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 561st GolfingSuccess 🇬🇷 799 111 37ms 7 days ago 562nd MeWhenI 🇻🇦 798 108 143ms 22 Jul 2024 563rd blaztoma 🇱🇹 798 119 288ms 16 Aug 2025 564th Steffan153 🇫🇮 797 49 169ms 11 Feb 2026 565th Shanethegamer 🇺🇸 797 62 12ms 19 Nov 2022 565th jared-hughes 797 62 11ms 16 Mar 2023 565th raphaelimahorn 797 62 12ms 24 Mar 2023 565th Maznek 797 62 11ms 28 Jun 2023 565th unfinishedprogram 797 62 13ms 5 Jul 2023 570th DialFrost 🇸🇬 796 47 13ms 25 Sep 2024 571st rak1507 🇬🇧 796 62 31ms 22 Nov 2022 571st fourth-bit 796 62 35ms 7 Dec 2022 571st SniperSmiley 🇺🇸 796 62 33ms 10 Dec 2022 571st Fracture17 796 62 32ms 14 Apr 2023 571st quimey 796 62 35ms 23 Jun 2023 571st dranjohn 796 62 50ms 11 Sep 2023 571st RedzGoose 🇦🇺 796 62 12ms 17 Jun 2024 571st smilesformiles3 796 62 11ms 21 Jun 2025 571st 77Tigers 796 62 32ms 13 Jan 2026 580th blaztoma 🇱🇹 796 96 61ms 17 Aug 2025 581st prestosilver 🇺🇸 795 83 124ms 31 Dec 2025 582nd inventshah 794 59 444ms 22 Jan 2024 582nd CaedenHarper 🇨🇦 794 59 480ms 30 Dec 2024 582nd dokutan 794 59 446ms 14 Feb 2026 585th pandapawskat 793 73 2ms 6 Dec 2022 585th elgan65536 🇺🇸 793 73 2ms 5 Mar 2024 585th blaztoma 🇱🇹 793 73 2ms 16 Aug 2025 585th Emutis 🇱🇹 793 73 2ms 16 Aug 2025 589th albanian-laundromat 791 177 1,505ms 15 Oct 2025 590th emplv 🇱🇻 790 82 117ms 25 Nov 2022 590th tobeannouncd 790 82 169ms 21 May 2024 592nd 09cf 790 109 123ms 26 Sep 2023 593rd rucin93 🇵🇱 789 70 16ms 26 Jul 2025 594th Natanaelel 🇸🇪 788 41 7ms 30 Dec 2022 594th o0lit3 🇺🇸 788 41 7ms 20 Jun 2023 596th MeWhenI 🇻🇦 786 46 42ms 24 Nov 2022 596th m-tkach 🇺🇦 786 46 38ms 31 Aug 2023 598th alemelis 785 62 2,097ms 20 Sep 2024 599th Natanaelel 🇸🇪 784 63 12ms 21 Jul 2023 600th edsrzf 🇳🇿 784 75 5ms 10 Nov 2025 601st Shanethegamer 🇺🇸 784 120 27ms 27 Dec 2022 602nd 09cf 783 32 5ms 5 Sep 2023 602nd mousetail 🇳🇱 783 32 4ms 15 Mar 2024 602nd MeWhenI 🇻🇦 783 32 4ms 17 Feb 2025 605th albanian-laundromat 783 56 1,170ms 22 Sep 2025 606th guilhem-roy 🇫🇷 783 63 37ms 21 Nov 2022 606th nstearns96 🇬🇧 783 63 31ms 6 Jan 2023 606th Tess2662 783 63 11ms 4 Mar 2023 606th lhulinsky 783 63 36ms 23 Oct 2024 606th croc54 783 63 48ms 8 Jan 2025 606th andrewjc2000 783 63 38ms 29 Jul 2025 606th KasperKivimaeki 🇫🇮 783 63 29ms 25 Oct 2025 613th bac0id 783 74 2ms 27 Sep 2023 614th Andriamanitra 🇫🇮 782 49 1,314ms 18 Oct 2023 615th msbranicky 782 178 1,674ms 16 Sep 2025 616th sean-niemann 🇺🇸 781 50 175ms 19 May 2025 617th Alessandro-Balconi 🇮🇹 780 63 84ms 12 Jul 2023 618th MeWhenI 🇻🇦 780 85 2,708ms 24 Oct 2024 619th Irratix 🇳🇱 780 98 62ms 3 Aug 2023 619th Emutis 🇱🇹 780 98 64ms 15 Aug 2025 621st albanian-laundromat 777 80 40ms 2 Sep 2025 622nd Shanethegamer 🇺🇸 776 80 2ms 19 Nov 2022 622nd frosster 🇨🇦 776 80 2ms 8 Feb 2026 624th Shanethegamer 🇺🇸 776 112 26ms 22 Nov 2022 625th DialFrost 🇸🇬 774 53 291ms 30 Jul 2024 626th GrayJoKing 🇦🇺 773 83 340ms 26 Jun 2023 627th BambooleanLogic 🇸🇪 772 64 11ms 2 Dec 2022 627th tayloia 🇬🇧 772 64 10ms 9 Jan 2023 627th Argeento 🇵🇱 772 64 11ms 29 Aug 2023 630th MeWhenI 🇻🇦 772 84 124ms 24 Nov 2022 631st jerrandolph 772 123 270ms 21 Dec 2023 632nd CedricGebistorf 771 64 34ms 4 May 2023 632nd cros107 🇦🇺 771 64 36ms 5 Oct 2023 632nd logvp 771 64 32ms 3 Jan 2024 632nd namelessiw 771 64 34ms 10 Jan 2024 632nd jmfk 771 64 39ms 5 Apr 2024 632nd hiichbindermax 771 64 40ms 4 Sep 2024 632nd madex 🇩🇪 771 64 14ms 11 days ago 639th janbehrens 🇩🇪 769 42 3ms 20 Nov 2022 639th SirBogman 🇺🇸 769 42 3ms 22 Nov 2022 First Prev 561–640 of 1,669 Next Last