The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Leap Years in C++ 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 1st Lydxn 🇨🇦 1,000 75 61ms 9 Feb 2022 1st JayXon 🇺🇸 1,000 75 56ms 9 Feb 2022 3rd sean-niemann 🇺🇸 987 76 56ms 2 Jan 2022 3rd nwellnhof 🇩🇪 987 76 61ms 3 Jan 2022 3rd Irratix 🇳🇱 987 76 53ms 3 Jan 2022 3rd primo-ppcg 🇹🇭 987 76 59ms 18 Jan 2022 3rd voytxt 🇨🇿 987 76 58ms 10 Apr 2022 3rd jared-hughes 987 76 54ms 20 Jul 2022 3rd MeWhenI 🇻🇦 987 76 54ms 6 Sep 2022 3rd DialFrost 🇸🇬 987 76 58ms 30 Jan 2023 3rd Steffan153 🇫🇮 987 76 60ms 7 Feb 2023 3rd xsot 🇸🇬 987 76 62ms 21 May 2023 3rd GrayJoKing 🇦🇺 987 76 59ms 29 Feb 2024 3rd dokutan 987 76 57ms 25 Sep 2024 3rd snyderek 🇺🇸 987 76 61ms 3 Oct 2024 3rd fuzzylojik-golf 🇺🇸 987 76 62ms 28 Jun 2025 3rd Yax42 🇫🇷 987 76 58ms 4 Oct 2025 3rd Babafaba 987 76 55ms 15 Oct 2025 3rd KasperKivimaeki 🇫🇮 987 76 57ms 15 Oct 2025 3rd inventshah 987 76 58ms 25 Oct 2025 3rd 09cf 987 76 57ms 25 Nov 2025 22nd janbehrens 🇩🇪 974 77 58ms 8 Jan 2022 22nd solmyr2000 974 77 58ms 21 Jun 2022 22nd annaproxy 974 77 60ms 7 Jan 2023 22nd Alex-x90 🇺🇸 974 77 61ms 19 Feb 2023 22nd roupiq 🇵🇱 974 77 59ms 17 Nov 2023 22nd ovs-code 🇩🇪 974 77 55ms 3 Jun 2024 22nd tailorspy 974 77 60ms 23 Sep 2024 22nd luuumine 🇫🇷 974 77 69ms 16 Nov 2025 30th m-tkach 🇺🇦 962 78 56ms 24 Oct 2022 30th NDR0216 🇹🇼 962 78 62ms 9 May 2024 30th yeminghan2021 962 78 65ms 2 Feb 2025 30th qwertyuiop3 🇷🇺 962 78 59ms 2 Jun 2025 30th emgordon154 962 78 60ms 7 Feb 2026 35th Shanethegamer 🇺🇸 949 79 59ms 12 Jan 2022 35th Yewzir 🇧🇪 949 79 57ms 9 Dec 2023 35th oceko 949 79 58ms 19 Feb 2024 35th CaedenHarper 🇨🇦 949 79 62ms 1 Feb 2025 35th yanjs 949 79 480ms 10 Jul 2025 35th AutumnWind75 949 79 446ms 10 Dec 2025 35th bac0id 949 79 110ms 27 Jan 2026 42nd YoranDS 938 80 64ms 29 May 2023 42nd Walter225 938 80 87ms 10 Jul 2023 42nd Mandrzejy 🇵🇱 938 80 57ms 22 Feb 2024 42nd keelimeguy 🇺🇸 938 80 60ms 16 May 2025 42nd GolfingSuccess 🇬🇷 938 80 58ms 2 Sep 2025 42nd Andrey2001 938 80 60ms 25 Nov 2025 48th Re-Adventures 🇮🇳 926 81 62ms 2 Jan 2022 48th Betuaredead 926 81 59ms 4 Jan 2023 48th aksyristos 926 81 56ms 30 Jan 2023 48th CatsAreFluffy 926 81 59ms 19 Feb 2023 48th namcartoon06 926 81 59ms 30 Jun 2023 48th Herbert00709 🇵🇱 926 81 62ms 17 Nov 2023 48th HumanoidCPU 926 81 61ms 19 Feb 2024 55th astdefu 915 82 57ms 8 Dec 2022 56th trist224 🇫🇷 904 83 449ms 14 Dec 2022 56th cy1366371760 904 83 58ms 3 Jul 2025 56th YellowDudeIsMe 904 83 454ms 22 mins ago 59th msbranicky 893 84 55ms 20 Aug 2023 59th timhaj 🇸🇮 893 84 59ms 12 Sep 2025 61st pkhrag 882 85 62ms 4 Jan 2022 62nd snoozingnewt 🇨🇦 862 87 442ms 6 Oct 2025 63rd dteague3989 852 88 61ms 3 Aug 2023 64th m93mark 843 89 56ms 2 Jan 2022 64th GitNadirHub 843 89 61ms 28 May 2025 64th matejmatik123 🇸🇰 843 89 1,366ms 26 Sep 2025 67th alexalkis 833 90 59ms 2 Jan 2022 67th pandaninjas 833 90 1,379ms 9 Aug 2023 67th roguh 🇬🇹 833 90 60ms 14 Jan 2024 67th piano-miles 833 90 1,386ms 6 Sep 2024 67th gjoacorp 🇬🇧 833 90 59ms 3 Aug 2025 72nd BpbjsGreen 🇨🇳 824 91 59ms 7 Jul 2024 72nd elijahcroft 824 91 1,443ms 30 Apr 2025 74th hacker112 🇸🇪 815 92 1,390ms 22 Jun 2024 75th retrohun 806 93 62ms 27 Dec 2022 75th BlueSky555 806 93 58ms 9 Aug 2024 77th ibrahimhanifceker 798 94 66ms 30 Jan 2025 78th FrederikHutfless 🇩🇪 789 95 1,428ms 12 Jan 2023 78th 1231234md5 🇨🇳 789 95 62ms 11 Dec 2023 78th cubeBullet 789 95 1,331ms 3 Dec 2024 1–80 of 121 Next Last