The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 560th GrayJoKing 🇦🇺 916 68 37ms 13 Aug 2022 560th primo-ppcg 🇹🇭 916 68 37ms 4 Sep 2022 560th JayXon 🇺🇸 916 68 37ms 9 Sep 2022 560th sean-niemann 🇺🇸 916 68 38ms 21 Apr 2023 560th Yewzir 🇧🇪 916 68 37ms 10 Apr 2024 560th Steffan153 🇫🇮 916 68 37ms 2 Aug 2024 560th pardouin 🇫🇷 916 68 37ms 8 Apr 2025 560th DialFrost 🇸🇬 916 68 36ms 11 Apr 2025 560th fuzzylojik-golf 🇺🇸 916 68 37ms 6 Sep 2025 570th sisyphus-ppcg 🇦🇺 916 78 128ms 8 Aug 2022 570th GrayJoKing 🇦🇺 916 78 128ms 14 Aug 2022 570th primo-ppcg 🇹🇭 916 78 125ms 4 Sep 2022 570th stefangimmillaro 916 78 123ms 7 Jun 2023 570th MeWhenI 🇻🇦 916 78 127ms 8 Aug 2023 570th rucin93 🇵🇱 916 78 126ms 11 Dec 2023 570th Yewzir 🇧🇪 916 78 122ms 10 Apr 2024 570th lynn 916 78 127ms 7 Jul 2024 578th JayXon 🇺🇸 915 72 470ms 8 Aug 2022 578th ovs-code 🇩🇪 915 72 475ms 8 Aug 2022 578th Lydxn 🇨🇦 915 72 458ms 8 Aug 2022 578th Steffan153 🇫🇮 915 72 457ms 4 Jan 2023 578th Shanethegamer 🇺🇸 915 72 454ms 8 Mar 2023 578th sean-niemann 🇺🇸 915 72 459ms 21 Jan 2025 578th fuzzylojik-golf 🇺🇸 915 72 431ms 19 Aug 2025 578th Yax42 🇫🇷 915 72 465ms 5 Oct 2025 578th snoozingnewt 🇨🇦 915 72 476ms 10 Dec 2025 587th Lydxn 🇨🇦 914 63 39ms 11 Nov 2022 587th marshallward 🇺🇸 914 63 39ms 11 Nov 2022 589th arctouch-cristiannevianna 914 71 410ms 15 Jun 2023 589th leth4 914 71 422ms 5 Jul 2023 589th malworthy 914 71 443ms 25 Oct 2023 589th Mikey-Beep 🇬🇧 914 71 424ms 23 Jul 2025 593rd prplz 🇦🇺 913 51 138ms 12 Dec 2022 593rd Steffan153 🇫🇮 913 51 143ms 15 Aug 2024 595th MeWhenI 🇻🇦 913 81 492ms 7 Nov 2025 596th KrausRaus 🇺🇸 911 34 77ms 12 Aug 2022 596th primo-ppcg 🇹🇭 911 34 69ms 22 Jan 2025 598th nwellnhof 🇩🇪 911 40 4,219ms 9 Mar 2023 598th HumanEquivalentUnit 911 40 4,327ms 24 Oct 2023 598th dcgjb 911 40 4,325ms 23 Jan 2024 598th DialFrost 🇸🇬 911 40 4,694ms 10 Oct 2024 602nd inventshah 911 51 437ms 16 Jan 2024 602nd GolfingSuccess 🇬🇷 911 51 461ms 20 Jan 2024 602nd ridingqwerty 🇺🇸 911 51 411ms 22 Jan 2024 602nd neel11235813 911 51 419ms 10 Mar 2024 602nd duckyluuk 🇳🇱 911 51 400ms 27 Mar 2024 602nd b-illy 🇬🇧 911 51 491ms 9 Sep 2024 602nd emgordon154 911 51 452ms 13 Apr 2025 602nd Babafaba 911 51 518ms 17 Oct 2025 610th AlephSquirrel 911 54 12ms 23 Apr 2023 610th ovs-code 🇩🇪 911 54 12ms 10 Dec 2023 612th chunes3 🇺🇸 911 56 75ms 15 Sep 2023 612th 4hg 🇺🇸 911 56 75ms 17 Sep 2023 612th Lydxn 🇨🇦 911 56 74ms 28 Sep 2023 612th Yewzir 🇧🇪 911 56 67ms 7 Mar 2024 616th sisyphus-ppcg 🇦🇺 911 62 85ms 8 Aug 2022 616th GrayJoKing 🇦🇺 911 62 78ms 14 Aug 2022 616th primo-ppcg 🇹🇭 911 62 78ms 4 Sep 2022 616th steffan-polygolf 911 62 86ms 19 Feb 2023 616th MeWhenI 🇻🇦 911 62 82ms 21 Feb 2023 616th stefangimmillaro 911 62 87ms 15 Apr 2023 616th Yewzir 🇧🇪 911 62 85ms 10 Apr 2024 623rd eranws 910 53 38ms 1 Nov 2022 624th Lydxn 🇨🇦 910 55 4ms 15 Jan 2024 624th Yewzir 🇧🇪 910 55 4ms 18 Nov 2025 624th GrayJoKing 🇦🇺 910 55 3ms 19 Nov 2025 627th sisyphus-ppcg 🇦🇺 910 63 123ms 8 Aug 2022 627th GrayJoKing 🇦🇺 910 63 123ms 14 Aug 2022 627th primo-ppcg 🇹🇭 910 63 121ms 4 Sep 2022 627th steffan-polygolf 910 63 125ms 19 Feb 2023 627th MeWhenI 🇻🇦 910 63 123ms 21 Feb 2023 627th Yewzir 🇧🇪 910 63 125ms 10 Apr 2024 633rd sisyphus-ppcg 🇦🇺 910 103 289ms 8 Aug 2022 633rd GrayJoKing 🇦🇺 910 103 281ms 14 Aug 2022 635th Lv0Sys 🇵🇱 908 43 356ms 7 Dec 2025 635th snoozingnewt 🇨🇦 908 43 362ms 10 Dec 2025 637th GrayJoKing 🇦🇺 908 59 25ms 5 Feb 2025 637th GolfingSuccess 🇬🇷 908 59 26ms 11 Sep 2025 639th Lydxn 🇨🇦 908 79 28ms 13 Jan 2023 639th Steffan153 🇫🇮 908 79 27ms 28 Jul 2024 First Prev 561–640 of 2,559 Next Last