The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Look and Say 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 796th Artemis21 🇬🇧 686 105 12ms 21 Jan 2025 796th InigoK 🇺🇸 686 105 12ms 21 Aug 2025 803rd MeWhenI 🇻🇦 686 108 7ms 12 Apr 2024 804th arctouch-cristiannevianna 685 130 413ms 20 Feb 2024 805th CaedenHarper 🇨🇦 684 175 310ms 3 Nov 2025 806th sean-niemann 🇺🇸 683 148 2,838ms 7 Jan 2023 807th dokutan 682 88 1,108ms 26 Sep 2025 808th primo-ppcg 🇹🇭 681 55 32ms 4 Dec 2020 809th gnlow 🇰🇷 681 85 10ms 18 Feb 2021 809th raphaelimahorn 681 85 10ms 17 Aug 2021 809th dmrichwa 🇺🇸 681 85 11ms 4 Jun 2022 809th maxpelic 🇺🇸 681 85 12ms 11 Jul 2022 809th Re-Adventures 🇮🇳 681 85 11ms 4 Jan 2023 809th AlephSquirrel 681 85 9ms 1 Jul 2023 809th Salutations45 681 85 11ms 11 Dec 2024 809th Ralac07 🇦🇺 681 85 10ms 18 Apr 2025 817th yzhs 🇩🇪 680 106 15ms 25 Dec 2020 817th potato-jackson 680 106 15ms 5 Mar 2021 817th Bonjour27891 🇻🇳 680 106 11ms 4 Mar 2022 817th nstearns96 🇬🇧 680 106 15ms 23 Jan 2023 817th jmerle 🇳🇱 680 106 16ms 16 Feb 2023 817th Yewzir 🇧🇪 680 106 15ms 16 Apr 2023 817th Bmrl7 680 106 12ms 24 Dec 2025 824th AstroOrbis 680 109 7ms 10 days ago 825th GolfingSuccess 🇬🇷 680 222 1,429ms 3 Feb 2025 825th albanian-laundromat 680 222 1,449ms 28 Oct 2025 827th adamnielson42 🇺🇸 678 50 4ms 25 Apr 2024 828th MichalMarsalek 🇨🇿 678 122 125ms 5 Nov 2021 829th GoateSo 678 141 2ms 1 Dec 2020 830th Natanaelel 🇸🇪 676 73 16ms 22 Aug 2022 831st h3ra993huskp 🇯🇵 676 154 529ms 30 Nov 2025 832nd jerrandolph 676 177 285ms 22 Dec 2023 832nd targrik 676 177 290ms 2 Jul 2025 834th MeWhenI 🇻🇦 675 81 287ms 28 Jan 2023 835th wansacis 🇩🇪 673 86 12ms 25 Nov 2021 835th Michiocre 673 86 11ms 30 Apr 2024 837th andre-lameirinhas 🇵🇹 673 107 36ms 14 Dec 2020 837th knutae 🇳🇴 673 107 10ms 15 Jul 2021 837th itsjustfreekie 673 107 10ms 21 Sep 2021 837th eshilo-draper 673 107 10ms 7 Nov 2022 837th mbittner20 673 107 10ms 27 May 2023 837th tobeannouncd 673 107 10ms 15 Sep 2023 837th elgan65536 🇺🇸 673 107 11ms 30 Mar 2024 837th BREMAUCY 🇫🇷 673 107 16ms 24 Apr 2024 837th Ythaenagor 673 107 10ms 5 Aug 2024 837th Emutis 🇱🇹 673 107 10ms 6 Aug 2025 837th wobblybits 673 107 15ms 16 Aug 2025 837th zgialor-lab 673 107 10ms 17 Dec 2025 849th Shanethegamer 🇺🇸 672 123 2,721ms 2 Nov 2024 850th frankgraziano 670 115 12ms 25 Feb 2025 851st andersk 🇺🇸 670 175 180ms 5 Nov 2022 852nd Ralac07 🇦🇺 669 76 36ms 4 Jul 2024 853rd emgordon154 669 104 5ms 28 Dec 2024 854th Shanethegamer 🇺🇸 669 202 26ms 9 Jul 2021 855th TimCurwick 🇺🇸 667 82 276ms 3 Dec 2020 855th Feniske 🇫🇷 667 82 297ms 7 Nov 2023 855th IISResetMe 667 82 315ms 8 Apr 2025 858th abailey2020 🇺🇸 667 108 9ms 12 Dec 2020 858th ComputerKWasTaken 🇺🇸 667 108 10ms 15 Oct 2024 860th Ashikpaul 🇮🇳 666 87 9ms 29 Jul 2022 860th two-bad 🇬🇧 666 87 14ms 25 Feb 2024 862nd roavin 665 134 403ms 27 Jun 2022 863rd MeWhenI 🇻🇦 664 113 103ms 8 Mar 2023 864th CatsAreFluffy 663 50 52ms 21 Oct 2022 865th Natanaelel 🇸🇪 663 177 194ms 6 Jan 2026 866th Alex-x90 🇺🇸 662 113 1ms 7 Mar 2023 867th sean-niemann 🇺🇸 662 134 37ms 19 Nov 2024 868th Shanethegamer 🇺🇸 661 53 138ms 9 May 2021 869th KatieLG 🇬🇧 661 99 418ms 15 Jan 2024 869th m42km 661 99 426ms 4 Feb 2024 869th Kacarott 🇦🇺 661 99 436ms 10 Sep 2024 872nd argusdusty 🇺🇸 661 109 10ms 31 Dec 2020 872nd fynnkroeger 661 109 35ms 8 Feb 2021 872nd Starwort 🇬🇧 661 109 10ms 5 Mar 2021 872nd enbyte 661 109 10ms 7 Jun 2021 872nd jakobkordez 🇸🇮 661 109 10ms 10 Nov 2022 872nd b10011 🇫🇮 661 109 15ms 8 Jan 2023 872nd GulgDev 661 109 14ms 21 Mar 2023 872nd swtchblade 661 109 9ms 23 Jul 2025 880th jacobly0 🇺🇸 658 229 1,708ms 22 Apr 2024 First Prev 801–880 of 2,109 Next Last