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 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 384th ovs-code 🇩🇪 943 42 438ms 15 Jul 2025 384th kg583 🇺🇸 943 42 409ms 26 Jul 2025 384th Babafaba 943 42 486ms 26 Nov 2025 404th prplz 🇦🇺 942 61 123ms 13 Jan 2022 404th GrayJoKing 🇦🇺 942 61 124ms 13 Jan 2022 404th JayXon 🇺🇸 942 61 121ms 13 Jan 2022 404th Lydxn 🇨🇦 942 61 123ms 13 Jan 2022 404th primo-ppcg 🇹🇭 942 61 120ms 14 Jan 2022 404th sisyphus-ppcg 🇦🇺 942 61 126ms 17 Jan 2022 404th lynn 942 61 125ms 10 Mar 2022 404th Bubbler-4 942 61 116ms 8 Aug 2022 404th MeWhenI 🇻🇦 942 61 125ms 10 Oct 2022 404th clockworknazo 942 61 116ms 12 Oct 2022 404th andersk 🇺🇸 942 61 115ms 22 Oct 2022 404th Steffan153 🇫🇮 942 61 123ms 17 Nov 2022 404th stefangimmillaro 942 61 126ms 25 Nov 2022 404th sean-niemann 🇺🇸 942 61 128ms 17 Jan 2023 404th DialFrost 🇸🇬 942 61 116ms 18 Jan 2023 404th rucin93 🇵🇱 942 61 121ms 23 Jan 2023 404th Shanethegamer 🇺🇸 942 61 124ms 8 Mar 2023 404th ovs-code 🇩🇪 942 61 125ms 20 Jun 2023 404th Yewzir 🇧🇪 942 61 121ms 23 Sep 2023 404th Betuaredead 942 61 116ms 11 Nov 2023 404th elgan65536 🇺🇸 942 61 123ms 5 Mar 2024 404th pardouin 🇫🇷 942 61 127ms 22 Aug 2024 404th nullie 942 61 134ms 18 Dec 2024 404th acotis 942 61 120ms 26 Jan 2025 404th emgordon154 942 61 127ms 18 Feb 2025 404th fuzzylojik-golf 🇺🇸 942 61 129ms 17 Jun 2025 404th edsrzf 🇳🇿 942 61 131ms 26 Jul 2025 404th qpwoeirut 942 61 121ms 16 Aug 2025 404th kumavale 942 61 133ms 17 Aug 2025 404th albanian-laundromat 942 61 130ms 24 Sep 2025 404th snoozingnewt 🇨🇦 942 61 123ms 4 Dec 2025 404th dokutan 942 61 121ms 24 days ago 404th madex 🇩🇪 942 61 120ms 8 days ago 437th primo-ppcg 🇹🇭 941 50 1ms 18 Feb 2021 437th michael-pruglo 🇺🇦 941 50 1ms 13 Jul 2022 437th ovs-code 🇩🇪 941 50 2ms 8 Oct 2023 437th Mandrzejy 🇵🇱 941 50 1ms 17 Apr 2024 437th qwertyuiop3 🇷🇺 941 50 2ms 14 May 2025 437th b-illy 🇬🇧 941 50 1ms 5 Jun 2025 437th madex 🇩🇪 941 50 2ms 8 days ago 444th Lydxn 🇨🇦 941 68 56ms 1 Jan 2022 444th prplz 🇦🇺 941 68 58ms 1 Jan 2022 444th JayXon 🇺🇸 941 68 56ms 5 Jan 2022 444th sisyphus-ppcg 🇦🇺 941 68 52ms 23 Mar 2022 444th nwellnhof 🇩🇪 941 68 51ms 8 Aug 2022 444th Steffan153 🇫🇮 941 68 58ms 17 Nov 2022 444th inventshah 941 68 57ms 26 Jan 2023 444th sean-niemann 🇺🇸 941 68 59ms 11 Apr 2023 444th Alex-x90 🇺🇸 941 68 55ms 17 Jul 2023 444th xsot 🇸🇬 941 68 58ms 22 May 2024 444th KasperKivimaeki 🇫🇮 941 68 58ms 15 Feb 2025 444th pardouin 🇫🇷 941 68 58ms 31 May 2025 444th fuzzylojik-golf 🇺🇸 941 68 59ms 14 Jul 2025 444th 09cf 941 68 57ms 26 Nov 2025 444th Herbert00709 🇵🇱 941 68 58ms 6 days ago 459th rak1507 🇬🇧 939 21 2ms 12 Jan 2022 459th Garklein 🇨🇦 939 21 2ms 15 Jan 2022 459th Bubbler-4 939 21 2ms 16 Jan 2022 459th HPWiz 🇳🇿 939 21 2ms 18 Jan 2022 459th GrayJoKing 🇦🇺 939 21 2ms 2 Feb 2022 459th lynn 939 21 2ms 2 Jun 2022 459th shadowninja55 🇺🇸 939 21 2ms 28 Dec 2022 459th DialFrost 🇸🇬 939 21 2ms 2 Feb 2024 459th SirBogman 🇺🇸 939 21 2ms 12 Feb 2024 459th bstrat 939 21 2ms 5 Aug 2024 459th copy 939 21 2ms 16 Aug 2024 459th zacjl 939 21 2ms 17 Aug 2024 459th Steffan153 🇫🇮 939 21 2ms 18 Aug 2024 459th sean-niemann 🇺🇸 939 21 2ms 11 Apr 2025 459th pardouin 🇫🇷 939 21 2ms 15 Apr 2025 459th fuzzylojik-golf 🇺🇸 939 21 2ms 6 Sep 2025 475th edre 939 46 10ms 15 May 2018 475th davitf 939 46 11ms 24 Oct 2018 475th rschwa6308 🇺🇸 939 46 11ms 4 Apr 2019 475th zbreit 🇺🇸 939 46 10ms 4 Apr 2019 475th petar-donchev 939 46 10ms 24 Aug 2019 475th daedals 939 46 11ms 15 Oct 2019 First Prev 401–480 of 4,220 Next Last