The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 241st primo-ppcg 🇹🇭 939 49 1,278ms 11 May 2020 241st lynn 939 49 1,307ms 27 May 2021 241st JayXon 🇺🇸 939 49 1,257ms 23 Aug 2021 241st Lydxn 🇨🇦 939 49 1,292ms 23 Aug 2021 241st Steffan153 🇫🇮 939 49 1,241ms 4 days ago 246th primo-ppcg 🇹🇭 938 29 32ms 1 Apr 2019 247th Lydxn 🇨🇦 938 45 74ms 21 Mar 2023 247th Steffan153 🇫🇮 938 45 79ms 21 Mar 2023 247th JayXon 🇺🇸 938 45 74ms 21 Mar 2023 247th GrayJoKing 🇦🇺 938 45 72ms 21 Mar 2023 247th sean-niemann 🇺🇸 938 45 82ms 18 Apr 2025 252nd masterada 938 85 296ms 26 Mar 2021 252nd Lydxn 🇨🇦 938 85 273ms 10 Feb 2022 252nd JayXon 🇺🇸 938 85 286ms 15 Feb 2026 255th primo-ppcg 🇹🇭 937 50 115ms 1 Apr 2019 255th jslip 937 50 114ms 2 Apr 2019 255th SirHaswell 937 50 120ms 13 Jun 2019 255th Attero 🇸🇪 937 50 116ms 31 Mar 2020 255th SirBogman 🇺🇸 937 50 122ms 14 Jun 2020 255th aionescu 937 50 115ms 15 Aug 2020 255th GrayJoKing 🇦🇺 937 50 116ms 6 Dec 2020 255th sisyphus-ppcg 🇦🇺 937 50 120ms 20 Mar 2021 255th Shanethegamer 🇺🇸 937 50 120ms 30 Jun 2021 255th laikoni 937 50 111ms 27 Aug 2021 255th Irratix 🇳🇱 937 50 113ms 25 Sep 2021 255th annaproxy 937 50 124ms 7 Jan 2022 255th janbehrens 🇩🇪 937 50 112ms 20 Jul 2022 255th Steffan153 🇫🇮 937 50 120ms 8 Oct 2022 255th alomiF 937 50 120ms 1 Sep 2023 255th jared-hughes 937 50 121ms 7 Jul 2024 255th sean-niemann 🇺🇸 937 50 120ms 7 Jan 2025 255th DialFrost 🇸🇬 937 50 113ms 14 Feb 2025 255th iczelia 🇩🇪 937 50 115ms 16 Oct 2025 255th edsrzf 🇳🇿 937 50 123ms 21 Dec 2025 275th sean-niemann 🇺🇸 936 76 56ms 2 Jan 2022 275th nwellnhof 🇩🇪 936 76 61ms 3 Jan 2022 275th Irratix 🇳🇱 936 76 53ms 3 Jan 2022 275th primo-ppcg 🇹🇭 936 76 59ms 18 Jan 2022 275th voytxt 🇨🇿 936 76 58ms 10 Apr 2022 275th jared-hughes 936 76 54ms 20 Jul 2022 275th MeWhenI 🇻🇦 936 76 54ms 6 Sep 2022 275th DialFrost 🇸🇬 936 76 58ms 30 Jan 2023 275th Steffan153 🇫🇮 936 76 60ms 7 Feb 2023 275th xsot 🇸🇬 936 76 62ms 21 May 2023 275th GrayJoKing 🇦🇺 936 76 59ms 29 Feb 2024 275th dokutan 936 76 57ms 25 Sep 2024 275th snyderek 🇺🇸 936 76 61ms 3 Oct 2024 275th fuzzylojik-golf 🇺🇸 936 76 62ms 28 Jun 2025 275th Yax42 🇫🇷 936 76 58ms 4 Oct 2025 275th Babafaba 936 76 55ms 15 Oct 2025 275th KasperKivimaeki 🇫🇮 936 76 57ms 15 Oct 2025 275th inventshah 936 76 58ms 25 Oct 2025 275th 09cf 936 76 57ms 25 Nov 2025 294th primo-ppcg 🇹🇭 935 36 327ms 12 Oct 2020 294th HPWiz 🇳🇿 935 36 431ms 17 Nov 2020 294th antimon2 🇯🇵 935 36 379ms 25 Jan 2021 294th ovs-code 🇩🇪 935 36 412ms 24 Oct 2023 298th pardouin 🇫🇷 935 43 157ms 5 Aug 2024 298th Lydxn 🇨🇦 935 43 138ms 6 Aug 2024 298th JayXon 🇺🇸 935 43 137ms 9 Aug 2024 298th lukegustafson 🇺🇸 935 43 125ms 4 days ago 302nd sean-niemann 🇺🇸 935 47 2ms 9 Sep 2022 302nd Lydxn 🇨🇦 935 47 2ms 9 Sep 2022 302nd JayXon 🇺🇸 935 47 2ms 10 Sep 2022 302nd GrayJoKing 🇦🇺 935 47 2ms 10 Sep 2022 302nd MeWhenI 🇻🇦 935 47 2ms 10 Oct 2022 302nd Steffan153 🇫🇮 935 47 2ms 9 Feb 2023 302nd DialFrost 🇸🇬 935 47 2ms 8 Nov 2023 302nd dokutan 935 47 2ms 25 Sep 2024 310th JayXon 🇺🇸 935 56 1ms 9 Feb 2022 310th HPWiz 🇳🇿 935 56 581ms 24 Nov 2022 310th rhdqor213 935 56 410ms 2 Aug 2024 310th KasperKivimaeki 🇫🇮 935 56 574ms 17 Dec 2024 310th DialFrost 🇸🇬 935 56 564ms 17 Dec 2024 310th sean-niemann 🇺🇸 935 56 395ms 4 Feb 2026 310th Steffan153 🇫🇮 935 56 697ms 21 days ago 317th chloeching-amino 934 42 11ms 24 May 2020 317th janlelis 934 42 10ms 10 Feb 2021 317th KatieLG 🇬🇧 934 42 9ms 15 Apr 2021 317th sultan 934 42 10ms 2 May 2021 First Prev 241–320 of 4,867 Next Last