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 chars. 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 Chars Time Submitted 721st Natanaelel 🇸🇪 676 73 16ms 22 Aug 2022 722nd h3ra993huskp 🇯🇵 676 154 529ms 30 Nov 2025 723rd jerrandolph 676 177 285ms 22 Dec 2023 723rd targrik 676 177 290ms 2 Jul 2025 725th MeWhenI 🇻🇦 675 81 287ms 28 Jan 2023 726th lynn 674 87 11ms 7 Apr 2021 726th HumanoidCPU 674 87 10ms 23 May 2024 726th bizy-coder 674 87 10ms 5 Sep 2024 726th JunkIce 674 87 10ms 3 Dec 2024 730th wansacis 🇩🇪 673 86 12ms 25 Nov 2021 730th Michiocre 673 86 11ms 30 Apr 2024 732nd Shanethegamer 🇺🇸 672 123 2,721ms 2 Nov 2024 733rd dokutan 670 83 386ms 14 Feb 2026 734th frankgraziano 670 115 12ms 25 Feb 2025 735th andersk 🇺🇸 670 175 180ms 5 Nov 2022 736th emgordon154 669 104 5ms 28 Dec 2024 737th Shanethegamer 🇺🇸 669 202 26ms 9 Jul 2021 738th TimCurwick 🇺🇸 667 82 276ms 3 Dec 2020 738th Feniske 🇫🇷 667 82 297ms 7 Nov 2023 738th IISResetMe 667 82 315ms 8 Apr 2025 741st Ashikpaul 🇮🇳 666 87 9ms 29 Jul 2022 741st two-bad 🇬🇧 666 87 14ms 25 Feb 2024 743rd sisyphus-ppcg 🇦🇺 666 88 16ms 2 Dec 2020 743rd kops-cg 666 88 15ms 11 Apr 2021 743rd jared-hughes 666 88 15ms 7 Jul 2022 743rd bricknellj 666 88 20ms 7 Feb 2023 743rd Fracture17 666 88 16ms 12 Apr 2023 743rd zacjl 666 88 16ms 19 Apr 2023 743rd StefanHabel 🇨🇦 666 88 15ms 17 Sep 2023 743rd bzijlema 🇳🇱 666 88 16ms 30 Nov 2023 743rd 051 🇸🇬 666 88 17ms 26 Dec 2023 743rd FCORMERAIS 666 88 11ms 7 Mar 2024 743rd CaedenHarper 🇨🇦 666 88 16ms 2 Aug 2024 743rd Bulmenisaurus 666 88 15ms 10 Nov 2024 743rd ryyyn 🇺🇸 666 88 16ms 11 Jun 2025 743rd edsrzf 🇳🇿 666 88 15ms 12 Jun 2025 743rd Lv0Sys 🇵🇱 666 88 17ms 22 Jun 2025 743rd xDragoxboi 666 88 16ms 30 Jun 2025 743rd blaztoma 🇱🇹 666 88 16ms 1 Oct 2025 743rd Babafaba 666 88 16ms 18 Oct 2025 743rd ApoChagi 666 88 16ms 18 Oct 2025 743rd admp 666 88 16ms 9 Feb 2026 763rd roavin 665 134 403ms 27 Jun 2022 764th MeWhenI 🇻🇦 664 113 103ms 8 Mar 2023 765th Natanaelel 🇸🇪 663 177 194ms 6 Jan 2026 766th ovs-code 🇩🇪 662 84 432ms 29 Apr 2024 767th Alex-x90 🇺🇸 662 113 1ms 7 Mar 2023 768th sean-niemann 🇺🇸 662 134 37ms 19 Nov 2024 769th MeWhenI 🇻🇦 660 170 39ms 4 Sep 2024 770th jacobly0 🇺🇸 660 228 1,708ms 22 Apr 2024 771st stefangimmillaro 659 89 15ms 15 May 2022 771st jipsong 🇩🇪 659 89 17ms 21 Jul 2024 771st croc54 659 89 11ms 28 Nov 2024 774th ashtraypettingzoo 🇺🇸 657 48 2ms 5 Apr 2023 775th BBoehm 🇩🇪 657 52 134ms 12 Feb 2021 776th dizzyliam 656 126 123ms 27 Oct 2021 777th stefangimmillaro 655 136 398ms 15 Jun 2025 778th elgan65536 🇺🇸 655 179 160ms 7 Feb 2026 779th stefangimmillaro 654 159 497ms 6 Oct 2025 780th Yewzir 🇧🇪 654 183 285ms 25 Oct 2023 781st btjones0 653 118 12ms 5 Jan 2021 782nd RocketRammer 🇬🇧 651 84 261ms 14 Jul 2023 783rd RDShah 651 89 11ms 6 Jan 2022 783rd akshatj27 🇦🇶 651 89 11ms 11 Jan 2022 785th nullie 651 90 14ms 9 Jun 2022 785th FortuiteMan 🇫🇷 651 90 16ms 14 Jul 2025 785th jacekwladzinski 651 90 14ms 4 Oct 2025 785th TheSecondComing123 651 90 15ms 4 Feb 2026 789th MeWhenI 🇻🇦 651 163 43ms 20 May 2023 790th MeWhenI 🇻🇦 651 184 291ms 9 Feb 2023 791st AstroOrbis 648 109 7ms 11 days ago 792nd jared-hughes 648 119 11ms 17 Jul 2022 793rd Yewzir 🇧🇪 648 156 524ms 9 Feb 2024 794th Ralac07 🇦🇺 645 76 36ms 4 Jul 2024 795th SwordF-Official 🇺🇸 644 49 3ms 20 Jun 2025 796th RustemB 🇷🇺 644 53 143ms 6 Dec 2020 797th fourth-bit 644 91 16ms 12 Nov 2022 797th mathisfun271 644 91 16ms 13 Feb 2024 797th cros107 🇦🇺 644 91 17ms 1 Jan 2026 800th HumanoidCPU 639 87 418ms 23 May 2024 First Prev 721–800 of 2,091 Next Last