The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 34 hours. 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 559th sean-niemann 🇺🇸 911 53 4ms 25 Mar 2025 562nd dokutan 910 37 337ms 18 Mar 2025 563rd xsot 🇸🇬 910 40 722ms 22 Feb 2026 564th sean-niemann 🇺🇸 909 55 7ms 23 Jun 2025 565th Lydxn 🇨🇦 909 56 9ms 15 Nov 2021 565th lynn 909 56 9ms 16 Nov 2021 565th GrayJoKing 🇦🇺 909 56 9ms 16 Nov 2021 565th JayXon 🇺🇸 909 56 10ms 19 Nov 2021 565th annaproxy 909 56 9ms 31 Dec 2021 565th IanUtley 909 56 9ms 19 Jun 2024 565th ovs-code 🇩🇪 909 56 10ms 29 Jun 2024 572nd sisyphus-ppcg 🇦🇺 908 34 1,255ms 26 Mar 2021 572nd dokutan 908 34 1,299ms 25 Sep 2024 574th MeWhenI 🇻🇦 908 45 1,033ms 12 Oct 2022 574th sean-niemann 🇺🇸 908 45 87ms 6 May 2024 576th primo-ppcg 🇹🇭 908 51 4ms 20 May 2023 577th janbehrens 🇩🇪 908 69 449ms 24 Mar 2022 577th voytxt 🇨🇿 908 69 440ms 7 Apr 2022 579th 2bular 907 30 32ms 7 Nov 2025 580th kg583 🇺🇸 907 44 387ms 15 Jan 2024 580th ovs-code 🇩🇪 907 44 423ms 16 Jan 2024 580th Steffan153 🇫🇮 907 44 425ms 16 Jan 2024 580th DialFrost 🇸🇬 907 44 405ms 16 Jan 2024 580th GrayJoKing 🇦🇺 907 44 410ms 18 Jan 2024 580th rucin93 🇵🇱 907 44 420ms 21 Jan 2024 580th pardouin 🇫🇷 907 44 384ms 23 Jun 2024 580th CornerMercury 🇬🇧 907 44 420ms 13 Oct 2025 588th Steffan153 🇫🇮 907 53 7ms 6 days ago 589th stefangimmillaro 906 88 291ms 4 Aug 2023 589th sean-niemann 🇺🇸 906 88 292ms 25 Mar 2025 591st Shanethegamer 🇺🇸 905 61 41ms 13 Feb 2025 591st edsrzf 🇳🇿 905 61 41ms 19 Aug 2025 591st Steffan153 🇫🇮 905 61 40ms 12 Feb 2026 594th canissimia 🇦🇶 905 179 1ms 11 Sep 2021 595th emplv 🇱🇻 904 49 5ms 15 Apr 2021 595th janbehrens 🇩🇪 904 49 4ms 22 May 2021 595th rucin93 🇵🇱 904 49 4ms 3 Dec 2021 595th GrayJoKing 🇦🇺 904 49 4ms 9 Feb 2022 595th voytxt 🇨🇿 904 49 5ms 16 May 2022 595th MeWhenI 🇻🇦 904 49 4ms 28 May 2023 595th stefangimmillaro 904 49 4ms 22 Aug 2023 595th Argeento 🇵🇱 904 49 4ms 25 Aug 2023 595th DialFrost 🇸🇬 904 49 5ms 8 Nov 2023 595th Shanethegamer 🇺🇸 904 49 5ms 9 Jan 2024 595th fuzzylojik-golf 🇺🇸 904 49 5ms 2 days ago 606th Attero 🇸🇪 903 58 1ms 12 Mar 2020 606th filharmonista 903 58 1ms 13 Mar 2020 606th cywong-amino 🇭🇰 903 58 1ms 30 May 2020 606th nwellnhof 🇩🇪 903 58 1ms 4 Oct 2020 606th primo-ppcg 🇹🇭 903 58 1ms 5 Oct 2020 606th Irratix 🇳🇱 903 58 2ms 9 Oct 2020 606th madex 🇩🇪 903 58 2ms 23 Mar 2021 606th NewDefectus 🇮🇱 903 58 2ms 27 May 2021 606th tsunderu 🇯🇵 903 58 1ms 2 Sep 2021 606th GrayJoKing 🇦🇺 903 58 1ms 9 Feb 2022 606th voytxt 🇨🇿 903 58 1ms 7 Apr 2022 606th emplv 🇱🇻 903 58 1ms 28 Apr 2022 606th prplz 🇦🇺 903 58 1ms 22 May 2022 606th jared-hughes 903 58 1ms 24 Jun 2022 606th MeWhenI 🇻🇦 903 58 1ms 6 Sep 2022 606th inventshah 903 58 1ms 26 Jan 2023 606th ovs-code 🇩🇪 903 58 1ms 5 Feb 2023 606th xsot 🇸🇬 903 58 1ms 19 Mar 2023 606th rucin93 🇵🇱 903 58 2ms 21 Jun 2023 606th stefangimmillaro 903 58 1ms 4 Aug 2023 606th ListeriaM 903 58 1ms 24 Aug 2023 606th JohandeRuiter 🇳🇱 903 58 1ms 25 Oct 2023 606th dokutan 903 58 2ms 25 Sep 2024 606th FlyingPenguin223 903 58 1ms 10 Feb 2025 606th kdx2a 903 58 1ms 11 Feb 2025 606th Mukundan314 903 58 1ms 26 Apr 2025 606th fuzzylojik-golf 🇺🇸 903 58 2ms 28 Jun 2025 606th Yax42 🇫🇷 903 58 2ms 9 Oct 2025 606th ApoChagi 903 58 1ms 14 Oct 2025 606th Babafaba 903 58 1ms 15 Oct 2025 606th 09cf 903 58 2ms 25 Nov 2025 637th tjtnorton 902 47 16ms 28 Mar 2019 637th daedals 902 47 19ms 21 Apr 2019 637th handisb 902 47 17ms 5 Sep 2019 637th andersk 🇺🇸 902 47 16ms 20 Mar 2020 First Prev 561–640 of 4,879 Next Last