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?
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 Steffan153 🇫🇮 877 130 4ms 19 Jul 2023 562nd MeWhenI 🇻🇦 877 188 1,434ms 28 Mar 2025 562nd emgordon154 877 188 1,447ms 8 Jul 2025 564th JayXon 🇺🇸 877 207 1,660ms 15 Sep 2025 565th JayXon 🇺🇸 876 108 131ms 28 Nov 2021 565th Shanethegamer 🇺🇸 876 108 3ms 12 Sep 2022 565th exodrifter 🇺🇸 876 108 150ms 25 Oct 2022 565th tobeannouncd 876 108 143ms 1 Jan 2024 565th albanian-laundromat 876 108 3ms 27 Aug 2025 570th prplz 🇦🇺 876 110 2ms 18 Apr 2022 570th Shanethegamer 🇺🇸 876 110 1,039ms 15 Oct 2022 572nd Steffan153 🇫🇮 875 106 1,316ms 3 Jan 2023 573rd Steffan153 🇫🇮 875 115 108ms 22 Feb 2026 574th Steffan153 🇫🇮 875 121 4ms 4 days ago 574th MeWhenI 🇻🇦 875 121 4ms 3 days ago 576th primo-ppcg 🇹🇭 875 167 78ms 10 May 2023 577th alemelis 874 78 331ms 20 Sep 2024 578th MeWhenI 🇻🇦 874 88 9ms 22 Nov 2021 578th Re-Adventures 🇮🇳 874 88 10ms 22 Nov 2021 578th NewDefectus 🇮🇱 874 88 10ms 22 Nov 2021 578th KrausRaus 🇺🇸 874 88 9ms 23 Nov 2021 578th stefangimmillaro 874 88 9ms 23 Nov 2021 578th GrayJoKing 🇦🇺 874 88 11ms 23 Nov 2021 578th Natanaelel 🇸🇪 874 88 9ms 23 Nov 2021 578th m-tkach 🇺🇦 874 88 11ms 23 Nov 2021 578th alasdair-greenland 874 88 9ms 23 Nov 2021 578th wansacis 🇩🇪 874 88 10ms 25 Nov 2021 578th ArmaanAS 874 88 11ms 27 Nov 2021 578th MathisBullinger 874 88 10ms 28 Nov 2021 578th c0d3-4-F00d 🇩🇪 874 88 10ms 30 Nov 2021 578th two-bad 🇬🇧 874 88 10ms 4 Dec 2021 578th Attero 🇸🇪 874 88 10ms 21 Dec 2021 578th fourth-bit 874 88 11ms 20 Jan 2022 578th voytxt 🇨🇿 874 88 12ms 11 Feb 2022 578th primo-ppcg 🇹🇭 874 88 11ms 21 Mar 2022 578th vincens2005 🇺🇸 874 88 10ms 8 Apr 2022 578th JavaScriptizer101 874 88 10ms 19 May 2022 578th stefangabos 🇷🇴 874 88 12ms 9 Sep 2022 578th raphaelimahorn 874 88 10ms 3 Oct 2022 578th moikaturns 🇬🇧 874 88 9ms 18 Oct 2022 578th Kesefon 874 88 11ms 24 Nov 2022 578th randolchance 874 88 10ms 21 Dec 2022 578th lordsnek 874 88 11ms 29 Dec 2022 578th SirFireball3521 874 88 10ms 3 Feb 2023 578th jmerle 🇳🇱 874 88 10ms 14 Feb 2023 578th AlephSquirrel 874 88 10ms 15 Feb 2023 578th Yewzir 🇧🇪 874 88 10ms 16 Apr 2023 578th zakariamouhid 874 88 10ms 20 May 2023 578th Argeento 🇵🇱 874 88 10ms 25 Aug 2023 578th jared-hughes 874 88 9ms 11 Sep 2023 578th bsara 874 88 10ms 21 Oct 2023 578th fuzzylojik-golf 🇺🇸 874 88 12ms 9 Dec 2023 578th olleicua 🇺🇸 874 88 10ms 13 Jan 2024 578th NickTheEASDude 🇺🇸 874 88 10ms 18 Jan 2024 578th Jacob385 874 88 11ms 21 Mar 2024 578th tayloia 🇬🇧 874 88 10ms 19 Jun 2024 578th alexsave 874 88 13ms 10 Sep 2024 578th xyangst 874 88 12ms 23 Sep 2024 578th Cavan-P 874 88 10ms 10 Nov 2024 578th wh3n3v3r 🇨🇿 874 88 10ms 18 Nov 2024 578th targrik 874 88 10ms 5 Feb 2025 578th BalaM314 874 88 11ms 8 Feb 2025 578th Ralac07 🇦🇺 874 88 14ms 18 Apr 2025 578th BREMAUCY 🇫🇷 874 88 10ms 29 Jun 2025 578th Protothor 874 88 10ms 2 Jul 2025 578th albanian-laundromat 874 88 10ms 1 Sep 2025 578th CaedenHarper 🇨🇦 874 88 10ms 3 Oct 2025 578th KatieLG 🇬🇧 874 88 13ms 5 Oct 2025 578th snoozingnewt 🇨🇦 874 88 9ms 16 Oct 2025 578th Ow0cast 874 88 10ms 17 Oct 2025 578th luuumine 🇫🇷 874 88 10ms 3 Nov 2025 578th JOrE20 874 88 20ms 3 Nov 2025 578th amazingalek 🇳🇴 874 88 10ms 20 Dec 2025 578th KingSkyrock 🇺🇸 874 88 13ms 26 days ago 635th andersk 🇺🇸 873 138 147ms 7 Nov 2022 636th primo-ppcg 🇹🇭 871 73 89ms 13 May 2022 637th prplz 🇦🇺 871 75 264ms 13 Dec 2021 637th lynn 871 75 295ms 16 Jul 2023 637th IISResetMe 871 75 276ms 9 Mar 2024 637th Jaykul 871 75 269ms 12 May 2024 First Prev 561–640 of 3,457 Next Last