The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Inventory Sequence 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 641st Shanethegamer 🇺🇸 776 112 26ms 22 Nov 2022 642nd DialFrost 🇸🇬 774 53 291ms 30 Jul 2024 643rd namelessiw 774 64 409ms 5 Mar 2024 644th BambooleanLogic 🇸🇪 772 64 11ms 2 Dec 2022 644th tayloia 🇬🇧 772 64 10ms 9 Jan 2023 644th Argeento 🇵🇱 772 64 11ms 29 Aug 2023 647th MeWhenI 🇻🇦 772 84 124ms 24 Nov 2022 648th jerrandolph 772 123 270ms 21 Dec 2023 649th janbehrens 🇩🇪 769 42 3ms 20 Nov 2022 649th SirBogman 🇺🇸 769 42 3ms 22 Nov 2022 651st Shanethegamer 🇺🇸 769 47 40ms 31 Jan 2023 651st olleicua 🇺🇸 769 47 40ms 5 Jan 2024 653rd MichalMarsalek 🇨🇿 767 68 23ms 20 Nov 2022 653rd NerdyMcNerd42 767 68 15ms 22 Jan 2023 653rd SB-945 767 68 15ms 19 Feb 2024 653rd nemoyatpeace 767 68 15ms 15 Jan 2026 657th MeWhenI 🇻🇦 766 81 2ms 22 Jul 2024 658th GolfingSuccess 🇬🇷 762 63 9ms 19 Dec 2024 659th Stockoh 🇫🇷 762 65 455ms 24 Jun 2024 659th TheZwierzLF 🇵🇱 762 65 441ms 11 Dec 2025 661st strout 762 85 140ms 14 Dec 2023 662nd edsrzf 🇳🇿 759 124 28ms 2 days ago 663rd MeWhenI 🇻🇦 758 53 1ms 10 Feb 2023 664th andre-lameirinhas 🇵🇹 756 69 15ms 23 Feb 2023 664th jtaxen 756 69 15ms 30 Mar 2024 664th FranklinJiaChen 756 69 39ms 5 Aug 2024 664th dokutan 756 69 40ms 15 Aug 2024 664th webmiche 756 69 11ms 28 Nov 2025 669th albanian-laundromat 755 115 25ms 15 days ago 670th Babafaba 754 78 2ms 14 Oct 2025 671st KatieLG 🇬🇧 753 48 39ms 1 Sep 2024 672nd yeminghan2021 750 102 63ms 1 Feb 2025 673rd bac0id 749 66 12ms 30 Jun 2024 673rd CaedenHarper 🇨🇦 749 66 13ms 23 Aug 2025 673rd snoozingnewt 🇨🇦 749 66 11ms 13 Oct 2025 673rd iczelia 🇩🇪 749 66 15ms 23 Oct 2025 677th jared-hughes 748 50 9ms 22 Nov 2022 678th msbranicky 747 74 3ms 10 Oct 2023 679th pardouin 🇫🇷 746 57 147ms 26 Jul 2025 680th b10011 🇫🇮 745 70 16ms 9 Jan 2023 680th knutae 🇳🇴 745 70 15ms 29 Dec 2023 680th wobblybits 745 70 17ms 18 Aug 2025 680th jacekwladzinski 745 70 29ms 4 Oct 2025 684th blaztoma 🇱🇹 744 54 2ms 2 Sep 2025 684th albanian-laundromat 744 54 2ms 21 Dec 2025 686th MichalMarsalek 🇨🇿 742 89 410ms 20 Nov 2022 687th snoozingnewt 🇨🇦 739 84 2ms 13 Oct 2025 688th anter69 🇭🇺 738 49 38ms 9 Feb 2023 689th tri1212 🇻🇳 735 71 42ms 30 Jun 2024 689th PyryL 🇫🇮 735 71 16ms 23 Aug 2024 689th YAJUE114514 735 71 15ms 13 Jul 2025 689th madeforlosers 735 71 15ms 13 Nov 2025 693rd blaztoma 🇱🇹 735 90 2,698ms 2 Sep 2025 694th klixel 🇨🇦 735 104 457ms 17 Oct 2024 695th MeWhenI 🇻🇦 735 197 13ms 1 Aug 2023 696th JRaspass 🇬🇧 734 44 3ms 20 Nov 2022 697th frankgraziano 733 51 136ms 27 Feb 2025 698th ovs-code 🇩🇪 733 58 157ms 3 Aug 2024 699th kg583 🇺🇸 731 85 18ms 5 Dec 2025 700th Shanethegamer 🇺🇸 730 55 5ms 22 Nov 2022 700th snoozingnewt 🇨🇦 730 55 2ms 13 Oct 2025 702nd msbranicky 730 103 367ms 10 Jan 2024 703rd MeWhenI 🇻🇦 730 129 29ms 5 Jun 2023 704th blaztoma 🇱🇹 728 89 108ms 17 Aug 2025 705th emgordon154 727 91 2,683ms 28 Oct 2024 706th SirBogman 🇺🇸 726 43 190ms 20 Nov 2022 707th Irratix 🇳🇱 726 81 2ms 11 Dec 2022 708th ovs-code 🇩🇪 726 95 30ms 2 Jul 2024 709th msbranicky 725 72 15ms 19 Aug 2023 709th adamnielson42 🇺🇸 725 72 15ms 21 Aug 2023 709th Masttest 725 72 16ms 15 Feb 2024 709th Code-Coder-coder 725 72 14ms 24 Nov 2025 713th TFeld00 🇩🇰 723 50 40ms 3 Sep 2024 714th KatieLG 🇬🇧 723 53 1,465ms 3 Jan 2024 715th Shanethegamer 🇺🇸 722 86 8ms 23 Nov 2022 715th blaztoma 🇱🇹 722 86 2ms 2 Sep 2025 717th MeWhenI 🇻🇦 721 92 1,025ms 21 May 2023 718th annaproxy 721 106 59ms 23 Jan 2023 718th Babafaba 721 106 2,511ms 14 Oct 2025 720th angel-p57 🇯🇵 721 236 5ms 7 Dec 2023 First Prev 641–720 of 1,680 Next Last