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?
Leap Years 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 240th Steffan153 🇫🇮 939 45 2ms 5 hours ago 242nd primo-ppcg 🇹🇭 939 49 1,278ms 11 May 2020 242nd lynn 939 49 1,307ms 27 May 2021 242nd JayXon 🇺🇸 939 49 1,257ms 23 Aug 2021 242nd Lydxn 🇨🇦 939 49 1,292ms 23 Aug 2021 242nd Steffan153 🇫🇮 939 49 1,241ms 5 hours ago 247th primo-ppcg 🇹🇭 938 29 32ms 1 Apr 2019 248th Lydxn 🇨🇦 938 45 74ms 21 Mar 2023 248th Steffan153 🇫🇮 938 45 79ms 21 Mar 2023 248th JayXon 🇺🇸 938 45 74ms 21 Mar 2023 248th GrayJoKing 🇦🇺 938 45 72ms 21 Mar 2023 248th sean-niemann 🇺🇸 938 45 82ms 18 Apr 2025 253rd masterada 938 85 296ms 26 Mar 2021 253rd Lydxn 🇨🇦 938 85 273ms 10 Feb 2022 253rd JayXon 🇺🇸 938 85 286ms 15 Feb 2026 256th primo-ppcg 🇹🇭 937 50 115ms 1 Apr 2019 256th jslip 937 50 114ms 2 Apr 2019 256th SirHaswell 937 50 120ms 13 Jun 2019 256th Attero 🇸🇪 937 50 116ms 31 Mar 2020 256th SirBogman 🇺🇸 937 50 122ms 14 Jun 2020 256th aionescu 937 50 115ms 15 Aug 2020 256th GrayJoKing 🇦🇺 937 50 116ms 6 Dec 2020 256th sisyphus-ppcg 🇦🇺 937 50 120ms 20 Mar 2021 256th Shanethegamer 🇺🇸 937 50 120ms 30 Jun 2021 256th laikoni 937 50 111ms 27 Aug 2021 256th Irratix 🇳🇱 937 50 113ms 25 Sep 2021 256th annaproxy 937 50 124ms 7 Jan 2022 256th janbehrens 🇩🇪 937 50 112ms 20 Jul 2022 256th Steffan153 🇫🇮 937 50 120ms 8 Oct 2022 256th alomiF 937 50 120ms 1 Sep 2023 256th jared-hughes 937 50 121ms 7 Jul 2024 256th sean-niemann 🇺🇸 937 50 120ms 7 Jan 2025 256th DialFrost 🇸🇬 937 50 113ms 14 Feb 2025 256th iczelia 🇩🇪 937 50 115ms 16 Oct 2025 256th edsrzf 🇳🇿 937 50 123ms 21 Dec 2025 276th sean-niemann 🇺🇸 936 76 54ms 2 Jan 2022 276th nwellnhof 🇩🇪 936 76 55ms 3 Jan 2022 276th Irratix 🇳🇱 936 76 58ms 3 Jan 2022 276th primo-ppcg 🇹🇭 936 76 53ms 18 Jan 2022 276th voytxt 🇨🇿 936 76 59ms 10 Apr 2022 276th jared-hughes 936 76 60ms 20 Jul 2022 276th MeWhenI 🇻🇦 936 76 58ms 6 Sep 2022 276th DialFrost 🇸🇬 936 76 62ms 30 Jan 2023 276th Steffan153 🇫🇮 936 76 60ms 7 Feb 2023 276th xsot 🇸🇬 936 76 60ms 21 May 2023 276th GrayJoKing 🇦🇺 936 76 58ms 29 Feb 2024 276th dokutan 936 76 59ms 25 Sep 2024 276th snyderek 🇺🇸 936 76 59ms 3 Oct 2024 276th fuzzylojik-golf 🇺🇸 936 76 59ms 28 Jun 2025 276th Yax42 🇫🇷 936 76 59ms 4 Oct 2025 276th Babafaba 936 76 59ms 15 Oct 2025 276th KasperKivimaeki 🇫🇮 936 76 61ms 15 Oct 2025 276th inventshah 936 76 59ms 25 Oct 2025 276th 09cf 936 76 58ms 25 Nov 2025 295th primo-ppcg 🇹🇭 935 36 327ms 12 Oct 2020 295th HPWiz 🇳🇿 935 36 431ms 17 Nov 2020 295th antimon2 🇯🇵 935 36 379ms 25 Jan 2021 295th ovs-code 🇩🇪 935 36 412ms 24 Oct 2023 299th pardouin 🇫🇷 935 43 157ms 5 Aug 2024 299th Lydxn 🇨🇦 935 43 138ms 6 Aug 2024 299th JayXon 🇺🇸 935 43 137ms 9 Aug 2024 299th lukegustafson 🇺🇸 935 43 125ms 18 hours ago 303rd sean-niemann 🇺🇸 935 47 2ms 9 Sep 2022 303rd Lydxn 🇨🇦 935 47 2ms 9 Sep 2022 303rd JayXon 🇺🇸 935 47 2ms 10 Sep 2022 303rd GrayJoKing 🇦🇺 935 47 2ms 10 Sep 2022 303rd MeWhenI 🇻🇦 935 47 2ms 10 Oct 2022 303rd Steffan153 🇫🇮 935 47 2ms 9 Feb 2023 303rd DialFrost 🇸🇬 935 47 2ms 8 Nov 2023 303rd dokutan 935 47 2ms 25 Sep 2024 311th JayXon 🇺🇸 935 56 1ms 9 Feb 2022 311th HPWiz 🇳🇿 935 56 581ms 24 Nov 2022 311th rhdqor213 935 56 410ms 2 Aug 2024 311th KasperKivimaeki 🇫🇮 935 56 574ms 17 Dec 2024 311th DialFrost 🇸🇬 935 56 564ms 17 Dec 2024 311th sean-niemann 🇺🇸 935 56 395ms 4 Feb 2026 311th Steffan153 🇫🇮 935 56 697ms 18 days ago 318th chloeching-amino 934 42 9ms 24 May 2020 318th janlelis 934 42 8ms 10 Feb 2021 318th KatieLG 🇬🇧 934 42 10ms 15 Apr 2021 First Prev 241–320 of 4,863 Next Last