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 720th blaztoma 🇱🇹 722 86 2ms 2 Sep 2025 722nd MeWhenI 🇻🇦 721 92 1,025ms 21 May 2023 723rd annaproxy 721 106 59ms 23 Jan 2023 723rd Babafaba 721 106 2,511ms 14 Oct 2025 725th angel-p57 🇯🇵 721 236 5ms 7 Dec 2023 726th Shanethegamer 🇺🇸 720 57 245ms 19 Nov 2022 727th Chinay-Domitrix 🇺🇸 720 92 2,532ms 8 days ago 728th DialFrost 🇸🇬 718 69 344ms 31 Jul 2024 728th dokutan 718 69 413ms 15 Aug 2024 730th klixel 🇨🇦 717 82 2ms 17 Oct 2024 731st Shanethegamer 🇺🇸 716 77 145ms 22 Nov 2022 732nd ovs-code 🇩🇪 715 65 74ms 19 Sep 2023 733rd jhpaques 🇫🇷 715 73 40ms 30 Nov 2022 733rd Andrey135296 715 73 18ms 21 Sep 2024 735th snoozingnewt 🇨🇦 714 133 284ms 13 Oct 2025 736th CLOStrophobic 🇮🇹 712 73 25ms 18 Feb 2025 737th FortuiteMan 🇫🇷 712 106 31ms 6 Jan 2026 738th blaztoma 🇱🇹 712 121 121ms 2 Sep 2025 739th MeWhenI 🇻🇦 711 118 1,316ms 14 Jun 2023 740th anter69 🇭🇺 710 54 1,293ms 24 Feb 2023 741st postie77 709 106 413ms 19 May 2023 742nd msbranicky 708 108 54ms 10 Jan 2024 743rd Jacob385 708 112 480ms 27 Oct 2025 744th trinityy-7 706 70 21ms 17 Mar 2024 745th albanian-laundromat 706 88 25ms 22 Jul 2025 746th albanian-laundromat 706 205 12ms 26 Sep 2025 747th za3k 705 74 11ms 20 Nov 2022 747th MaxElf999 705 74 22ms 21 Nov 2022 747th celiendonze 🇨🇭 705 74 15ms 25 Apr 2023 747th willschremmer 705 74 21ms 11 May 2024 747th moustave 705 74 35ms 2 Dec 2024 752nd RockOfStone 705 88 2ms 9 Mar 2024 753rd MeWhenI 🇻🇦 702 46 2ms 15 Apr 2023 754th blaztoma 🇱🇹 702 70 94ms 17 Aug 2025 755th msbranicky 700 123 129ms 19 Sep 2023 756th blaztoma 🇱🇹 700 124 26ms 2 Sep 2025 757th blaztoma 🇱🇹 698 89 38ms 16 Aug 2025 758th MeWhenI 🇻🇦 697 61 133ms 3 Aug 2024 759th Shanethegamer 🇺🇸 697 93 207ms 21 Apr 2025 760th akshatj27 🇦🇶 696 71 16ms 12 Dec 2022 761st betaveros 696 75 15ms 31 Dec 2022 761st Wildst 696 75 17ms 7 Jul 2023 761st mosho-p 696 75 24ms 14 Sep 2023 761st eiburns 696 75 16ms 26 Oct 2023 765th ovs-code 🇩🇪 696 94 11ms 18 Jul 2023 766th HumanoidCPU 695 52 50ms 26 Jun 2024 767th CaedenHarper 🇨🇦 695 114 647ms 6 Oct 2025 768th MeWhenI 🇻🇦 693 54 8ms 17 Nov 2023 769th emgordon154 690 29 80ms 14 Nov 2025 770th snoozingnewt 🇨🇦 690 90 40ms 13 Oct 2025 771st h3ra993huskp 🇯🇵 689 115 508ms 30 Nov 2025 772nd msbranicky 688 72 426ms 17 Jan 2024 773rd Edjyzod 687 76 22ms 31 Mar 2023 774th Yewzir 🇧🇪 686 106 468ms 7 Feb 2024 775th MeWhenI 🇻🇦 683 91 38ms 17 Feb 2023 776th emgordon154 683 123 116ms 5 Dec 2025 777th Yewzir 🇧🇪 683 204 2,020ms 14 Nov 2025 778th BREMAUCY 🇫🇷 682 53 37ms 19 May 2023 778th annaproxy 682 53 49ms 22 Sep 2023 778th TheZwierzLF 🇵🇱 682 53 42ms 21 Dec 2025 781st msbranicky 682 91 2ms 29 Sep 2023 782nd blaztoma 🇱🇹 679 97 84ms 2 Sep 2025 783rd janbehrens 🇩🇪 678 73 240ms 23 Nov 2022 784th Squidled 678 77 14ms 3 Jan 2023 784th mbittner20 678 77 15ms 27 May 2023 784th xyangst 678 77 15ms 7 Oct 2024 787th snoozingnewt 🇨🇦 678 127 119ms 13 Oct 2025 788th Kacarott 🇦🇺 678 251 3ms 27 Aug 2024 789th KrausRaus 🇺🇸 677 73 14ms 7 Dec 2022 789th LordSir101 677 73 16ms 8 Aug 2025 791st arctouch-cristiannevianna 677 111 418ms 31 May 2023 792nd Shanethegamer 🇺🇸 676 98 1,034ms 23 Nov 2022 793rd ovs-code 🇩🇪 672 90 24ms 21 Nov 2022 794th KatieLG 🇬🇧 672 98 107ms 15 Jan 2023 795th Shanethegamer 🇺🇸 671 86 30ms 21 Apr 2023 796th olleicua 🇺🇸 667 30 284ms 11 Mar 2024 797th janAkali 🇷🇺 667 99 124ms 17 May 2025 798th Techdude01 661 79 15ms 20 Jan 2023 798th rollershutter 661 79 41ms 4 Jul 2023 798th bob-th 661 79 16ms 19 Aug 2023 First Prev 721–800 of 1,683 Next Last