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 559th cros107 🇦🇺 792 91 17ms 1 Jan 2026 562nd primo-ppcg 🇹🇭 792 134 40ms 4 Jan 2024 563rd MeWhenI 🇻🇦 791 93 1,244ms 2 Oct 2022 564th emplv 🇱🇻 789 64 142ms 29 Oct 2024 565th albanian-laundromat 789 76 1,192ms 23 Dec 2025 566th duckyluuk 🇳🇱 788 83 503ms 17 Jul 2024 566th emgordon154 788 83 453ms 19 Apr 2025 568th ovs-code 🇩🇪 788 94 6ms 11 Dec 2023 569th ovs-code 🇩🇪 788 113 372ms 24 Aug 2023 570th MeWhenI 🇻🇦 788 132 526ms 7 Nov 2025 571st jipsong 🇩🇪 786 97 116ms 12 Jul 2024 572nd chunes3 🇺🇸 785 96 71ms 18 Sep 2023 573rd lynn 785 108 155ms 18 May 2021 574th 77Tigers 783 92 10ms 19 Feb 2021 574th Irratix 🇳🇱 783 92 15ms 25 Apr 2022 574th smartiel 783 92 11ms 18 Sep 2022 574th alexeldridge 783 92 10ms 10 Aug 2024 578th jipsong 🇩🇪 783 153 304ms 13 Jun 2024 579th DaCuteRaccoon 782 65 36ms 23 Apr 2022 580th lynn 780 48 33ms 19 Apr 2021 581st SirBogman 🇺🇸 780 136 39ms 19 Oct 2023 582nd ovs-code 🇩🇪 779 84 432ms 29 Apr 2024 583rd DialFrost 🇸🇬 778 36 41ms 1 Feb 2023 583rd ndren 778 36 43ms 7 Aug 2023 583rd snoozingnewt 🇨🇦 778 36 43ms 18 Sep 2023 583rd TheCatGuy12321 778 36 43ms 26 Aug 2024 583rd LostSyntax21 🇬🇧 778 36 43ms 6 Jan 2026 588th annaproxy 778 98 114ms 28 Jan 2022 589th Yewzir 🇧🇪 778 114 2ms 17 Oct 2023 590th frosster 🇨🇦 778 123 2ms 22 Jan 2026 591st jm600 775 93 10ms 17 Apr 2022 591st Kacarott 🇦🇺 775 93 14ms 26 Sep 2023 591st minhtrancccp 775 93 20ms 11 Jan 2024 591st qpwoeirut 775 93 10ms 1 Feb 2026 595th GrayJoKing 🇦🇺 775 139 2ms 23 Mar 2021 596th AlephSquirrel 774 128 5ms 21 Jan 2025 597th stefangimmillaro 773 97 103ms 2 Jun 2023 598th prestosilver 🇺🇸 773 107 117ms 21 Jan 2026 599th emgordon154 773 130 112ms 4 Dec 2025 600th m-tkach 🇺🇦 772 175 25ms 20 Dec 2021 600th JOrE20 772 175 26ms 27 days ago 602nd Yewzir 🇧🇪 772 195 1,782ms 25 May 2024 603rd MarcMush 🇫🇷 771 83 543ms 3 Jan 2024 604th 386asm 🇺🇸 771 115 37ms 8 May 2023 605th GrayJoKing 🇦🇺 770 85 465ms 17 Jan 2024 606th edsrzf 🇳🇿 770 91 5ms 28 Jan 2026 607th Shanethegamer 🇺🇸 770 110 157ms 1 May 2023 608th primo-ppcg 🇹🇭 768 176 25ms 5 Mar 2022 609th marcin7Cd 766 94 11ms 9 Dec 2020 609th Natanaelel 🇸🇪 766 94 15ms 22 Aug 2022 609th yujh-yujh 🇬🇸 766 94 19ms 10 Dec 2025 612th tailorspy 766 132 59ms 6 Aug 2024 613th lynn 766 137 26ms 8 Aug 2023 614th sean-niemann 🇺🇸 765 136 486ms 26 Sep 2025 615th Natanaelel 🇸🇪 764 49 32ms 24 Nov 2023 616th marshallward 🇺🇸 763 139 41ms 26 Jun 2023 617th edsrzf 🇳🇿 763 157 297ms 12 Jun 2025 618th neihousaigaai 762 76 11ms 27 May 2021 618th tayloia 🇬🇧 762 76 11ms 17 May 2023 618th biocommando 🇫🇮 762 76 10ms 9 Aug 2023 618th FortuiteMan 🇫🇷 762 76 11ms 14 Jul 2025 622nd ovs-code 🇩🇪 762 198 1,420ms 30 Jan 2025 623rd snoozingnewt 🇨🇦 761 86 450ms 16 Oct 2025 624th Alex-x90 🇺🇸 760 133 431ms 13 Apr 2023 625th albanian-laundromat 759 67 39ms 19 Feb 2026 626th jascotm 758 95 20ms 6 May 2021 627th primo-ppcg 🇹🇭 757 112 155ms 1 May 2023 628th retrohun 756 102 12ms 9 Nov 2022 629th guliyevemil1 🇦🇿 755 101 116ms 31 Jan 2021 629th cipharius 755 101 118ms 6 Feb 2021 629th YAJUE114514 755 101 119ms 30 Jul 2025 632nd typeswitch-dev 🇵🇹 755 114 4ms 24 Jul 2023 633rd roupiq 🇵🇱 755 134 429ms 18 Feb 2024 634th sean-niemann 🇺🇸 753 93 4ms 4 Nov 2023 634th targrik 753 93 5ms 5 Aug 2025 636th jared-hughes 753 127 2ms 6 Mar 2022 637th MeWhenI 🇻🇦 752 48 3ms 16 Apr 2023 637th DialFrost 🇸🇬 752 48 3ms 12 Jan 2025 637th denkyuu1 752 48 3ms 18 Feb 2026 640th olleicua 🇺🇸 752 77 12ms 20 Jan 2024 First Prev 561–640 of 2,109 Next Last