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 640th Steffan153 🇫🇮 908 79 27ms 28 Jul 2024 640th pardouin 🇫🇷 908 79 28ms 21 Oct 2024 640th DialFrost 🇸🇬 908 79 28ms 11 Apr 2025 640th sean-niemann 🇺🇸 908 79 27ms 19 May 2025 640th fuzzylojik-golf 🇺🇸 908 79 27ms 26 Dec 2025 646th JayXon 🇺🇸 907 97 24ms 10 Nov 2022 646th Lydxn 🇨🇦 907 97 24ms 11 Nov 2022 646th Steffan153 🇫🇮 907 97 25ms 28 Jul 2024 646th sean-niemann 🇺🇸 907 97 24ms 1 Aug 2024 646th DialFrost 🇸🇬 907 97 27ms 11 Apr 2025 646th fuzzylojik-golf 🇺🇸 907 97 26ms 12 Aug 2025 652nd Sp3000 🇦🇺 906 54 17ms 8 Aug 2022 652nd GolfingSuccess 🇬🇷 906 54 17ms 8 Aug 2022 652nd 051 🇸🇬 906 54 18ms 8 Aug 2022 652nd CubeyTheCube 906 54 17ms 8 Aug 2022 652nd ZakkkkAttackkkk 🇵🇭 906 54 16ms 8 Aug 2022 652nd jared-hughes 906 54 18ms 9 Aug 2022 652nd annaproxy 906 54 18ms 9 Aug 2022 652nd BlankSpruce 906 54 17ms 17 Aug 2022 652nd prplz 🇦🇺 906 54 17ms 19 Aug 2022 652nd bob-th 906 54 18ms 22 Aug 2022 652nd TFeld00 🇩🇰 906 54 17ms 3 Oct 2022 652nd bricknellj 906 54 16ms 31 Oct 2022 652nd thehylian 906 54 16ms 27 Dec 2022 652nd janbehrens 🇩🇪 906 54 17ms 11 Jul 2023 652nd AlexanderFair 906 54 17ms 12 Jul 2023 652nd fkantelberg 906 54 16ms 18 Jul 2023 652nd FlorianCassayre 🇫🇷 906 54 17ms 28 Sep 2023 652nd ndren 906 54 17ms 9 Oct 2023 652nd neel11235813 906 54 18ms 20 Oct 2023 652nd ridingqwerty 🇺🇸 906 54 17ms 22 Dec 2023 652nd bzijlema 🇳🇱 906 54 16ms 12 Jan 2024 652nd jhu04 906 54 18ms 18 Jan 2024 652nd duckyluuk 🇳🇱 906 54 17ms 24 Jan 2024 652nd 5cw 🇺🇸 906 54 17ms 5 Mar 2024 652nd Lewenhaupt 906 54 18ms 22 Mar 2024 652nd Grrisly 906 54 16ms 25 Mar 2024 652nd Yewzir 🇧🇪 906 54 16ms 4 Jun 2024 652nd b-illy 🇬🇧 906 54 16ms 8 Aug 2024 652nd quarl 906 54 16ms 13 Nov 2024 652nd lifthrasiir 🇰🇷 906 54 16ms 13 Nov 2024 652nd ryyyn 🇺🇸 906 54 17ms 6 Jan 2025 652nd wen1now 906 54 17ms 19 Jan 2025 652nd plcc0 906 54 17ms 20 Feb 2025 652nd Pyroan 906 54 16ms 3 Mar 2025 652nd Languag3 906 54 17ms 6 Mar 2025 652nd emgordon154 906 54 17ms 13 Apr 2025 652nd andrewjc2000 906 54 17ms 15 Apr 2025 652nd keelimeguy 🇺🇸 906 54 17ms 6 May 2025 652nd jipsong 🇩🇪 906 54 17ms 20 Jun 2025 652nd KasperKivimaeki 🇫🇮 906 54 16ms 30 Jun 2025 652nd wuduculfre 906 54 16ms 21 Jul 2025 652nd albanian-laundromat 906 54 18ms 18 Aug 2025 652nd YAJUE114514 906 54 17ms 24 Aug 2025 652nd davecame 906 54 17ms 19 Sep 2025 652nd Babafaba 906 54 16ms 17 Oct 2025 652nd luuumine 🇫🇷 906 54 17ms 20 Oct 2025 652nd j-zhang43 906 54 17ms 17 Nov 2025 652nd solisolu 906 54 17ms 25 Nov 2025 652nd tomh1012 906 54 18ms 3 Dec 2025 652nd Lv0Sys 🇵🇱 906 54 17ms 7 Dec 2025 652nd edsrzf 🇳🇿 906 54 17ms 25 Dec 2025 652nd FoxInTheClouds 906 54 16ms 8 Feb 2026 652nd error256 906 54 13ms 16 days ago 705th Lydxn 🇨🇦 906 62 141ms 9 Aug 2022 705th Shanethegamer 🇺🇸 906 62 130ms 9 Aug 2022 705th Steffan153 🇫🇮 906 62 136ms 6 Dec 2022 705th jipsong 🇩🇪 906 62 140ms 6 May 2025 709th Lydxn 🇨🇦 906 75 4ms 15 Jul 2023 709th Steffan153 🇫🇮 906 75 4ms 22 Jul 2023 709th GrayJoKing 🇦🇺 906 75 4ms 26 Jul 2023 709th typeswitch-dev 🇵🇹 906 75 4ms 17 Aug 2023 709th sean-niemann 🇺🇸 906 75 4ms 11 Jun 2025 709th fuzzylojik-golf 🇺🇸 906 75 4ms 18 Sep 2025 715th ovs-code 🇩🇪 905 65 3ms 4 Nov 2023 715th xsot 🇸🇬 905 65 3ms 12 Jun 2024 717th sisyphus-ppcg 🇦🇺 904 63 140ms 8 Aug 2022 717th GrayJoKing 🇦🇺 904 63 139ms 14 Aug 2022 717th primo-ppcg 🇹🇭 904 63 143ms 4 Sep 2022 717th MeWhenI 🇻🇦 904 63 139ms 21 Feb 2023 First Prev 641–720 of 2,560 Next Last