The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 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 630th cros107 🇦🇺 920 89 11ms 1 Nov 2025 630th kitotch 920 89 11ms 13 days ago 643rd Alex-x90 🇺🇸 920 104 138ms 25 Mar 2023 644th m-tkach 🇺🇦 920 142 4ms 14 Jan 2025 645th AlephSquirrel 919 52 59ms 30 Dec 2022 646th Lydxn 🇨🇦 919 83 5ms 11 May 2023 646th btnlq 919 83 6ms 21 Oct 2023 646th kg583 🇺🇸 919 83 6ms 5 days ago 649th kops-cg 919 94 14ms 3 Mar 2025 650th pardouin 🇫🇷 919 138 285ms 29 Sep 2024 650th sean-niemann 🇺🇸 919 138 294ms 18 Mar 2025 652nd sean-niemann 🇺🇸 918 85 3ms 27 Dec 2024 653rd Shanethegamer 🇺🇸 918 105 161ms 22 Nov 2021 654th ovs-code 🇩🇪 917 81 33ms 22 Oct 2023 654th sean-niemann 🇺🇸 917 81 36ms 14 Aug 2025 656th m-tkach 🇺🇦 917 123 26ms 21 Aug 2023 657th albanian-laundromat 916 82 1,051ms 24 Sep 2025 658th nwellnhof 🇩🇪 916 106 3ms 12 Jun 2022 659th CLOStrophobic 🇮🇹 916 111 40ms 13 Feb 2025 659th kg583 🇺🇸 916 111 42ms 15 Feb 2025 661st tuffnatty 🇩🇪 916 126 4ms 17 Jul 2023 662nd Natanaelel 🇸🇪 915 60 110ms 6 days ago 663rd nwellnhof 🇩🇪 915 66 3ms 5 Dec 2021 664th Lydxn 🇨🇦 915 103 1,181ms 3 Apr 2022 665th Kacarott 🇦🇺 915 105 67ms 13 Sep 2024 666th pardouin 🇫🇷 915 109 2,736ms 31 Oct 2024 666th emgordon154 915 109 2,619ms 31 Oct 2024 668th primo-ppcg 🇹🇭 915 120 22ms 23 Nov 2021 668th AlephSquirrel 915 120 23ms 5 Feb 2024 668th CLOStrophobic 🇮🇹 915 120 22ms 18 Jan 2025 671st Liibe 915 136 451ms 25 Sep 2025 672nd Steffan153 🇫🇮 914 104 108ms 16 Oct 2022 673rd pardouin 🇫🇷 914 116 461ms 17 Aug 2024 674th Lydxn 🇨🇦 912 71 221ms 19 Jul 2022 675th alemelis 912 78 331ms 20 Sep 2024 676th emgordon154 911 85 12ms 22 Nov 2021 676th itsh01 911 85 16ms 25 Nov 2021 676th nathanadams 🇳🇿 911 85 12ms 16 Apr 2023 676th dmrichwa 🇺🇸 911 85 11ms 6 Aug 2024 676th ovs-code 🇩🇪 911 85 11ms 17 Nov 2024 676th Salutations45 911 85 11ms 27 Nov 2024 676th attila8192 911 85 14ms 20 Jul 2025 683rd SteveHales 911 93 93ms 19 Sep 2025 684th janbehrens 🇩🇪 911 105 130ms 5 Mar 2022 684th alomiF 911 105 132ms 30 Aug 2023 686th peterprescott 910 90 12ms 22 Nov 2021 686th Fishron 910 90 11ms 24 Nov 2021 686th knutae 🇳🇴 910 90 12ms 25 Nov 2021 686th RDShah 910 90 11ms 25 Nov 2021 686th sbr075 910 90 13ms 7 Dec 2021 686th CedricGebistorf 910 90 12ms 24 Feb 2022 686th hiichbindermax 910 90 11ms 26 Feb 2022 686th LHuitre 910 90 11ms 15 Apr 2022 686th alex-costea 910 90 11ms 15 Apr 2022 686th Indivicivet 910 90 11ms 9 May 2022 686th AGoyet 910 90 11ms 11 Jul 2022 686th galloj 🇨🇿 910 90 11ms 16 Aug 2022 686th Yareeeema 910 90 11ms 18 Aug 2022 686th jfallon1997 910 90 11ms 6 Sep 2022 686th MaxElf999 910 90 11ms 3 Oct 2022 686th TheBlupper 910 90 11ms 3 Oct 2022 686th ValentinCassayre 910 90 11ms 9 Oct 2022 686th Omega65536 🇩🇪 910 90 12ms 22 Nov 2022 686th jacksonhenry3 910 90 11ms 2 Dec 2022 686th Techdude01 910 90 11ms 17 Dec 2022 686th M0PKOBKA 910 90 11ms 26 Dec 2022 686th NOS4A5I 910 90 12ms 30 Dec 2022 686th TheGlitcher1705 910 90 39ms 16 Mar 2023 686th SB-945 910 90 12ms 10 Jul 2023 686th cingulataluke 910 90 11ms 26 Aug 2023 686th dranjohn 910 90 12ms 16 Sep 2023 686th minhtrancccp 910 90 11ms 11 Oct 2023 686th pde-bakk 🇳🇱 910 90 12ms 23 Oct 2023 686th NickTheEASDude 🇺🇸 910 90 11ms 15 Nov 2023 686th doktoren 910 90 12ms 10 Dec 2023 686th Chimplement 910 90 11ms 13 Dec 2023 686th epic-programmer-guy 910 90 11ms 31 Dec 2023 686th Jacob385 910 90 12ms 29 Feb 2024 686th OCNeve 910 90 11ms 18 Jun 2024 686th CutSandstone 910 90 42ms 4 Jul 2024 First Prev 641–720 of 3,484 Next Last