 296th primo-ppcg 🇹🇭 867 176 44ms 14 Jan 2025 297th Steffan153 🇫🇮 863 105 1,468ms 7 Apr 2023 298th Irratix 🇳🇱 862 56 21ms 28 Aug 2021 298th inverseLorentz 🇦🇺 862 56 19ms 9 Apr 2024 298th MostParsingVex 862 56 21ms 13 Oct 2024 301st sean-niemann 🇺🇸 862 132 513ms 31 Aug 2025 302nd Seek64 🇩🇪 862 140 27ms 3 Feb 2025 303rd Steffan153 🇫🇮 861 95 43ms 30 May 2024 304th xsot 🇸🇬 860 149 11ms 10 Oct 2023 305th GrayJoKing 🇦🇺 860 151 25ms 23 days ago 306th SirBogman 🇺🇸 859 79 351ms 5 Oct 2020 307th canissimia 🇦🇶 859 195 11ms 14 Aug 2021 308th Yewzir 🇧🇪 857 80 51ms 22 Dec 2023 308th msbranicky 857 80 46ms 24 Dec 2023 310th nwellnhof 🇩🇪 857 107 26ms 30 May 2024 310th JayXon 🇺🇸 857 107 14ms 21 Sep 2024 312th MeWhenI 🇻🇦 857 124 95ms 25 Aug 2023 313th DialFrost 🇸🇬 857 142 136ms 15 Apr 2025 314th emgordon154 857 204 240ms 22 May 2025 315th Steffan153 🇫🇮 856 125 12ms 20 Aug 2023 316th marcin7Cd 856 141 22ms 27 Jun 2020 316th ryyyn 🇺🇸 856 141 22ms 9 Oct 2025 318th primo-ppcg 🇹🇭 856 161 1,391ms 30 Nov 2021 318th edsrzf 🇳🇿 856 161 131ms 13 Dec 2025 320th JayXon 🇺🇸 854 106 1,526ms 21 Dec 2021 First Prev 241–320 of 1,913 Next Last