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?
Niven Numbers (Long) 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 640th GolfingSuccess 🇬🇷 900 59 26ms 11 Sep 2025 642nd Lydxn 🇨🇦 900 75 4ms 15 Jul 2023 642nd Steffan153 🇫🇮 900 75 4ms 22 Jul 2023 642nd GrayJoKing 🇦🇺 900 75 4ms 26 Jul 2023 642nd typeswitch-dev 🇵🇹 900 75 4ms 17 Aug 2023 642nd sean-niemann 🇺🇸 900 75 4ms 11 Jun 2025 642nd fuzzylojik-golf 🇺🇸 900 75 4ms 18 Sep 2025 648th Shanethegamer 🇺🇸 899 64 178ms 13 Aug 2022 649th zacjl 899 70 29ms 51 mins ago 650th kg583 🇺🇸 899 86 81ms 19 Dec 2024 651st GrayJoKing 🇦🇺 898 65 1,309ms 14 Aug 2022 651st primo-ppcg 🇹🇭 898 65 1,265ms 4 Sep 2022 651st Shanethegamer 🇺🇸 898 65 1,340ms 7 Mar 2023 651st MeWhenI 🇻🇦 898 65 1,313ms 8 Jun 2023 651st lynn 898 65 1,231ms 16 Jul 2023 656th arctouch-cristiannevianna 898 71 410ms 15 Jun 2023 656th leth4 898 71 422ms 5 Jul 2023 656th malworthy 898 71 443ms 25 Oct 2023 656th Mikey-Beep 🇬🇧 898 71 424ms 23 Jul 2025 660th MeWhenI 🇻🇦 897 69 38ms 21 Feb 2023 661st DialFrost 🇸🇬 895 92 17ms 14 Apr 2025 661st UnderKoen 🇳🇱 895 92 17ms 15 Apr 2025 663rd primo-ppcg 🇹🇭 893 64 40ms 4 Sep 2022 664th GrayJoKing 🇦🇺 892 80 27ms 2 Jan 2023 664th MeWhenI 🇻🇦 892 80 28ms 21 Feb 2023 664th m-tkach 🇺🇦 892 80 28ms 2 Jun 2023 664th lynn 892 80 28ms 16 Jul 2023 664th Yewzir 🇧🇪 892 80 27ms 10 Apr 2024 669th DialFrost 🇸🇬 891 64 10ms 21 Feb 2026 669th Steffan153 🇫🇮 891 64 10ms 21 Feb 2026 669th GrayJoKing 🇦🇺 891 64 10ms 25 Feb 2026 672nd GrayJoKing 🇦🇺 890 85 60ms 14 Aug 2022 672nd primo-ppcg 🇹🇭 890 85 53ms 7 Dec 2022 672nd inventshah 890 85 54ms 26 Jan 2023 672nd m-tkach 🇺🇦 890 85 54ms 2 Jun 2023 672nd snyderek 🇺🇸 890 85 59ms 24 Nov 2024 677th yzhs 🇩🇪 889 41 41ms 21 Jun 2023 677th adoxography 889 41 42ms 19 Nov 2023 677th Ralac07 🇦🇺 889 41 40ms 13 Jun 2024 680th Maznek 889 54 41ms 22 Jun 2023 681st ovs-code 🇩🇪 889 76 4ms 15 Jul 2023 682nd sisyphus-ppcg 🇦🇺 888 45 1,953ms 2 Nov 2023 683rd Waffle3z 888 62 3ms 8 Aug 2022 683rd GrayJoKing 🇦🇺 888 62 3ms 13 Aug 2022 683rd jared-hughes 888 62 3ms 13 Aug 2022 683rd primo-ppcg 🇹🇭 888 62 3ms 4 Sep 2022 683rd sean-niemann 🇺🇸 888 62 3ms 11 Apr 2023 683rd pardouin 🇫🇷 888 62 3ms 21 Oct 2024 683rd fuzzylojik-golf 🇺🇸 888 62 3ms 3 Jul 2025 683rd Steffan153 🇫🇮 888 62 3ms 11 Feb 2026 691st GrayJoKing 🇦🇺 888 66 3ms 14 Aug 2022 691st primo-ppcg 🇹🇭 888 66 2ms 4 Sep 2022 691st inventshah 888 66 4ms 26 Jan 2023 691st m-tkach 🇺🇦 888 66 2ms 2 Jun 2023 691st b-illy 🇬🇧 888 66 2ms 15 Dec 2025 696th MeWhenI 🇻🇦 888 86 46ms 11 Feb 2025 697th inventshah 887 51 437ms 16 Jan 2024 697th GolfingSuccess 🇬🇷 887 51 461ms 20 Jan 2024 697th ridingqwerty 🇺🇸 887 51 411ms 22 Jan 2024 697th Yewzir 🇧🇪 887 51 429ms 24 Feb 2024 697th neel11235813 887 51 419ms 10 Mar 2024 697th duckyluuk 🇳🇱 887 51 400ms 27 Mar 2024 697th b-illy 🇬🇧 887 51 491ms 9 Sep 2024 697th emgordon154 887 51 452ms 13 Apr 2025 697th Babafaba 887 51 442ms 17 Oct 2025 706th SirBogman 🇺🇸 887 55 17ms 8 Aug 2022 706th RDShah 887 55 21ms 9 Aug 2022 706th OllieBoyne 🇬🇧 887 55 17ms 12 Aug 2022 706th TobyBoyne 🇬🇧 887 55 16ms 12 Aug 2022 706th dzshn 887 55 18ms 17 Aug 2022 706th HETHAT 🇩🇿 887 55 17ms 18 Aug 2022 706th Fishron 887 55 17ms 29 Sep 2022 706th CheeseCake628 🇳🇴 887 55 17ms 19 Mar 2023 706th 4ndyJ 🇬🇧 887 55 17ms 20 Mar 2023 706th InigoK 🇺🇸 887 55 17ms 25 Apr 2023 706th Andriamanitra 🇫🇮 887 55 17ms 20 Jul 2023 706th namelessiw 887 55 18ms 5 Mar 2024 706th jtaxen 887 55 18ms 26 Mar 2024 706th rollershutter 887 55 17ms 4 Jul 2024 706th LostSyntax21 🇬🇧 887 55 16ms 10 Sep 2024 First Prev 641–720 of 2,542 Next Last