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 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 FortuiteMan 🇫🇷 716 102 31ms 6 Jan 2026 722nd ovs-code 🇩🇪 715 65 74ms 19 Sep 2023 723rd andre-lameirinhas 🇵🇹 715 69 15ms 23 Feb 2023 723rd jtaxen 715 69 15ms 30 Mar 2024 723rd FranklinJiaChen 715 69 39ms 5 Aug 2024 726th Irratix 🇳🇱 715 81 2ms 11 Dec 2022 727th snoozingnewt 🇨🇦 714 133 284ms 13 Oct 2025 728th CLOStrophobic 🇮🇹 712 73 25ms 18 Feb 2025 729th blaztoma 🇱🇹 712 121 123ms 2 Sep 2025 730th MeWhenI 🇻🇦 711 118 1,316ms 14 Jun 2023 731st anter69 🇭🇺 710 54 1,293ms 24 Feb 2023 732nd postie77 709 106 413ms 19 May 2023 733rd SirBogman 🇺🇸 708 38 190ms 20 Nov 2022 734th msbranicky 708 108 54ms 10 Jan 2024 735th Jacob385 708 112 480ms 27 Oct 2025 736th trinityy-7 706 70 21ms 17 Mar 2024 737th klixel 🇨🇦 706 82 2ms 17 Oct 2024 738th albanian-laundromat 706 88 25ms 22 Jul 2025 739th albanian-laundromat 706 205 12ms 26 Sep 2025 740th DialFrost 🇸🇬 705 69 344ms 31 Jul 2024 741st b10011 🇫🇮 705 70 16ms 9 Jan 2023 741st Just4FunCoder 705 70 41ms 23 Mar 2023 741st knutae 🇳🇴 705 70 15ms 29 Dec 2023 741st wobblybits 705 70 17ms 18 Aug 2025 741st jacekwladzinski 705 70 29ms 4 Oct 2025 746th RockOfStone 705 88 2ms 9 Mar 2024 747th MeWhenI 🇻🇦 702 46 2ms 15 Apr 2023 748th blaztoma 🇱🇹 702 70 94ms 17 Aug 2025 749th msbranicky 700 123 122ms 19 Sep 2023 750th blaztoma 🇱🇹 700 124 26ms 2 Sep 2025 751st Yewzir 🇧🇪 699 67 380ms 7 Feb 2024 752nd blaztoma 🇱🇹 698 89 38ms 16 Aug 2025 753rd ovs-code 🇩🇪 697 56 143ms 3 Aug 2024 754th Shanethegamer 🇺🇸 697 93 207ms 21 Apr 2025 755th akshatj27 🇦🇶 696 71 16ms 12 Dec 2022 756th ovs-code 🇩🇪 696 94 11ms 18 Jul 2023 757th HumanoidCPU 695 52 50ms 26 Jun 2024 758th PyryL 🇫🇮 695 71 16ms 23 Aug 2024 758th YAJUE114514 695 71 15ms 13 Jul 2025 758th madeforlosers 695 71 15ms 13 Nov 2025 761st CaedenHarper 🇨🇦 695 114 647ms 6 Oct 2025 762nd MeWhenI 🇻🇦 693 54 8ms 17 Nov 2023 763rd emgordon154 690 29 80ms 14 Nov 2025 764th snoozingnewt 🇨🇦 690 90 40ms 13 Oct 2025 765th h3ra993huskp 🇯🇵 689 115 508ms 30 Nov 2025 766th Yewzir 🇧🇪 686 106 468ms 7 Feb 2024 767th Yewzir 🇧🇪 686 203 2,020ms 14 Nov 2025 768th pardouin 🇫🇷 685 57 147ms 26 Jul 2025 769th msbranicky 685 72 15ms 19 Aug 2023 769th adamnielson42 🇺🇸 685 72 15ms 21 Aug 2023 769th Masttest 685 72 16ms 15 Feb 2024 769th Code-Coder-coder 685 72 14ms 24 Nov 2025 773rd emgordon154 684 122 116ms 5 Dec 2025 774th MeWhenI 🇻🇦 683 91 38ms 17 Feb 2023 775th BREMAUCY 🇫🇷 682 53 37ms 19 May 2023 775th annaproxy 682 53 49ms 22 Sep 2023 775th TheZwierzLF 🇵🇱 682 53 42ms 21 Dec 2025 778th msbranicky 682 91 2ms 29 Sep 2023 779th blaztoma 🇱🇹 679 97 93ms 2 Sep 2025 780th snoozingnewt 🇨🇦 678 127 121ms 13 Oct 2025 781st Kacarott 🇦🇺 678 251 3ms 27 Aug 2024 782nd KrausRaus 🇺🇸 677 73 14ms 7 Dec 2022 782nd LordSir101 677 73 16ms 8 Aug 2025 784th arctouch-cristiannevianna 677 111 418ms 31 May 2023 785th jhpaques 🇫🇷 676 73 40ms 30 Nov 2022 785th Andrey135296 676 73 18ms 21 Sep 2024 787th Shanethegamer 🇺🇸 676 98 1,034ms 23 Nov 2022 788th KatieLG 🇬🇧 672 98 113ms 15 Jan 2023 789th Shanethegamer 🇺🇸 671 86 30ms 21 Apr 2023 790th olleicua 🇺🇸 667 30 284ms 11 Mar 2024 791st za3k 667 74 11ms 20 Nov 2022 791st MaxElf999 667 74 22ms 21 Nov 2022 791st celiendonze 🇨🇭 667 74 15ms 25 Apr 2023 791st moustave 667 74 35ms 2 Dec 2024 795th janAkali 🇷🇺 667 99 124ms 17 May 2025 796th janbehrens 🇩🇪 666 73 240ms 23 Nov 2022 797th msbranicky 661 98 110ms 10 Jan 2024 798th typeswitch-dev 🇵🇹 661 99 7ms 17 Aug 2023 799th kmathis22 661 120 583ms 27 Oct 2025 800th CaedenHarper 🇨🇦 659 114 391ms 20 Oct 2025 First Prev 721–800 of 1,669 Next Last