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?
Emirp Numbers 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 867th CommandLeo 🇮🇹 684 79 10ms 23 Dec 2025 867th lelbal 684 79 10ms 6 Feb 2026 883rd primo-ppcg 🇹🇭 684 109 2ms 3 Oct 2020 883rd MeWhenI 🇻🇦 684 109 2ms 20 Apr 2022 885th jjatria 683 54 124ms 29 Jul 2022 886th iznax 683 82 391ms 21 Nov 2021 886th tkr-sh 🇰🇵 683 82 401ms 14 Jun 2022 888th alomiF 681 97 170ms 24 Aug 2024 889th MeWhenI 🇻🇦 679 95 2ms 20 Feb 2023 890th primo-ppcg 🇹🇭 679 102 25ms 13 Jul 2021 890th JayXon 🇺🇸 679 102 25ms 13 Sep 2023 892nd doge1338 678 83 11ms 20 Mar 2021 892nd GrayJoKing 🇦🇺 678 83 319ms 30 Mar 2021 892nd two-bad 🇬🇧 678 83 11ms 15 Feb 2024 895th sisyphus-ppcg 🇦🇺 677 63 1,294ms 23 Mar 2022 895th dokutan 677 63 1,207ms 14 Apr 2024 897th ovs-code 🇩🇪 677 95 464ms 16 Jun 2024 898th StanislavNikolov 676 80 10ms 26 Nov 2017 898th LlamaLad7 🇬🇧 676 80 15ms 17 Jan 2021 898th voidmax 676 80 9ms 1 Dec 2021 898th ejini6969 676 80 12ms 1 Apr 2023 898th SB-945 676 80 26ms 13 Feb 2024 898th TheSecondComing123 676 80 10ms 4 Feb 2026 904th boxjelly 675 98 236ms 5 Jan 2021 904th tobeannouncd 675 98 157ms 9 Jan 2024 906th nwellnhof 🇩🇪 672 101 446ms 25 Sep 2025 907th cure-honey 🇯🇵 672 121 44ms 6 Jul 2021 908th molecules 671 55 93ms 27 Dec 2017 909th MeWhenI 🇻🇦 671 98 1ms 29 Nov 2022 910th f-tucker 671 144 7ms 20 Feb 2024 911th ian-odonnell 670 84 10ms 5 Mar 2018 911th LordSir101 670 84 11ms 10 Sep 2025 913th MeWhenI 🇻🇦 670 85 5ms 29 May 2023 913th targrik 670 85 5ms 28 Jul 2025 915th Yewzir 🇧🇪 669 118 3ms 19 Nov 2025 916th MeWhenI 🇻🇦 668 75 419ms 24 May 2024 917th fruno-bulax 668 99 146ms 16 Feb 2019 918th dokutan 668 140 309ms 1 Apr 2024 919th emgordon154 667 44 51ms 13 Sep 2024 920th Espiobest 667 81 23ms 26 Feb 2021 920th gilufin 667 81 15ms 23 May 2021 920th Waffle3z 667 81 10ms 7 Sep 2021 920th quimey 667 81 17ms 21 Jun 2023 924th pardouin 🇫🇷 666 62 903ms 29 Aug 2025 925th ovs-code 🇩🇪 666 67 226ms 12 Mar 2024 926th emgordon154 666 79 144ms 4 Aug 2024 927th olivermrose 🇺🇸 665 60 35ms 31 Oct 2021 928th dokutan 663 97 462ms 23 Jul 2025 929th MateuszPietrzak 🇵🇱 663 107 59ms 9 Jan 2024 929th HumanoidCPU 663 107 53ms 5 May 2024 929th ovs-code 🇩🇪 663 107 61ms 3 Jun 2024 932nd jakobwitte 662 85 11ms 20 Mar 2018 932nd janbehrens 🇩🇪 662 85 13ms 17 Aug 2021 934th dokutan 661 98 3ms 26 Dec 2025 935th ashtraypettingzoo 🇺🇸 661 100 150ms 12 Feb 2023 936th 5quiwyrm 659 53 242ms 2 Sep 2025 937th AlephSquirrel 659 76 516ms 19 Jul 2024 938th jmerle 🇳🇱 659 82 13ms 11 Jul 2023 938th Powerroff 659 82 24ms 10 Nov 2024 938th RaBa21 🇭🇺 659 82 14ms 19 Jul 2025 941st sisyphus-ppcg 🇦🇺 659 125 1ms 15 May 2022 941st GolfingSuccess 🇬🇷 659 125 1ms 16 May 2022 941st MeWhenI 🇻🇦 659 125 1ms 18 May 2022 941st ovs-code 🇩🇪 659 125 1ms 20 May 2022 941st inventshah 659 125 1ms 22 May 2022 941st lynn 659 125 1ms 27 May 2022 941st nwellnhof 🇩🇪 659 125 1ms 7 Jul 2022 941st galloj 🇨🇿 659 125 1ms 29 Aug 2022 941st Steffan153 🇫🇮 659 125 1ms 28 Jan 2023 941st sean-niemann 🇺🇸 659 125 1ms 20 May 2023 941st JayXon 🇺🇸 659 125 1ms 25 May 2023 941st Lydxn 🇨🇦 659 125 1ms 24 Jun 2023 941st dokutan 659 125 1ms 2 Oct 2023 941st retrohun 659 125 1ms 22 Jan 2024 941st kritixilithos 659 125 1ms 22 May 2024 941st pardouin 🇫🇷 659 125 1ms 21 Sep 2024 941st DialFrost 🇸🇬 659 125 1ms 5 Jan 2025 941st stefangimmillaro 659 125 1ms 14 Jul 2025 941st fuzzylojik-golf 🇺🇸 659 125 1ms 2 Sep 2025 960th emplv 🇱🇻 656 86 110ms 26 Oct 2022 First Prev 881–960 of 3,185 Next Last
