The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Niven Numbers 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 627th Herbert00709 🇵🇱 945 68 58ms 6 days ago 642nd thospel 943 29 3ms 3 May 2018 642nd nwellnhof 🇩🇪 943 29 3ms 15 Feb 2020 642nd saito-ta 🇯🇵 943 29 3ms 16 Aug 2024 642nd xsot 🇸🇬 943 29 3ms 24 Jun 2025 646th Lydxn 🇨🇦 943 42 1ms 30 Oct 2022 646th btnlq 943 42 1ms 5 Nov 2022 646th clockworknazo 943 42 1ms 18 Nov 2022 646th primo-ppcg 🇹🇭 943 42 1ms 19 Nov 2022 646th sisyphus-ppcg 🇦🇺 943 42 1ms 22 Feb 2023 646th xsot 🇸🇬 943 42 1ms 16 May 2023 646th fuzzylojik-golf 🇺🇸 943 42 2ms 12 Aug 2025 646th sean-niemann 🇺🇸 943 42 2ms 27 Aug 2025 646th DialFrost 🇸🇬 943 42 3ms 19 Dec 2025 646th canissimia 🇦🇶 943 42 1ms 16 Jan 2026 646th Steffan153 🇫🇮 943 42 2ms 24 days ago 657th HPWiz 🇳🇿 942 39 1,023ms 9 Mar 2022 658th AdrienHache 🇫🇷 942 41 45ms 12 Sep 2024 659th edre 942 46 10ms 15 May 2018 659th davitf 942 46 11ms 24 Oct 2018 659th rschwa6308 🇺🇸 942 46 11ms 4 Apr 2019 659th zbreit 🇺🇸 942 46 10ms 4 Apr 2019 659th petar-donchev 942 46 10ms 24 Aug 2019 659th daedals 942 46 11ms 15 Oct 2019 659th teafork 942 46 9ms 9 Feb 2020 659th andersk 🇺🇸 942 46 12ms 19 Mar 2020 659th Attero 🇸🇪 942 46 10ms 26 Mar 2020 659th dmoa 942 46 10ms 10 Jul 2020 659th hashkitten 942 46 10ms 24 Sep 2020 659th Dazza314 🇬🇧 942 46 10ms 7 Nov 2020 659th janbehrens 🇩🇪 942 46 9ms 8 Dec 2020 659th btjones0 942 46 10ms 27 Dec 2020 659th OllieBoyne 🇬🇧 942 46 10ms 6 Feb 2021 659th vezzick 942 46 10ms 5 Mar 2021 659th RDShah 942 46 9ms 15 Apr 2021 659th urojony 🇵🇱 942 46 10ms 27 May 2021 659th MarcMush 🇫🇷 942 46 10ms 29 Jun 2021 659th Fishron 942 46 9ms 19 Oct 2021 659th Indivicivet 942 46 10ms 24 Oct 2021 659th StefanHabel 🇨🇦 942 46 9ms 14 Dec 2021 659th ZakkkkAttackkkk 🇵🇭 942 46 9ms 20 Dec 2021 659th Irratix 🇳🇱 942 46 9ms 17 Apr 2022 659th k3w1k0d3r 942 46 11ms 25 Jun 2022 659th 051 🇸🇬 942 46 10ms 8 Aug 2022 659th TobyBoyne 🇬🇧 942 46 9ms 12 Aug 2022 659th MichalMarsalek 🇨🇿 942 46 10ms 29 Aug 2022 659th JaimeCoderIO 942 46 9ms 29 Sep 2022 659th IshanPanpaliya 942 46 10ms 19 Oct 2022 659th FlorianCassayre 🇫🇷 942 46 10ms 6 Nov 2022 659th thehylian 942 46 10ms 30 Dec 2022 659th Techdude01 942 46 9ms 18 Jan 2023 659th SirFireball3521 942 46 10ms 9 Feb 2023 659th scpchicken 🇵🇼 942 46 10ms 22 Feb 2023 659th kellantech 942 46 9ms 2 Jun 2023 659th lillian314159 942 46 10ms 13 Jul 2023 659th Alex-x90 🇺🇸 942 46 10ms 17 Jul 2023 659th AlexanderFair 942 46 9ms 24 Jul 2023 659th gXLg 🇩🇪 942 46 12ms 23 Sep 2023 659th ridingqwerty 🇺🇸 942 46 10ms 22 Dec 2023 659th bzijlema 🇳🇱 942 46 10ms 12 Jan 2024 659th jhu04 942 46 10ms 18 Jan 2024 659th bob-th 942 46 9ms 2 Feb 2024 659th elgan65536 🇺🇸 942 46 10ms 5 Mar 2024 659th Lewenhaupt 942 46 10ms 22 Mar 2024 659th jmfk 942 46 10ms 22 Mar 2024 659th jtaxen 942 46 11ms 5 Apr 2024 659th 5cw 🇺🇸 942 46 12ms 5 May 2024 659th bizy-coder 942 46 10ms 15 Aug 2024 659th jatloe 942 46 10ms 26 Aug 2024 659th croc54 942 46 10ms 18 Nov 2024 659th lifthrasiir 🇰🇷 942 46 10ms 3 Dec 2024 659th andrewjc2000 942 46 10ms 3 Mar 2025 659th keelimeguy 🇺🇸 942 46 9ms 6 May 2025 659th Artemis21 🇬🇧 942 46 10ms 23 May 2025 659th dirckvdende 942 46 10ms 20 Jul 2025 659th qpwoeirut 942 46 10ms 13 Aug 2025 659th InigoK 🇺🇸 942 46 10ms 8 Sep 2025 659th ahmetdemirag 🇨🇾 942 46 10ms 1 Oct 2025 659th luuumine 🇫🇷 942 46 9ms 17 Oct 2025 659th butnaruteodor 942 46 9ms 30 Oct 2025 First Prev 641–720 of 4,246 Next Last