The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Abundant 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 641st ScottHamper 821 88 501ms 30 Nov 2025 642nd btnlq 821 91 1ms 7 Nov 2020 643rd GrayJoKing 🇦🇺 820 67 2ms 21 Dec 2021 643rd ovs-code 🇩🇪 820 67 1,774ms 24 Nov 2023 645th DialFrost 🇸🇬 819 55 417ms 17 Jan 2024 645th neel11235813 819 55 353ms 1 Apr 2024 645th ovs-code 🇩🇪 819 55 531ms 10 Feb 2025 648th seanleken 819 57 9ms 22 Nov 2019 648th rambox11 819 57 9ms 24 Nov 2019 648th elisherer 🇮🇱 819 57 10ms 3 Jan 2020 648th NatNgs 819 57 8ms 8 Jan 2020 648th cywong-amino 🇭🇰 819 57 10ms 19 May 2020 648th daisy-lau 819 57 10ms 29 May 2020 648th pomber 819 57 9ms 8 Jul 2020 648th ToriTheChicken 819 57 8ms 24 Jul 2020 648th itiievskyi 🇺🇦 819 57 10ms 7 Aug 2020 648th janbehrens 🇩🇪 819 57 9ms 18 Sep 2020 648th Re-Adventures 🇮🇳 819 57 9ms 23 Jan 2021 648th neihousaigaai 819 57 9ms 8 May 2021 648th Darrennchan8 819 57 10ms 26 Jul 2021 648th olivermrose 🇺🇸 819 57 10ms 29 Aug 2021 648th vang1ong7ang 819 57 9ms 29 Oct 2021 648th BambooleanLogic 🇸🇪 819 57 11ms 3 Dec 2021 648th Giga-Bowser 819 57 13ms 14 Dec 2021 648th uttumuttu 🇫🇮 819 57 9ms 4 Jan 2022 648th FlorianGoeth 819 57 10ms 15 Mar 2022 648th fitzdotlol 🇺🇸 819 57 10ms 22 Mar 2022 648th Shanethegamer 🇺🇸 819 57 10ms 28 Apr 2022 648th GeorgeStechman 🇬🇧 819 57 11ms 23 May 2022 648th coreynash 819 57 10ms 4 Nov 2022 648th nstearns96 🇬🇧 819 57 9ms 28 Nov 2022 648th GreenBeansAgainstVeganism 819 57 9ms 14 Jan 2023 648th Yewzir 🇧🇪 819 57 11ms 16 Apr 2023 648th ShiraJoseph 🇺🇸 819 57 12ms 21 Jul 2023 648th raszpi 🇭🇺 819 57 9ms 2 Sep 2023 648th stefangimmillaro 819 57 9ms 28 Sep 2023 648th Davr1 🇨🇿 819 57 10ms 15 Oct 2023 648th trinityy-7 819 57 13ms 18 Oct 2023 648th dylanarmstrong 819 57 10ms 6 Dec 2023 648th jbt 819 57 10ms 24 Dec 2023 648th kordrun 819 57 10ms 3 Apr 2024 648th ErikGXDev 819 57 11ms 26 Oct 2024 648th alexsave 819 57 11ms 6 Nov 2024 648th Andrey-Plotnikov 819 57 10ms 21 Jun 2025 648th dokutan 819 57 9ms 16 Jul 2025 648th snoozingnewt 🇨🇦 819 57 10ms 9 Oct 2025 648th levinwinter 819 57 10ms 31 Oct 2025 648th Lv0Sys 🇵🇱 819 57 13ms 3 Dec 2025 689th emgordon154 818 54 150ms 15 Nov 2024 690th mattiapenati 818 81 129ms 28 Nov 2020 690th Shanethegamer 🇺🇸 818 81 122ms 13 Mar 2023 690th emgordon154 818 81 125ms 19 Feb 2025 690th DialFrost 🇸🇬 818 81 128ms 5 Apr 2025 690th fuzzylojik-golf 🇺🇸 818 81 126ms 3 Sep 2025 690th pardouin 🇫🇷 818 81 128ms 19 Sep 2025 696th vezzick 817 59 11ms 8 Mar 2021 696th schachmattmatt 817 59 10ms 16 Aug 2021 696th annaproxy 817 59 10ms 31 Oct 2021 696th Anonymousellama21 817 59 9ms 30 Nov 2021 696th jmerle 🇳🇱 817 59 12ms 21 Jan 2022 696th fredrik-bakke 🇳🇴 817 59 10ms 2 Oct 2022 696th firegene 🇮🇪 817 59 11ms 4 Jan 2023 696th Alex-x90 🇺🇸 817 59 10ms 20 Jan 2023 696th bzijlema 🇳🇱 817 59 10ms 24 Sep 2023 696th FCORMERAIS 817 59 10ms 5 Mar 2024 696th FranklinJiaChen 817 59 10ms 13 Jun 2024 696th jatloe 817 59 11ms 24 Aug 2024 696th HumanoidCPU 817 59 12ms 9 Sep 2024 696th JunkIce 817 59 11ms 24 Nov 2024 696th lelbal 817 59 10ms 23 Jun 2025 696th LordSir101 817 59 18ms 1 Aug 2025 696th Babafaba 817 59 10ms 7 Sep 2025 696th luuumine 🇫🇷 817 59 11ms 7 Nov 2025 696th Trildcookie 817 59 19ms 22 Dec 2025 715th MeWhenI 🇻🇦 816 60 2ms 13 Nov 2022 716th lynn 813 31 33ms 8 Apr 2021 716th rak1507 🇬🇧 813 31 36ms 18 Oct 2021 718th GrayJoKing 🇦🇺 813 90 447ms 14 Mar 2022 718th snyderek 🇺🇸 813 90 58ms 21 Sep 2024 720th MeWhenI 🇻🇦 813 194 1,169ms 19 Apr 2025 First Prev 641–720 of 4,397 Next Last