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 720th CLOStrophobic 🇮🇹 712 73 25ms 18 Feb 2025 722nd blaztoma 🇱🇹 712 121 121ms 2 Sep 2025 723rd MeWhenI 🇻🇦 711 118 1,316ms 14 Jun 2023 724th anter69 🇭🇺 710 54 1,293ms 24 Feb 2023 725th edsrzf 🇳🇿 710 93 397ms 20 Jun 2025 726th postie77 709 106 413ms 19 May 2023 727th SirBogman 🇺🇸 708 38 190ms 20 Nov 2022 728th msbranicky 708 108 54ms 10 Jan 2024 729th Jacob385 708 112 480ms 27 Oct 2025 730th trinityy-7 706 70 21ms 17 Mar 2024 731st klixel 🇨🇦 706 82 2ms 17 Oct 2024 732nd albanian-laundromat 706 88 25ms 22 Jul 2025 733rd albanian-laundromat 706 205 12ms 26 Sep 2025 734th DialFrost 🇸🇬 705 69 344ms 31 Jul 2024 735th b10011 🇫🇮 705 70 16ms 9 Jan 2023 735th Just4FunCoder 705 70 41ms 23 Mar 2023 735th knutae 🇳🇴 705 70 15ms 29 Dec 2023 735th wobblybits 705 70 17ms 18 Aug 2025 735th jacekwladzinski 705 70 29ms 4 Oct 2025 740th RockOfStone 705 88 2ms 9 Mar 2024 741st MeWhenI 🇻🇦 702 46 2ms 15 Apr 2023 742nd blaztoma 🇱🇹 702 70 94ms 17 Aug 2025 743rd msbranicky 700 123 129ms 19 Sep 2023 744th blaztoma 🇱🇹 700 124 26ms 2 Sep 2025 745th Yewzir 🇧🇪 699 67 380ms 7 Feb 2024 746th blaztoma 🇱🇹 698 89 38ms 16 Aug 2025 747th ovs-code 🇩🇪 697 56 143ms 3 Aug 2024 748th Shanethegamer 🇺🇸 697 93 207ms 21 Apr 2025 749th akshatj27 🇦🇶 696 71 16ms 12 Dec 2022 750th ovs-code 🇩🇪 696 94 11ms 18 Jul 2023 751st HumanoidCPU 695 52 50ms 26 Jun 2024 752nd PyryL 🇫🇮 695 71 16ms 23 Aug 2024 752nd YAJUE114514 695 71 15ms 13 Jul 2025 752nd madeforlosers 695 71 15ms 13 Nov 2025 755th CaedenHarper 🇨🇦 695 114 647ms 6 Oct 2025 756th MeWhenI 🇻🇦 693 54 8ms 17 Nov 2023 757th emgordon154 690 29 80ms 14 Nov 2025 758th snoozingnewt 🇨🇦 690 90 40ms 13 Oct 2025 759th h3ra993huskp 🇯🇵 689 115 508ms 30 Nov 2025 760th Yewzir 🇧🇪 686 106 468ms 7 Feb 2024 761st Yewzir 🇧🇪 686 203 2,020ms 14 Nov 2025 762nd pardouin 🇫🇷 685 57 147ms 26 Jul 2025 763rd msbranicky 685 72 15ms 19 Aug 2023 763rd adamnielson42 🇺🇸 685 72 15ms 21 Aug 2023 763rd Masttest 685 72 16ms 15 Feb 2024 763rd Code-Coder-coder 685 72 14ms 24 Nov 2025 767th MeWhenI 🇻🇦 683 91 38ms 17 Feb 2023 768th BREMAUCY 🇫🇷 682 53 37ms 19 May 2023 768th annaproxy 682 53 49ms 22 Sep 2023 768th TheZwierzLF 🇵🇱 682 53 42ms 21 Dec 2025 771st msbranicky 682 91 2ms 29 Sep 2023 772nd emgordon154 681 122 116ms 5 Dec 2025 773rd blaztoma 🇱🇹 679 97 84ms 2 Sep 2025 774th snoozingnewt 🇨🇦 678 127 119ms 13 Oct 2025 775th Kacarott 🇦🇺 678 251 3ms 27 Aug 2024 776th KrausRaus 🇺🇸 677 73 14ms 7 Dec 2022 776th LordSir101 677 73 16ms 8 Aug 2025 778th arctouch-cristiannevianna 677 111 418ms 31 May 2023 779th jhpaques 🇫🇷 676 73 40ms 30 Nov 2022 779th Andrey135296 676 73 18ms 21 Sep 2024 781st Shanethegamer 🇺🇸 676 98 1,034ms 23 Nov 2022 782nd KatieLG 🇬🇧 672 98 107ms 15 Jan 2023 783rd Shanethegamer 🇺🇸 670 86 30ms 21 Apr 2023 784th olleicua 🇺🇸 667 30 284ms 11 Mar 2024 785th za3k 667 74 11ms 20 Nov 2022 785th MaxElf999 667 74 22ms 21 Nov 2022 785th celiendonze 🇨🇭 667 74 15ms 25 Apr 2023 785th moustave 667 74 35ms 2 Dec 2024 789th janAkali 🇷🇺 667 99 124ms 17 May 2025 790th janbehrens 🇩🇪 666 73 240ms 23 Nov 2022 791st msbranicky 661 98 110ms 10 Jan 2024 792nd typeswitch-dev 🇵🇹 661 99 7ms 17 Aug 2023 793rd kmathis22 661 120 583ms 27 Oct 2025 794th CaedenHarper 🇨🇦 659 114 391ms 20 Oct 2025 795th betaveros 658 75 15ms 31 Dec 2022 795th Wildst 658 75 17ms 7 Jul 2023 795th mosho-p 658 75 24ms 14 Sep 2023 795th eiburns 658 75 16ms 26 Oct 2023 799th tatzyr 🇯🇵 657 55 39ms 12 Feb 2025 800th MeWhenI 🇻🇦 655 75 91ms 13 Dec 2022 First Prev 721–800 of 1,664 Next Last