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 399th GrayJoKing 🇦🇺 847 85 33ms 2 Jul 2025 402nd ovs-code 🇩🇪 847 100 157ms 23 Aug 2023 403rd madex 🇩🇪 846 113 2ms 12 days ago 404th GolfingSuccess 🇬🇷 845 78 8ms 24 Dec 2024 405th Chinay-Domitrix 🇺🇸 844 98 2,540ms 12 days ago 406th ovs-code 🇩🇪 842 60 145ms 4 Aug 2024 407th pardouin 🇫🇷 840 43 3ms 8 Oct 2024 407th blaztoma 🇱🇹 840 43 4ms 6 Jan 2026 409th sean-niemann 🇺🇸 840 101 431ms 4 Nov 2023 409th emgordon154 840 101 525ms 26 May 2025 411th c0d3-4-F00d 🇩🇪 839 69 10ms 5 Oct 2021 411th CaedenHarper 🇨🇦 839 69 11ms 25 Aug 2025 411th madeforlosers 839 69 14ms 20 Oct 2025 414th AlephSquirrel 839 78 413ms 16 Jan 2024 414th xsot 🇸🇬 839 78 443ms 25 Jan 2024 414th kg583 🇺🇸 839 78 456ms 31 Dec 2025 417th dokutan 839 114 2ms 5 Feb 2021 418th ZakkkkAttackkkk 🇵🇭 838 86 10ms 2 Jun 2022 418th davecame 838 86 11ms 29 Feb 2024 418th Googolplexo 🇷🇺 838 86 11ms 7 hours ago 421st primo-ppcg 🇹🇭 838 90 69ms 8 Oct 2023 421st GrayJoKing 🇦🇺 838 90 101ms 9 Dec 2025 423rd KatieLG 🇬🇧 837 62 1,316ms 3 May 2021 423rd MeWhenI 🇻🇦 837 62 1,364ms 15 Dec 2021 425th Secozzi 834 61 39ms 5 May 2021 425th annaproxy 834 61 35ms 4 Jan 2022 425th PikeIt 834 61 34ms 26 Jun 2023 428th error256 833 89 9ms 1 Feb 2026 429th edsrzf 🇳🇿 832 67 7ms 22 Jul 2025 430th DialFrost 🇸🇬 831 121 98ms 1 Dec 2025 430th snoozingnewt 🇨🇦 831 121 101ms 20 days ago 432nd edsrzf 🇳🇿 831 137 46ms 27 Jan 2026 433rd primo-ppcg 🇹🇭 829 107 37ms 27 Jun 2022 434th inventshah 829 122 435ms 29 Jan 2023 434th xsot 🇸🇬 829 122 60ms 22 Jul 2024 436th lynn 828 87 11ms 7 Apr 2021 436th orthoplex 🇨🇽 828 87 10ms 29 Jul 2021 436th Steffan153 🇫🇮 828 87 11ms 15 Aug 2024 436th bizy-coder 828 87 10ms 5 Sep 2024 440th yzhs 🇩🇪 828 92 114ms 25 Jun 2023 440th edsrzf 🇳🇿 828 92 125ms 22 Dec 2025 442nd Alessandro-Balconi 🇮🇹 827 64 101ms 26 Mar 2023 443rd Shanethegamer 🇺🇸 826 127 193ms 7 Jan 2023 444th primo-ppcg 🇹🇭 823 133 1,343ms 30 Nov 2021 444th Shanethegamer 🇺🇸 823 133 1,298ms 24 Dec 2023 446th 09cf 822 123 448ms 10 Dec 2025 447th acotis 821 143 210ms 7 days ago 448th NewDefectus 🇮🇱 820 44 3ms 22 Jun 2021 448th ovs-code 🇩🇪 820 44 3ms 22 Jun 2023 448th Shanethegamer 🇺🇸 820 44 3ms 8 Nov 2023 448th Natanaelel 🇸🇪 820 44 3ms 7 days ago 452nd Irratix 🇳🇱 820 62 36ms 4 Mar 2022 453rd emgordon154 820 119 6ms 25 days ago 454th primo-ppcg 🇹🇭 819 88 15ms 1 Dec 2020 454th sisyphus-ppcg 🇦🇺 819 88 16ms 2 Dec 2020 454th TFeld00 🇩🇰 819 88 16ms 2 Dec 2020 454th btjones0 819 88 16ms 31 Dec 2020 454th kops-cg 819 88 15ms 11 Apr 2021 454th SirBogman 🇺🇸 819 88 16ms 29 Dec 2021 454th inventshah 819 88 16ms 7 Jan 2022 454th anter69 🇭🇺 819 88 16ms 25 Jan 2022 454th jared-hughes 819 88 15ms 7 Jul 2022 454th annaproxy 819 88 16ms 20 Nov 2022 454th rak1507 🇬🇧 819 88 16ms 5 Jan 2023 454th neel11235813 819 88 10ms 17 Jan 2023 454th Shanethegamer 🇺🇸 819 88 15ms 1 Feb 2023 454th bricknellj 819 88 20ms 7 Feb 2023 454th m-tkach 🇺🇦 819 88 16ms 14 Feb 2023 454th Fracture17 819 88 16ms 12 Apr 2023 454th zacjl 819 88 16ms 19 Apr 2023 454th kg583 🇺🇸 819 88 15ms 23 Jul 2023 454th StefanHabel 🇨🇦 819 88 15ms 17 Sep 2023 454th bzijlema 🇳🇱 819 88 16ms 30 Nov 2023 454th 051 🇸🇬 819 88 17ms 26 Dec 2023 454th ndren 819 88 15ms 6 Jan 2024 454th CaedenHarper 🇨🇦 819 88 16ms 2 Aug 2024 454th emgordon154 819 88 16ms 20 Sep 2024 454th Bulmenisaurus 819 88 15ms 10 Nov 2024 454th lifthrasiir 🇰🇷 819 88 32ms 14 Nov 2024 454th Mukundan314 819 88 20ms 28 Apr 2025 First Prev 401–480 of 2,109 Next Last