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 Shanethegamer 🇺🇸 799 83 2,692ms 28 Oct 2024 562nd GolfingSuccess 🇬🇷 799 111 37ms 7 days ago 563rd MeWhenI 🇻🇦 798 108 143ms 22 Jul 2024 564th blaztoma 🇱🇹 798 119 288ms 16 Aug 2025 565th Steffan153 🇫🇮 797 49 169ms 11 Feb 2026 566th Shanethegamer 🇺🇸 797 62 12ms 19 Nov 2022 566th jared-hughes 797 62 11ms 16 Mar 2023 566th raphaelimahorn 797 62 12ms 24 Mar 2023 566th Maznek 797 62 11ms 28 Jun 2023 566th unfinishedprogram 797 62 13ms 5 Jul 2023 571st DialFrost 🇸🇬 796 47 13ms 25 Sep 2024 572nd rak1507 🇬🇧 796 62 31ms 22 Nov 2022 572nd fourth-bit 796 62 35ms 7 Dec 2022 572nd SniperSmiley 🇺🇸 796 62 33ms 10 Dec 2022 572nd Fracture17 796 62 32ms 14 Apr 2023 572nd quimey 796 62 35ms 23 Jun 2023 572nd dranjohn 796 62 50ms 11 Sep 2023 572nd RedzGoose 🇦🇺 796 62 12ms 17 Jun 2024 572nd smilesformiles3 796 62 11ms 21 Jun 2025 572nd 77Tigers 796 62 32ms 13 Jan 2026 581st blaztoma 🇱🇹 796 96 61ms 17 Aug 2025 582nd prestosilver 🇺🇸 795 83 124ms 31 Dec 2025 583rd inventshah 794 59 444ms 22 Jan 2024 583rd CaedenHarper 🇨🇦 794 59 480ms 30 Dec 2024 583rd dokutan 794 59 446ms 14 Feb 2026 586th pandapawskat 793 73 2ms 6 Dec 2022 586th elgan65536 🇺🇸 793 73 2ms 5 Mar 2024 586th blaztoma 🇱🇹 793 73 2ms 16 Aug 2025 586th Emutis 🇱🇹 793 73 2ms 16 Aug 2025 590th albanian-laundromat 791 177 1,505ms 15 Oct 2025 591st emplv 🇱🇻 790 82 117ms 25 Nov 2022 591st tobeannouncd 790 82 169ms 21 May 2024 593rd 09cf 790 109 123ms 26 Sep 2023 594th rucin93 🇵🇱 789 70 16ms 26 Jul 2025 595th Natanaelel 🇸🇪 788 41 7ms 30 Dec 2022 595th o0lit3 🇺🇸 788 41 7ms 20 Jun 2023 597th MeWhenI 🇻🇦 786 46 42ms 24 Nov 2022 597th m-tkach 🇺🇦 786 46 38ms 31 Aug 2023 599th alemelis 785 62 2,097ms 20 Sep 2024 600th Natanaelel 🇸🇪 784 63 12ms 21 Jul 2023 601st edsrzf 🇳🇿 784 75 5ms 10 Nov 2025 602nd Shanethegamer 🇺🇸 784 120 27ms 27 Dec 2022 603rd 09cf 783 32 5ms 5 Sep 2023 603rd mousetail 🇳🇱 783 32 4ms 15 Mar 2024 603rd MeWhenI 🇻🇦 783 32 4ms 17 Feb 2025 606th albanian-laundromat 783 56 1,170ms 22 Sep 2025 607th guilhem-roy 🇫🇷 783 63 37ms 21 Nov 2022 607th nstearns96 🇬🇧 783 63 31ms 6 Jan 2023 607th Tess2662 783 63 11ms 4 Mar 2023 607th lhulinsky 783 63 36ms 23 Oct 2024 607th croc54 783 63 48ms 8 Jan 2025 607th andrewjc2000 783 63 38ms 29 Jul 2025 607th KasperKivimaeki 🇫🇮 783 63 29ms 25 Oct 2025 614th bac0id 783 74 2ms 27 Sep 2023 615th Andriamanitra 🇫🇮 782 49 1,314ms 18 Oct 2023 616th msbranicky 782 178 1,674ms 16 Sep 2025 617th sean-niemann 🇺🇸 781 50 175ms 19 May 2025 618th Alessandro-Balconi 🇮🇹 780 63 84ms 12 Jul 2023 619th MeWhenI 🇻🇦 780 85 2,708ms 24 Oct 2024 620th Irratix 🇳🇱 780 98 62ms 3 Aug 2023 620th Emutis 🇱🇹 780 98 64ms 15 Aug 2025 622nd albanian-laundromat 777 80 40ms 2 Sep 2025 623rd Shanethegamer 🇺🇸 776 80 2ms 19 Nov 2022 623rd frosster 🇨🇦 776 80 2ms 8 Feb 2026 625th Shanethegamer 🇺🇸 776 112 26ms 22 Nov 2022 626th DialFrost 🇸🇬 774 53 291ms 30 Jul 2024 627th GrayJoKing 🇦🇺 773 83 340ms 26 Jun 2023 628th BambooleanLogic 🇸🇪 772 64 11ms 2 Dec 2022 628th tayloia 🇬🇧 772 64 10ms 9 Jan 2023 628th Argeento 🇵🇱 772 64 11ms 29 Aug 2023 631st MeWhenI 🇻🇦 772 84 124ms 24 Nov 2022 632nd jerrandolph 772 123 270ms 21 Dec 2023 633rd CedricGebistorf 771 64 34ms 4 May 2023 633rd cros107 🇦🇺 771 64 36ms 5 Oct 2023 633rd logvp 771 64 32ms 3 Jan 2024 633rd namelessiw 771 64 34ms 10 Jan 2024 633rd jmfk 771 64 39ms 5 Apr 2024 633rd hiichbindermax 771 64 40ms 4 Sep 2024 633rd madex 🇩🇪 771 64 14ms 12 days ago 640th janbehrens 🇩🇪 769 42 3ms 20 Nov 2022 First Prev 561–640 of 1,669 Next Last