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 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 561st Lydxn 🇨🇦 916 68 38ms 9 Aug 2022 561st GrayJoKing 🇦🇺 916 68 37ms 13 Aug 2022 561st primo-ppcg 🇹🇭 916 68 37ms 4 Sep 2022 561st JayXon 🇺🇸 916 68 37ms 9 Sep 2022 561st sean-niemann 🇺🇸 916 68 38ms 21 Apr 2023 561st Yewzir 🇧🇪 916 68 37ms 10 Apr 2024 561st Steffan153 🇫🇮 916 68 37ms 2 Aug 2024 561st pardouin 🇫🇷 916 68 37ms 8 Apr 2025 561st DialFrost 🇸🇬 916 68 36ms 11 Apr 2025 561st fuzzylojik-golf 🇺🇸 916 68 37ms 6 Sep 2025 571st sisyphus-ppcg 🇦🇺 916 78 125ms 8 Aug 2022 571st GrayJoKing 🇦🇺 916 78 134ms 14 Aug 2022 571st primo-ppcg 🇹🇭 916 78 123ms 4 Sep 2022 571st stefangimmillaro 916 78 133ms 7 Jun 2023 571st MeWhenI 🇻🇦 916 78 124ms 8 Aug 2023 571st rucin93 🇵🇱 916 78 148ms 11 Dec 2023 571st Yewzir 🇧🇪 916 78 123ms 10 Apr 2024 571st lynn 916 78 136ms 7 Jul 2024 579th JayXon 🇺🇸 915 72 470ms 8 Aug 2022 579th ovs-code 🇩🇪 915 72 475ms 8 Aug 2022 579th Lydxn 🇨🇦 915 72 458ms 8 Aug 2022 579th Steffan153 🇫🇮 915 72 457ms 4 Jan 2023 579th Shanethegamer 🇺🇸 915 72 454ms 8 Mar 2023 579th sean-niemann 🇺🇸 915 72 459ms 21 Jan 2025 579th fuzzylojik-golf 🇺🇸 915 72 431ms 19 Aug 2025 579th Yax42 🇫🇷 915 72 465ms 5 Oct 2025 579th snoozingnewt 🇨🇦 915 72 476ms 10 Dec 2025 588th Lydxn 🇨🇦 914 63 39ms 11 Nov 2022 588th marshallward 🇺🇸 914 63 39ms 11 Nov 2022 590th arctouch-cristiannevianna 914 71 410ms 15 Jun 2023 590th leth4 914 71 422ms 5 Jul 2023 590th malworthy 914 71 443ms 25 Oct 2023 590th Mikey-Beep 🇬🇧 914 71 424ms 23 Jul 2025 594th prplz 🇦🇺 913 51 138ms 12 Dec 2022 594th Steffan153 🇫🇮 913 51 143ms 15 Aug 2024 596th MeWhenI 🇻🇦 913 81 492ms 7 Nov 2025 597th KrausRaus 🇺🇸 911 34 77ms 12 Aug 2022 597th primo-ppcg 🇹🇭 911 34 69ms 22 Jan 2025 599th nwellnhof 🇩🇪 911 40 4,219ms 9 Mar 2023 599th HumanEquivalentUnit 911 40 4,327ms 24 Oct 2023 599th dcgjb 911 40 4,325ms 23 Jan 2024 599th DialFrost 🇸🇬 911 40 4,694ms 10 Oct 2024 603rd inventshah 911 51 437ms 16 Jan 2024 603rd GolfingSuccess 🇬🇷 911 51 461ms 20 Jan 2024 603rd ridingqwerty 🇺🇸 911 51 411ms 22 Jan 2024 603rd neel11235813 911 51 419ms 10 Mar 2024 603rd duckyluuk 🇳🇱 911 51 400ms 27 Mar 2024 603rd b-illy 🇬🇧 911 51 491ms 9 Sep 2024 603rd emgordon154 911 51 452ms 13 Apr 2025 603rd Babafaba 911 51 518ms 17 Oct 2025 611th AlephSquirrel 911 54 12ms 23 Apr 2023 611th ovs-code 🇩🇪 911 54 12ms 10 Dec 2023 613th chunes3 🇺🇸 911 56 75ms 15 Sep 2023 613th 4hg 🇺🇸 911 56 75ms 17 Sep 2023 613th Lydxn 🇨🇦 911 56 74ms 28 Sep 2023 613th Yewzir 🇧🇪 911 56 67ms 7 Mar 2024 617th sisyphus-ppcg 🇦🇺 911 62 93ms 8 Aug 2022 617th GrayJoKing 🇦🇺 911 62 89ms 14 Aug 2022 617th primo-ppcg 🇹🇭 911 62 88ms 4 Sep 2022 617th steffan-polygolf 911 62 103ms 19 Feb 2023 617th MeWhenI 🇻🇦 911 62 83ms 21 Feb 2023 617th stefangimmillaro 911 62 92ms 15 Apr 2023 617th Yewzir 🇧🇪 911 62 105ms 10 Apr 2024 624th eranws 910 53 39ms 1 Nov 2022 625th Lydxn 🇨🇦 910 55 4ms 15 Jan 2024 625th Yewzir 🇧🇪 910 55 4ms 18 Nov 2025 625th GrayJoKing 🇦🇺 910 55 3ms 19 Nov 2025 628th sisyphus-ppcg 🇦🇺 910 63 123ms 8 Aug 2022 628th GrayJoKing 🇦🇺 910 63 123ms 14 Aug 2022 628th primo-ppcg 🇹🇭 910 63 121ms 4 Sep 2022 628th steffan-polygolf 910 63 125ms 19 Feb 2023 628th MeWhenI 🇻🇦 910 63 123ms 21 Feb 2023 628th Yewzir 🇧🇪 910 63 125ms 10 Apr 2024 634th sisyphus-ppcg 🇦🇺 910 103 289ms 8 Aug 2022 634th GrayJoKing 🇦🇺 910 103 281ms 14 Aug 2022 636th Lv0Sys 🇵🇱 908 43 356ms 7 Dec 2025 636th snoozingnewt 🇨🇦 908 43 362ms 10 Dec 2025 638th GrayJoKing 🇦🇺 908 59 25ms 5 Feb 2025 638th GolfingSuccess 🇬🇷 908 59 26ms 11 Sep 2025 640th Lydxn 🇨🇦 908 79 28ms 13 Jan 2023 First Prev 561–640 of 2,560 Next Last