The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar 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 561st frankgraziano 878 245 17ms 20 Aug 2025 562nd primo-ppcg 🇹🇭 877 46 50ms 9 Dec 2022 563rd inventshah 877 112 2,662ms 10 Nov 2024 564th btnlq 877 115 2ms 25 Dec 2022 565th Steffan153 🇫🇮 877 130 4ms 19 Jul 2023 566th primo-ppcg 🇹🇭 877 167 78ms 10 May 2023 567th MeWhenI 🇻🇦 877 188 1,425ms 28 Mar 2025 567th emgordon154 877 188 1,466ms 8 Jul 2025 569th JayXon 🇺🇸 877 207 1,660ms 15 Sep 2025 570th JayXon 🇺🇸 876 108 131ms 28 Nov 2021 570th Shanethegamer 🇺🇸 876 108 3ms 12 Sep 2022 570th exodrifter 🇺🇸 876 108 150ms 25 Oct 2022 570th tobeannouncd 876 108 143ms 1 Jan 2024 570th albanian-laundromat 876 108 3ms 27 Aug 2025 575th prplz 🇦🇺 876 110 2ms 18 Apr 2022 575th Shanethegamer 🇺🇸 876 110 113ms 15 Oct 2022 577th Steffan153 🇫🇮 875 106 1,316ms 3 Jan 2023 578th Steffan153 🇫🇮 875 115 108ms 22 Feb 2026 579th alemelis 874 78 331ms 20 Sep 2024 580th MeWhenI 🇻🇦 874 88 10ms 22 Nov 2021 580th Re-Adventures 🇮🇳 874 88 9ms 22 Nov 2021 580th NewDefectus 🇮🇱 874 88 11ms 22 Nov 2021 580th KrausRaus 🇺🇸 874 88 10ms 23 Nov 2021 580th stefangimmillaro 874 88 11ms 23 Nov 2021 580th GrayJoKing 🇦🇺 874 88 11ms 23 Nov 2021 580th Natanaelel 🇸🇪 874 88 9ms 23 Nov 2021 580th m-tkach 🇺🇦 874 88 10ms 23 Nov 2021 580th alasdair-greenland 874 88 11ms 23 Nov 2021 580th wansacis 🇩🇪 874 88 10ms 25 Nov 2021 580th ArmaanAS 874 88 11ms 27 Nov 2021 580th MathisBullinger 874 88 9ms 28 Nov 2021 580th c0d3-4-F00d 🇩🇪 874 88 10ms 30 Nov 2021 580th two-bad 🇬🇧 874 88 10ms 4 Dec 2021 580th Attero 🇸🇪 874 88 10ms 21 Dec 2021 580th fourth-bit 874 88 9ms 20 Jan 2022 580th voytxt 🇨🇿 874 88 11ms 11 Feb 2022 580th primo-ppcg 🇹🇭 874 88 10ms 21 Mar 2022 580th vincens2005 🇺🇸 874 88 11ms 8 Apr 2022 580th JavaScriptizer101 874 88 9ms 19 May 2022 580th stefangabos 🇷🇴 874 88 13ms 9 Sep 2022 580th raphaelimahorn 874 88 10ms 3 Oct 2022 580th moikaturns 🇬🇧 874 88 10ms 18 Oct 2022 580th Kesefon 874 88 10ms 24 Nov 2022 580th randolchance 874 88 10ms 21 Dec 2022 580th lordsnek 874 88 12ms 29 Dec 2022 580th SirFireball3521 874 88 10ms 3 Feb 2023 580th jmerle 🇳🇱 874 88 10ms 14 Feb 2023 580th AlephSquirrel 874 88 11ms 15 Feb 2023 580th Yewzir 🇧🇪 874 88 10ms 16 Apr 2023 580th zakariamouhid 874 88 10ms 20 May 2023 580th Argeento 🇵🇱 874 88 11ms 25 Aug 2023 580th jared-hughes 874 88 10ms 11 Sep 2023 580th bsara 874 88 11ms 21 Oct 2023 580th fuzzylojik-golf 🇺🇸 874 88 11ms 9 Dec 2023 580th olleicua 🇺🇸 874 88 11ms 13 Jan 2024 580th NickTheEASDude 🇺🇸 874 88 9ms 18 Jan 2024 580th Jacob385 874 88 9ms 21 Mar 2024 580th tayloia 🇬🇧 874 88 11ms 19 Jun 2024 580th alexsave 874 88 11ms 10 Sep 2024 580th xyangst 874 88 10ms 23 Sep 2024 580th Cavan-P 874 88 10ms 10 Nov 2024 580th wh3n3v3r 🇨🇿 874 88 9ms 18 Nov 2024 580th targrik 874 88 10ms 5 Feb 2025 580th BalaM314 874 88 11ms 8 Feb 2025 580th Ralac07 🇦🇺 874 88 10ms 18 Apr 2025 580th BREMAUCY 🇫🇷 874 88 10ms 29 Jun 2025 580th Protothor 874 88 11ms 2 Jul 2025 580th albanian-laundromat 874 88 10ms 1 Sep 2025 580th CaedenHarper 🇨🇦 874 88 9ms 3 Oct 2025 580th KatieLG 🇬🇧 874 88 11ms 5 Oct 2025 580th snoozingnewt 🇨🇦 874 88 10ms 16 Oct 2025 580th Ow0cast 874 88 11ms 17 Oct 2025 580th luuumine 🇫🇷 874 88 10ms 3 Nov 2025 580th JOrE20 874 88 9ms 3 Nov 2025 580th amazingalek 🇳🇴 874 88 10ms 20 Dec 2025 580th KingSkyrock 🇺🇸 874 88 11ms 25 Feb 2026 580th madeforlosers 874 88 10ms 6 hours ago 638th andersk 🇺🇸 873 138 144ms 7 Nov 2022 639th prplz 🇦🇺 872 75 264ms 13 Dec 2021 639th lynn 872 75 295ms 16 Jul 2023 First Prev 561–640 of 3,465 Next Last