The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 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 686th martion2007 910 90 10ms 15 Aug 2024 686th gallium-gonzollium 910 90 11ms 26 Aug 2024 686th alemelis 910 90 12ms 1 Oct 2024 686th rozium 910 90 12ms 11 Oct 2024 686th Artemis21 🇬🇧 910 90 12ms 21 Dec 2024 686th WCScrypto-official 910 90 11ms 22 Dec 2024 686th Alithinar 910 90 12ms 15 May 2025 686th LuisGoncalves05 🇵🇹 910 90 12ms 9 Jul 2025 686th ESOrSomething 910 90 40ms 26 Sep 2025 686th jacekwladzinski 910 90 12ms 2 Oct 2025 686th SectorCorruptor 910 90 11ms 10 Feb 2026 686th mailboxjpg 910 90 11ms 26 Feb 2026 733rd GrayJoKing 🇦🇺 910 112 2ms 16 Jul 2024 734th lynn 910 124 24ms 11 Jul 2023 734th Steffan153 🇫🇮 910 124 25ms 16 Jun 2024 736th Steffan153 🇫🇮 909 82 153ms 8 Aug 2024 736th sean-niemann 🇺🇸 909 82 138ms 8 Aug 2024 736th rucin93 🇵🇱 909 82 146ms 9 Aug 2024 739th btnlq 909 95 16ms 9 Dec 2021 740th Shanethegamer 🇺🇸 909 110 14ms 5 May 2024 741st GrayJoKing 🇦🇺 909 120 37ms 20 Jun 2022 741st 386asm 🇺🇸 909 120 39ms 27 Apr 2023 743rd ovs-code 🇩🇪 909 127 3ms 14 Jul 2023 743rd typeswitch-dev 🇵🇹 909 127 3ms 24 Jul 2023 745th byronknoll 🇺🇸 909 132 58ms 25 Jan 2024 746th GrayJoKing 🇦🇺 908 77 271ms 21 Nov 2021 747th MeWhenI 🇻🇦 908 89 11ms 3 Jul 2023 748th MeWhenI 🇻🇦 908 113 12ms 29 Mar 2024 749th SirBogman 🇺🇸 907 101 43ms 3 Jun 2025 750th Shanethegamer 🇺🇸 906 105 112ms 15 Oct 2022 750th sisyphus-ppcg 🇦🇺 906 105 136ms 19 Oct 2022 750th stefangimmillaro 906 105 121ms 19 Oct 2022 750th sean-niemann 🇺🇸 906 105 106ms 19 Mar 2025 754th frankgraziano 906 113 9ms 23 Feb 2026 754th edsrzf 🇳🇿 906 113 8ms 25 Feb 2026 754th Steffan153 🇫🇮 906 113 9ms 26 Feb 2026 754th emgordon154 906 113 10ms 27 days ago 754th GrayJoKing 🇦🇺 906 113 8ms 26 days ago 759th GrayJoKing 🇦🇺 905 106 3ms 12 Sep 2022 760th canissimia 🇦🇶 905 138 186ms 20 May 2023 761st Steffan153 🇫🇮 904 116 108ms 22 Feb 2026 762nd Frowny 902 51 36ms 22 Nov 2021 763rd Shanethegamer 🇺🇸 902 106 140ms 23 May 2023 763rd btnlq 902 106 131ms 15 Oct 2023 765th SirBogman 🇺🇸 902 121 40ms 19 Jun 2022 766th btnlq 902 128 3ms 15 Jul 2023 766th GrayJoKing 🇦🇺 902 128 3ms 25 Jul 2023 768th ovs-code 🇩🇪 902 133 433ms 28 Feb 2023 769th CaedenHarper 🇨🇦 902 138 453ms 3 Oct 2025 769th squid233 902 138 485ms 7 Nov 2025 771st jared-hughes 902 141 18ms 20 Dec 2024 772nd m-tkach 🇺🇦 902 164 80ms 25 Apr 2022 773rd emgordon154 901 145 4ms 15 Jan 2025 774th retrohun 900 72 249ms 6 Oct 2024 775th sean-niemann 🇺🇸 900 79 312ms 12 Mar 2025 776th didion0 🇺🇸 900 86 12ms 23 Nov 2021 776th MattShaile 900 86 11ms 20 Mar 2022 776th samthidny 900 86 11ms 20 Mar 2022 776th Irratix 🇳🇱 900 86 11ms 1 Apr 2022 776th Shanethegamer 🇺🇸 900 86 10ms 1 Apr 2022 776th 0x24a537r9 900 86 11ms 20 Aug 2022 776th DayDun 🇸🇪 900 86 11ms 17 Jan 2023 776th thisishowmymindworks 🇳🇴 900 86 12ms 8 Jun 2023 776th Maznek 900 86 12ms 1 Jul 2023 776th coreynash 900 86 11ms 15 Sep 2023 776th Davr1 🇨🇿 900 86 12ms 14 Oct 2023 776th byronknoll 🇺🇸 900 86 11ms 14 May 2024 776th 0scarB 900 86 14ms 14 Jun 2024 776th thadeucity 900 86 11ms 23 May 2025 790th PyPylia 🇦🇺 900 91 11ms 25 Nov 2021 790th EzraG101 900 91 11ms 26 Nov 2021 790th fynnkroeger 900 91 12ms 5 Dec 2021 790th olavaga 900 91 12ms 8 Dec 2021 790th petroselo 900 91 12ms 27 Dec 2021 790th Puperger 900 91 11ms 29 Dec 2021 790th raketexyz 900 91 11ms 29 Dec 2021 790th neburcraft 900 91 43ms 30 Dec 2021 790th amollberg 🇸🇪 900 91 12ms 25 Jan 2022 790th shibacho 🇯🇵 900 91 10ms 29 Jan 2022 790th kyleclaassen 900 91 11ms 8 Feb 2022 First Prev 721–800 of 3,484 Next Last