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 chars. 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 Chars Time Submitted 147th DialFrost 🇸🇬 938 73 32ms 2 Jan 2026 162nd nwellnhof 🇩🇪 937 127 502ms 29 Jun 2023 162nd JayXon 🇺🇸 937 127 438ms 29 Jun 2023 164th sean-niemann 🇺🇸 936 92 41ms 6 Jun 2025 165th inventshah 936 144 660ms 24 Jan 2023 165th JayXon 🇺🇸 936 144 457ms 6 Feb 2023 165th ovs-code 🇩🇪 936 144 2,970ms 18 May 2025 168th lifthrasiir 🇰🇷 934 71 99ms 30 Nov 2024 168th jared-hughes 934 71 100ms 15 Dec 2024 170th ovs-code 🇩🇪 932 68 39ms 24 Mar 2023 171st sisyphus-ppcg 🇦🇺 931 106 22ms 2 Jul 2023 172nd m-tkach 🇺🇦 930 84 84ms 10 Jan 2024 172nd error256 930 84 87ms 5 Jan 2025 174th JayXon 🇺🇸 929 83 596ms 30 Dec 2023 175th SirBogman 🇺🇸 928 58 346ms 23 Jan 2024 176th JayXon 🇺🇸 928 156 576ms 25 Sep 2025 177th magnusmalm 927 52 16ms 29 Apr 2018 177th t8rsalad 927 52 23ms 17 Aug 2018 177th yzhs 🇩🇪 927 52 17ms 29 Feb 2020 177th alexhuntley 927 52 22ms 11 Apr 2021 177th mhgockel 927 52 20ms 26 Apr 2023 177th vindarel 927 52 21ms 15 Apr 2024 183rd JayXon 🇺🇸 926 93 42ms 5 Oct 2021 183rd GolfingSuccess 🇬🇷 926 93 20ms 17 Apr 2022 185th nwellnhof 🇩🇪 923 146 470ms 23 Jul 2023 186th ovs-code 🇩🇪 921 72 99ms 8 Jul 2024 187th xsot 🇸🇬 919 85 450ms 14 May 2024 188th orthoplex 🇨🇽 916 94 23ms 9 Oct 2022 189th Argeento 🇵🇱 916 95 39ms 8 Oct 2020 190th primo-ppcg 🇹🇭 916 168 337ms 27 May 2020 191st saito-ta 🇯🇵 915 104 20ms 20 Oct 2023 192nd primo-ppcg 🇹🇭 913 99 1,490ms 24 Dec 2021 193rd Steffan153 🇫🇮 911 160 339ms 9 Feb 2024 194th canissimia 🇦🇶 910 82 53ms 18 Oct 2022 195th Steffan153 🇫🇮 909 92 1,205ms 14 Feb 2026 196th pardouin 🇫🇷 908 86 480ms 12 Jul 2024 196th Steffan153 🇫🇮 908 86 423ms 26 Feb 2026 198th sean-niemann 🇺🇸 906 83 207ms 10 Sep 2024 199th JayXon 🇺🇸 906 96 16ms 18 Jan 2025 200th Waffle3z 906 128 19ms 17 Apr 2022 201st DialFrost 🇸🇬 905 101 11ms 16 Apr 2025 201st xsot 🇸🇬 905 101 11ms 6 Jul 2025 201st edsrzf 🇳🇿 905 101 18ms 12 Nov 2025 204th nwellnhof 🇩🇪 905 160 579ms 25 Sep 2025 205th nwellnhof 🇩🇪 905 170 396ms 28 Jun 2023 206th JayXon 🇺🇸 904 182 194ms 7 Dec 2022 207th GrayJoKing 🇦🇺 903 83 29ms 27 May 2022 208th primo-ppcg 🇹🇭 903 105 13ms 18 Nov 2022 208th xsot 🇸🇬 903 105 5ms 10 Jun 2023 210th Steffan153 🇫🇮 903 126 3,331ms 14 days ago 210th pardouin 🇫🇷 903 126 3,417ms 13 days ago 212th JayXon 🇺🇸 900 171 330ms 23 Jul 2023 213th sean-niemann 🇺🇸 899 93 1,273ms 24 Feb 2026 214th edsrzf 🇳🇿 899 138 431ms 23 Jul 2025 215th sean-niemann 🇺🇸 898 87 483ms 6 Jun 2025 216th GrayJoKing 🇦🇺 897 60 398ms 23 Aug 2020 217th DialFrost 🇸🇬 897 74 97ms 12 May 2025 218th kg583 🇺🇸 897 96 24ms 15 Mar 2024 219th JayXon 🇺🇸 895 84 143ms 21 Sep 2024 220th ovs-code 🇩🇪 895 127 510ms 4 Aug 2024 221st JayXon 🇺🇸 894 119 166ms 24 May 2025 222nd Steffan153 🇫🇮 894 136 135ms 27 days ago 223rd GrayJoKing 🇦🇺 893 104 769ms 2 Jun 2022 224th edsrzf 🇳🇿 892 106 34ms 22 Jul 2025 225th synt7x 🇺🇸 892 130 10ms 4 Jul 2025 226th dvargas46 🇺🇸 889 107 1,317ms 22 Jan 2023 227th Steffan153 🇫🇮 889 131 13ms 16 Feb 2026 228th ovs-code 🇩🇪 889 164 325ms 27 Jan 2024 229th dpethes 888 88 89ms 10 Jan 2024 229th JayXon 🇺🇸 888 88 446ms 2 Feb 2024 229th GolfingSuccess 🇬🇷 888 88 466ms 25 Jan 2025 232nd emplv 🇱🇻 888 98 26ms 19 Jan 2025 233rd inventshah 888 115 11ms 24 Jan 2023 234th Steffan153 🇫🇮 888 128 475ms 26 Jul 2024 235th Steffan153 🇫🇮 887 103 17ms 26 Feb 2023 236th FortuiteMan 🇫🇷 886 45 106ms 7 Oct 2024 237th primo-ppcg 🇹🇭 885 186 188ms 9 Jan 2020 238th dokutan 883 58 216ms 2 Nov 2025 239th ovs-code 🇩🇪 883 107 20ms 4 Oct 2024 240th primo-ppcg 🇹🇭 883 108 1,406ms 17 Apr 2025 First Prev 161–240 of 1,907 Next Last