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?
Abundant Numbers (Long) 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 471st tayloia 🇬🇧 892 55 11ms 12 Jan 2023 471st DialFrost 🇸🇬 892 55 11ms 8 Feb 2023 471st thisishowmymindworks 🇳🇴 892 55 11ms 11 May 2023 471st PatrickStephansen 🇿🇦 892 55 12ms 21 Jun 2023 471st Maznek 892 55 10ms 6 Jul 2023 471st MeWhenI 🇻🇦 892 55 11ms 21 Aug 2023 471st Argeento 🇵🇱 892 55 12ms 25 Aug 2023 471st itserasmus 892 55 11ms 25 Jan 2024 471st emgordon154 892 55 13ms 13 Jun 2024 471st fuzzylojik-golf 🇺🇸 892 55 12ms 6 May 2025 471st acollett89 892 55 11ms 21 Jul 2025 471st nathanadams 🇳🇿 892 55 11ms 6 Oct 2025 471st tigerdan2 🇩🇪 892 55 10ms 25 Oct 2025 471st biocommando 🇫🇮 892 55 13ms 27 Oct 2025 471st attila8192 892 55 43ms 6 Feb 2026 471st Lv0Sys 🇵🇱 892 55 13ms 26 days ago 497th dokutan 892 57 402ms 14 Feb 2026 497th plcc0 892 57 435ms 8 hours ago 499th Shanethegamer 🇺🇸 891 46 57ms 19 Nov 2022 499th GrayJoKing 🇦🇺 891 46 58ms 19 Nov 2022 499th JayXon 🇺🇸 891 46 59ms 19 Nov 2022 499th Steffan153 🇫🇮 891 46 100ms 19 Nov 2022 499th sisyphus-ppcg 🇦🇺 891 46 55ms 20 Nov 2022 499th MeWhenI 🇻🇦 891 46 58ms 20 Nov 2022 499th primo-ppcg 🇹🇭 891 46 58ms 20 Nov 2022 499th nwellnhof 🇩🇪 891 46 57ms 20 Nov 2022 499th janlelis 891 46 56ms 29 Nov 2022 499th stefangimmillaro 891 46 54ms 4 Dec 2022 499th prplz 🇦🇺 891 46 65ms 17 Jan 2023 499th ovs-code 🇩🇪 891 46 58ms 9 May 2023 499th DialFrost 🇸🇬 891 46 57ms 3 Jun 2024 499th mrondon8 891 46 105ms 2 Dec 2024 499th sean-niemann 🇺🇸 891 46 109ms 5 Feb 2025 499th pardouin 🇫🇷 891 46 58ms 10 Apr 2025 499th blaztoma 🇱🇹 891 46 58ms 13 Oct 2025 516th clockworknazo 891 55 32ms 2 Dec 2022 516th primo-ppcg 🇹🇭 891 55 23ms 2 Dec 2022 516th xsot 🇸🇬 891 55 29ms 1 May 2025 519th GolfingSuccess 🇬🇷 891 72 24ms 22 Feb 2026 519th GrayJoKing 🇦🇺 891 72 39ms 22 Feb 2026 519th frankgraziano 891 72 42ms 23 Feb 2026 519th edsrzf 🇳🇿 891 72 35ms 26 days ago 519th DialFrost 🇸🇬 891 72 36ms 25 days ago 519th Steffan153 🇫🇮 891 72 25ms 25 days ago 519th emgordon154 891 72 24ms 22 days ago 519th snoozingnewt 🇨🇦 891 72 24ms 19 days ago 527th DialFrost 🇸🇬 891 73 8ms 10 Mar 2025 528th revlayle 🇺🇸 891 84 385ms 22 Nov 2022 528th Betuaredead 891 84 383ms 7 Jan 2023 528th arctouch-cristiannevianna 891 84 395ms 9 Jun 2023 528th aliakseikalosha 891 84 375ms 2 Aug 2023 528th rifatx 891 84 381ms 22 Jul 2024 528th mrondon8 891 84 365ms 2 Dec 2024 528th annaproxy 891 84 413ms 11 Apr 2025 528th Re-Adventures 🇮🇳 891 84 421ms 15 Apr 2025 528th janbehrens 🇩🇪 891 84 429ms 17 Apr 2025 537th kg583 🇺🇸 890 86 57ms 13 Feb 2025 538th sisyphus-ppcg 🇦🇺 888 60 12ms 20 Nov 2022 539th Shanethegamer 🇺🇸 888 69 141ms 19 Nov 2022 539th Ripick 888 69 139ms 24 Jan 2023 539th MeWhenI 🇻🇦 888 69 156ms 1 Jun 2023 539th sean-niemann 🇺🇸 888 69 128ms 5 Feb 2025 543rd primo-ppcg 🇹🇭 888 72 143ms 20 Nov 2022 544th prplz 🇦🇺 888 83 134ms 3 Jan 2023 545th KasperKivimaeki 🇫🇮 888 89 378ms 30 Nov 2025 546th inventshah 888 90 63ms 25 Nov 2022 546th tailorspy 888 90 58ms 27 Oct 2024 548th Lydxn 🇨🇦 887 110 26ms 22 Jan 2023 548th m-tkach 🇺🇦 887 110 28ms 21 Apr 2023 550th UnderKoen 🇳🇱 886 100 300ms 20 Apr 2023 551st ovs-code 🇩🇪 885 86 476ms 12 May 2024 551st Steffan153 🇫🇮 885 86 527ms 21 Jul 2024 551st DialFrost 🇸🇬 885 86 483ms 23 Jul 2024 554th primo-ppcg 🇹🇭 885 113 287ms 20 Nov 2022 554th emplv 🇱🇻 885 113 303ms 21 Nov 2022 554th sean-niemann 🇺🇸 885 113 296ms 27 Jun 2023 554th Yewzir 🇧🇪 885 113 300ms 25 Oct 2023 554th kkoenig 885 113 282ms 4 Jan 2024 554th CaedenHarper 🇨🇦 885 113 289ms 12 Dec 2024 554th 0xjac 🇨🇭 885 113 288ms 17 Jun 2025 First Prev 481–560 of 2,740 Next Last