The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Abundant Numbers (Long) in all languages in bytes. 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 Bytes Time Submitted 880th snoozingnewt 🇨🇦 871 64 512ms 28 Sep 2025 882nd Re-Adventures 🇮🇳 871 85 131ms 9 Jun 2023 882nd elgan65536 🇺🇸 871 85 133ms 24 Sep 2023 882nd drabart 🇵🇱 871 85 135ms 15 Dec 2023 882nd Aurel300 🇨🇭 871 85 128ms 6 Jun 2024 882nd wuzekai518 871 85 136ms 5 Aug 2024 882nd edsrzf 🇳🇿 871 85 133ms 16 Nov 2024 882nd luuumine 🇫🇷 871 85 129ms 18 Nov 2025 889th Lydxn 🇨🇦 871 92 44ms 11 Jul 2023 890th DestyNova 🇮🇪 870 71 129ms 24 Jan 2023 891st Shanethegamer 🇺🇸 870 89 461ms 19 Nov 2022 891st janbehrens 🇩🇪 870 89 438ms 19 Nov 2022 891st Ripick 870 89 471ms 27 Nov 2024 894th Sakisan 🇧🇪 869 72 2,800ms 21 Oct 2023 895th DialFrost 🇸🇬 869 141 1,427ms 28 Mar 2025 895th emgordon154 869 141 1,471ms 28 Mar 2025 895th Shanethegamer 🇺🇸 869 141 1,415ms 10 Apr 2025 898th KasperKivimaeki 🇫🇮 868 57 31ms 15 Dec 2025 899th HPWiz 🇳🇿 867 45 3,897ms 23 Nov 2022 899th o0lit3 🇺🇸 867 45 18ms 19 Jun 2023 899th nwellnhof 🇩🇪 867 45 795ms 27 Aug 2024 902nd DialFrost 🇸🇬 866 62 30ms 22 Dec 2023 902nd sean-niemann 🇺🇸 866 62 9ms 5 Feb 2025 902nd KasperKivimaeki 🇫🇮 866 62 15ms 10 Dec 2025 905th MeWhenI 🇻🇦 866 78 112ms 23 Nov 2022 905th Betuaredead 866 78 132ms 7 Jan 2023 905th raszpi 🇭🇺 866 78 117ms 2 Sep 2023 905th dokutan 866 78 119ms 8 Aug 2024 909th Shanethegamer 🇺🇸 865 57 12ms 19 Nov 2022 909th jared-hughes 865 57 15ms 19 Nov 2022 909th janbehrens 🇩🇪 865 57 13ms 19 Nov 2022 909th Re-Adventures 🇮🇳 865 57 11ms 20 Nov 2022 909th BambooleanLogic 🇸🇪 865 57 13ms 20 Nov 2022 909th GeorgeStechman 🇬🇧 865 57 13ms 20 Nov 2022 909th nstearns96 🇬🇧 865 57 13ms 28 Nov 2022 909th Yewzir 🇧🇪 865 57 12ms 16 Apr 2023 909th quirked-up 865 57 15ms 30 Aug 2023 909th raszpi 🇭🇺 865 57 12ms 2 Sep 2023 909th coreynash 865 57 13ms 25 Sep 2023 909th stefangimmillaro 865 57 11ms 28 Sep 2023 909th trinityy-7 865 57 17ms 18 Oct 2023 909th dylanarmstrong 865 57 13ms 6 Dec 2023 909th jbt 865 57 13ms 26 Dec 2023 909th olleicua 🇺🇸 865 57 13ms 2 Feb 2024 909th ovs-code 🇩🇪 865 57 147ms 4 Aug 2024 909th alexsave 865 57 11ms 6 Nov 2024 909th dokutan 865 57 16ms 16 Jul 2025 909th snoozingnewt 🇨🇦 865 57 14ms 9 Oct 2025 929th CatsAreFluffy 865 88 360ms 28 Nov 2022 929th bwat2 865 88 362ms 6 Apr 2023 929th Adix-null 🇱🇹 865 88 388ms 17 May 2023 929th Ripick 865 88 384ms 14 Jun 2025 929th qrakhen 865 88 432ms 1 Dec 2025 934th snoozingnewt 🇨🇦 865 116 276ms 19 Oct 2023 934th elgan65536 🇺🇸 865 116 283ms 23 Oct 2023 934th emgordon154 865 116 301ms 17 Jan 2025 934th Matter1024 🇮🇳 865 116 280ms 7 Aug 2025 938th EyalLitvin 864 69 20ms 20 Nov 2022 938th michelebastione 🇮🇹 864 69 50ms 21 Nov 2022 938th TheBlupper 864 69 22ms 22 Nov 2022 938th hymanimy 864 69 21ms 24 Nov 2022 938th knutae 🇳🇴 864 69 20ms 30 Nov 2022 938th fynnkroeger 864 69 30ms 10 Dec 2022 938th b10011 🇫🇮 864 69 21ms 18 Dec 2022 938th jmerle 🇳🇱 864 69 33ms 18 Dec 2022 938th grhkm21 864 69 21ms 20 Dec 2022 938th myleopard 864 69 21ms 22 Dec 2022 938th jumelet 🇳🇱 864 69 30ms 23 Dec 2022 938th badboj40 864 69 21ms 26 Dec 2022 938th PATTRIM 864 69 30ms 4 Jan 2023 938th 4ndyJ 🇬🇧 864 69 21ms 9 Jan 2023 938th m3nt0ras 🇬🇷 864 69 24ms 16 Feb 2023 938th marcin7Cd 864 69 21ms 24 Mar 2023 938th artieleach 864 69 21ms 15 Apr 2023 938th celiendonze 🇨🇭 864 69 21ms 17 Apr 2023 938th WillConker 864 69 31ms 15 Jul 2023 938th Mikey-Beep 🇬🇧 864 69 21ms 23 Aug 2023 938th cros107 🇦🇺 864 69 31ms 22 Oct 2023 938th Stockoh 🇫🇷 864 69 21ms 5 Nov 2023 938th rollershutter 864 69 26ms 13 Nov 2023 First Prev 881–960 of 2,764 Next Last