The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar 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 960th emgordon154 885 55 3ms 3 Nov 2024 962nd HCRitter 🇩🇪 885 79 279ms 1 Nov 2023 962nd janbehrens 🇩🇪 885 79 278ms 28 Nov 2023 962nd Yewzir 🇧🇪 885 79 282ms 9 Apr 2024 962nd 5quiwyrm 885 79 269ms 4 Dec 2024 966th SirBogman 🇺🇸 885 90 1ms 29 Oct 2022 966th dokutan 885 90 2ms 16 Jul 2025 968th dokutan 884 85 1,063ms 30 Aug 2025 969th emgordon154 884 113 14ms 11 Dec 2024 970th JayXon 🇺🇸 884 208 1,660ms 15 Sep 2025 971st frankgraziano 884 245 17ms 20 Aug 2025 972nd prplz 🇦🇺 883 110 2ms 18 Apr 2022 973rd ovs-code 🇩🇪 883 120 474ms 4 Mar 2022 974th albanian-laundromat 882 88 504ms 7 Oct 2025 975th ovs-code 🇩🇪 882 109 69ms 12 Sep 2024 976th emgordon154 882 119 120ms 28 Nov 2025 977th MeWhenI 🇻🇦 881 131 3ms 15 Jul 2023 978th MeWhenI 🇻🇦 880 88 11ms 22 Nov 2021 978th Re-Adventures 🇮🇳 880 88 11ms 22 Nov 2021 978th NewDefectus 🇮🇱 880 88 13ms 22 Nov 2021 978th KrausRaus 🇺🇸 880 88 12ms 23 Nov 2021 978th stefangimmillaro 880 88 13ms 23 Nov 2021 978th GrayJoKing 🇦🇺 880 88 11ms 23 Nov 2021 978th Natanaelel 🇸🇪 880 88 12ms 23 Nov 2021 978th m-tkach 🇺🇦 880 88 11ms 23 Nov 2021 978th alasdair-greenland 880 88 12ms 23 Nov 2021 978th wansacis 🇩🇪 880 88 14ms 25 Nov 2021 978th ArmaanAS 880 88 11ms 27 Nov 2021 978th MathisBullinger 880 88 11ms 28 Nov 2021 978th c0d3-4-F00d 🇩🇪 880 88 10ms 30 Nov 2021 978th two-bad 🇬🇧 880 88 11ms 4 Dec 2021 978th Attero 🇸🇪 880 88 10ms 21 Dec 2021 978th fourth-bit 880 88 10ms 20 Jan 2022 978th voytxt 🇨🇿 880 88 11ms 11 Feb 2022 978th primo-ppcg 🇹🇭 880 88 11ms 21 Mar 2022 978th vincens2005 🇺🇸 880 88 14ms 8 Apr 2022 978th JavaScriptizer101 880 88 13ms 19 May 2022 978th stefangabos 🇷🇴 880 88 13ms 9 Sep 2022 978th raphaelimahorn 880 88 11ms 3 Oct 2022 978th moikaturns 🇬🇧 880 88 11ms 18 Oct 2022 978th Kesefon 880 88 12ms 24 Nov 2022 978th randolchance 880 88 11ms 21 Dec 2022 978th lordsnek 880 88 12ms 29 Dec 2022 978th DialFrost 🇸🇬 880 88 11ms 27 Jan 2023 978th SirFireball3521 880 88 11ms 3 Feb 2023 978th jmerle 🇳🇱 880 88 13ms 14 Feb 2023 978th AlephSquirrel 880 88 12ms 15 Feb 2023 978th Yewzir 🇧🇪 880 88 12ms 16 Apr 2023 978th zakariamouhid 880 88 11ms 20 May 2023 978th Argeento 🇵🇱 880 88 12ms 25 Aug 2023 978th jared-hughes 880 88 15ms 11 Sep 2023 978th bsara 880 88 11ms 21 Oct 2023 978th fuzzylojik-golf 🇺🇸 880 88 12ms 9 Dec 2023 978th olleicua 🇺🇸 880 88 11ms 13 Jan 2024 978th NickTheEASDude 🇺🇸 880 88 11ms 18 Jan 2024 978th SadiinsoSnowfall 🇫🇷 880 88 11ms 16 Feb 2024 978th HumanoidCPU 880 88 12ms 16 Mar 2024 978th Jacob385 880 88 12ms 21 Mar 2024 978th tayloia 🇬🇧 880 88 12ms 19 Jun 2024 978th alexsave 880 88 11ms 10 Sep 2024 978th xyangst 880 88 10ms 23 Sep 2024 978th dokutan 880 88 10ms 28 Sep 2024 978th Cavan-P 880 88 11ms 10 Nov 2024 978th wh3n3v3r 🇨🇿 880 88 9ms 18 Nov 2024 978th targrik 880 88 10ms 5 Feb 2025 978th BalaM314 880 88 15ms 8 Feb 2025 978th Ralac07 🇦🇺 880 88 11ms 18 Apr 2025 978th BREMAUCY 🇫🇷 880 88 10ms 29 Jun 2025 978th Protothor 880 88 12ms 2 Jul 2025 978th albanian-laundromat 880 88 11ms 1 Sep 2025 978th CaedenHarper 🇨🇦 880 88 11ms 3 Oct 2025 978th snoozingnewt 🇨🇦 880 88 12ms 16 Oct 2025 978th Ow0cast 880 88 11ms 17 Oct 2025 978th luuumine 🇫🇷 880 88 10ms 3 Nov 2025 978th JOrE20 880 88 9ms 3 Nov 2025 978th amazingalek 🇳🇴 880 88 10ms 20 Dec 2025 978th egertaia 880 88 12ms 12 Jan 2026 978th KingSkyrock 🇺🇸 880 88 11ms 25 Feb 2026 1,039th Ailko 🇧🇪 880 93 50ms 5 May 2022 1,039th P-Quentin 🇫🇷 880 93 42ms 3 Aug 2022 First Prev 961–1,040 of 3,484 Next Last