The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 MeWhenI 🇻🇦 799 69 140ms 24 Nov 2022 562nd Shanethegamer 🇺🇸 799 83 2,692ms 28 Oct 2024 563rd GolfingSuccess 🇬🇷 799 111 37ms 7 days ago 564th MeWhenI 🇻🇦 798 108 143ms 22 Jul 2024 565th blaztoma 🇱🇹 798 119 288ms 16 Aug 2025 566th Steffan153 🇫🇮 797 49 169ms 11 Feb 2026 567th Shanethegamer 🇺🇸 797 62 12ms 19 Nov 2022 567th jared-hughes 797 62 11ms 16 Mar 2023 567th raphaelimahorn 797 62 12ms 24 Mar 2023 567th Maznek 797 62 11ms 28 Jun 2023 567th unfinishedprogram 797 62 13ms 5 Jul 2023 572nd DialFrost 🇸🇬 796 47 13ms 25 Sep 2024 573rd rak1507 🇬🇧 796 62 31ms 22 Nov 2022 573rd fourth-bit 796 62 35ms 7 Dec 2022 573rd SniperSmiley 🇺🇸 796 62 33ms 10 Dec 2022 573rd Fracture17 796 62 32ms 14 Apr 2023 573rd quimey 796 62 35ms 23 Jun 2023 573rd dranjohn 796 62 50ms 11 Sep 2023 573rd RedzGoose 🇦🇺 796 62 12ms 17 Jun 2024 573rd smilesformiles3 796 62 11ms 21 Jun 2025 573rd 77Tigers 796 62 32ms 13 Jan 2026 582nd blaztoma 🇱🇹 796 96 61ms 17 Aug 2025 583rd prestosilver 🇺🇸 795 83 124ms 31 Dec 2025 584th inventshah 794 59 444ms 22 Jan 2024 584th CaedenHarper 🇨🇦 794 59 480ms 30 Dec 2024 584th dokutan 794 59 446ms 14 Feb 2026 587th pandapawskat 793 73 2ms 6 Dec 2022 587th elgan65536 🇺🇸 793 73 2ms 5 Mar 2024 587th blaztoma 🇱🇹 793 73 2ms 16 Aug 2025 587th Emutis 🇱🇹 793 73 2ms 16 Aug 2025 591st albanian-laundromat 791 177 1,505ms 15 Oct 2025 592nd emplv 🇱🇻 790 82 117ms 25 Nov 2022 592nd tobeannouncd 790 82 169ms 21 May 2024 594th 09cf 790 109 123ms 26 Sep 2023 595th rucin93 🇵🇱 789 70 16ms 26 Jul 2025 596th Natanaelel 🇸🇪 788 41 7ms 30 Dec 2022 596th o0lit3 🇺🇸 788 41 7ms 20 Jun 2023 598th MeWhenI 🇻🇦 786 46 42ms 24 Nov 2022 598th m-tkach 🇺🇦 786 46 38ms 31 Aug 2023 600th alemelis 785 62 2,097ms 20 Sep 2024 601st Natanaelel 🇸🇪 784 63 12ms 21 Jul 2023 602nd edsrzf 🇳🇿 784 75 5ms 10 Nov 2025 603rd Shanethegamer 🇺🇸 784 120 27ms 27 Dec 2022 604th 09cf 783 32 5ms 5 Sep 2023 604th mousetail 🇳🇱 783 32 4ms 15 Mar 2024 604th MeWhenI 🇻🇦 783 32 4ms 17 Feb 2025 607th albanian-laundromat 783 56 1,170ms 22 Sep 2025 608th guilhem-roy 🇫🇷 783 63 37ms 21 Nov 2022 608th nstearns96 🇬🇧 783 63 31ms 6 Jan 2023 608th Tess2662 783 63 11ms 4 Mar 2023 608th lhulinsky 783 63 36ms 23 Oct 2024 608th croc54 783 63 48ms 8 Jan 2025 608th andrewjc2000 783 63 38ms 29 Jul 2025 608th KasperKivimaeki 🇫🇮 783 63 29ms 25 Oct 2025 615th bac0id 783 74 2ms 27 Sep 2023 616th Andriamanitra 🇫🇮 782 49 1,314ms 18 Oct 2023 617th msbranicky 782 178 1,674ms 16 Sep 2025 618th sean-niemann 🇺🇸 781 50 175ms 19 May 2025 619th Alessandro-Balconi 🇮🇹 780 63 84ms 12 Jul 2023 620th MeWhenI 🇻🇦 780 85 2,708ms 24 Oct 2024 621st Irratix 🇳🇱 780 98 62ms 3 Aug 2023 621st Emutis 🇱🇹 780 98 64ms 15 Aug 2025 623rd albanian-laundromat 777 80 40ms 2 Sep 2025 624th Shanethegamer 🇺🇸 776 80 2ms 19 Nov 2022 624th frosster 🇨🇦 776 80 2ms 8 Feb 2026 626th Shanethegamer 🇺🇸 776 112 26ms 22 Nov 2022 627th DialFrost 🇸🇬 774 53 291ms 30 Jul 2024 628th GrayJoKing 🇦🇺 773 83 340ms 26 Jun 2023 629th BambooleanLogic 🇸🇪 772 64 11ms 2 Dec 2022 629th tayloia 🇬🇧 772 64 10ms 9 Jan 2023 629th Argeento 🇵🇱 772 64 11ms 29 Aug 2023 632nd MeWhenI 🇻🇦 772 84 124ms 24 Nov 2022 633rd jerrandolph 772 123 270ms 21 Dec 2023 634th CedricGebistorf 771 64 34ms 4 May 2023 634th cros107 🇦🇺 771 64 36ms 5 Oct 2023 634th logvp 771 64 32ms 3 Jan 2024 634th namelessiw 771 64 34ms 10 Jan 2024 634th jmfk 771 64 39ms 5 Apr 2024 634th hiichbindermax 771 64 40ms 4 Sep 2024 634th madex 🇩🇪 771 64 14ms 12 days ago First Prev 561–640 of 1,671 Next Last