The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Leyland Numbers 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 yzhs 🇩🇪 771 35 34ms 20 Aug 2020 561st ashtraypettingzoo 🇺🇸 771 35 33ms 17 Feb 2023 561st codereport 🇨🇦 771 35 34ms 1 Jun 2024 561st CaedenHarper 🇨🇦 771 35 47ms 2 hours ago 565th JayXon 🇺🇸 771 55 298ms 9 Jan 2022 565th MeWhenI 🇻🇦 771 55 38ms 16 Aug 2022 565th anter69 🇭🇺 771 55 36ms 25 Jan 2023 565th ovs-code 🇩🇪 771 55 34ms 22 Jan 2025 569th GrayJoKing 🇦🇺 771 73 5ms 16 Aug 2024 570th CaedenHarper 🇨🇦 771 77 1,318ms 9 Sep 2025 571st ovs-code 🇩🇪 771 155 259ms 21 Apr 2025 572nd CaedenHarper 🇨🇦 770 147 409ms 21 Oct 2025 573rd rucin93 🇵🇱 769 75 496ms 28 Nov 2025 574th LucaArgentiUCF 🇮🇹 769 112 41ms 14 Feb 2021 574th SirBogman 🇺🇸 769 112 39ms 4 Nov 2024 576th sean-niemann 🇺🇸 768 79 4ms 30 Oct 2022 576th lacrosse 768 79 80ms 27 Nov 2025 578th Yewzir 🇧🇪 768 162 2,962ms 3 Feb 2023 579th alemelis 767 56 467ms 12 Apr 2023 579th m-tkach 🇺🇦 767 56 470ms 24 May 2024 579th Lv0Sys 🇵🇱 767 56 1,186ms 3 Dec 2025 582nd emgordon154 766 194 306ms 18 Jan 2025 583rd rak1507 🇬🇧 765 79 10ms 31 Dec 2020 583rd hiddicop 🇸🇪 765 79 10ms 29 Jan 2021 583rd kops-cg 765 79 11ms 6 Apr 2021 583rd Frowny 765 79 10ms 11 Nov 2021 583rd janbehrens 🇩🇪 765 79 10ms 17 Jun 2023 583rd tobyLovick 765 79 10ms 26 Dec 2023 583rd NickTheEASDude 🇺🇸 765 79 10ms 29 Jan 2024 590th 5quiwyrm 762 74 285ms 9 Dec 2024 591st StarmaQ 762 99 2ms 22 Jan 2021 591st edsrzf 🇳🇿 762 99 2ms 30 May 2025 593rd lynn 762 126 188ms 19 May 2021 594th msbranicky 762 195 291ms 31 Aug 2023 595th tomtheisen 🇺🇸 761 88 9ms 3 Oct 2020 595th targrik 761 88 625ms 13 May 2025 597th DialFrost 🇸🇬 761 157 152ms 7 Nov 2025 598th DialFrost 🇸🇬 761 260 1,407ms 3 Mar 2025 599th snoozingnewt 🇨🇦 759 75 97ms 10 Feb 2026 600th kkoenig 758 196 308ms 7 Sep 2025 601st prplz 🇦🇺 757 56 67ms 28 Jul 2020 601st primo-ppcg 🇹🇭 757 56 145ms 15 Sep 2020 603rd TobyBoyne 🇬🇧 756 80 10ms 31 Dec 2020 603rd BrenSchaap 756 80 11ms 21 Oct 2021 603rd NicoAdams 756 80 10ms 1 Dec 2021 603rd Jacob385 756 80 4,239ms 14 Mar 2024 607th janbehrens 🇩🇪 755 93 5ms 29 Oct 2021 608th jared-hughes 754 165 2,969ms 24 Jun 2022 608th snyderek 🇺🇸 754 165 2,935ms 18 Dec 2024 610th JRaspass 🇬🇧 752 59 145ms 26 Jul 2020 611th ToriTheChicken 752 89 20ms 26 Jul 2020 611th thisishowmymindworks 🇳🇴 752 89 20ms 26 Jul 2020 611th prplz 🇦🇺 752 89 552ms 9 Oct 2021 614th anter69 🇭🇺 751 82 1,300ms 17 Sep 2024 614th Shanethegamer 🇺🇸 751 82 66ms 8 Dec 2024 614th edsrzf 🇳🇿 751 82 65ms 31 Jul 2025 617th edsrzf 🇳🇿 751 163 400ms 26 Sep 2025 617th CaedenHarper 🇨🇦 751 163 478ms 9 Oct 2025 619th saltysylvi 750 36 36ms 5 Aug 2022 620th Dazza314 🇬🇧 746 81 14ms 3 Nov 2020 620th AkashTandon167 746 81 10ms 15 Nov 2020 620th cbondurant 746 81 12ms 10 May 2021 620th knutae 🇳🇴 746 81 10ms 6 Dec 2021 620th CutSandstone 746 81 10ms 8 Jul 2024 620th Pyroan 746 81 9ms 13 May 2025 626th GrayJoKing 🇦🇺 746 156 40ms 4 Jan 2023 627th nwellnhof 🇩🇪 744 57 35ms 28 Oct 2021 627th GrayJoKing 🇦🇺 744 57 57ms 30 Nov 2023 627th DialFrost 🇸🇬 744 57 121ms 1 Jun 2024 630th emgordon154 744 90 11ms 1 Aug 2024 630th JOrE20 744 90 10ms 15 Feb 2026 632nd ovs-code 🇩🇪 743 104 10ms 11 Dec 2023 633rd jtaxen 742 92 117ms 19 Jun 2024 634th janbehrens 🇩🇪 741 58 463ms 1 Nov 2021 634th Shanethegamer 🇺🇸 741 58 616ms 17 Feb 2023 636th retrohun 740 82 2ms 9 Nov 2022 637th scpchicken 🇵🇼 739 60 138ms 2 Feb 2022 638th DialFrost 🇸🇬 738 153 219ms 6 Nov 2025 639th lukasthaler 737 82 12ms 11 Sep 2020 639th HumanEquivalentUnit 737 82 10ms 12 Oct 2020 First Prev 561–640 of 1,899 Next Last