The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Day of Week 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 879th brochmann 🇸🇪 801 102 22ms 13 Aug 2023 879th sbatllori 801 102 24ms 25 Aug 2023 879th itsrenderman 801 102 23ms 30 Sep 2023 879th pde-bakk 🇳🇱 801 102 24ms 23 Oct 2023 879th ktanaka 801 102 14ms 11 Jan 2024 879th Krtecik 801 102 23ms 9 Feb 2024 879th qwjhvbxi 801 102 23ms 9 Feb 2024 879th pkilar43 801 102 23ms 9 Feb 2024 879th bwenstar 801 102 22ms 21 Feb 2024 879th sultan 801 102 24ms 26 Feb 2024 879th Trusly 801 102 23ms 27 Feb 2024 879th NoneTheFewer 801 102 21ms 17 May 2024 879th FranklinJiaChen 801 102 23ms 1 Jul 2024 879th lchaumartin 801 102 23ms 22 Aug 2024 879th alemelis 801 102 23ms 13 Sep 2024 879th ComputerKWasTaken 🇺🇸 801 102 21ms 24 Sep 2024 879th xyangst 801 102 14ms 3 Oct 2024 879th JunkIce 801 102 21ms 4 Oct 2024 879th wh3n3v3r 🇨🇿 801 102 23ms 20 Nov 2024 879th codewrite 🇬🇧 801 102 22ms 19 Apr 2025 879th kistlerf 🇨🇭 801 102 23ms 14 May 2025 879th ffelixm 801 102 23ms 1 Jun 2025 879th Andrey2001 801 102 37ms 26 Nov 2025 904th lifthrasiir 🇰🇷 801 264 34ms 19 Dec 2024 905th greenstuartj 800 20 317ms 4 Jan 2024 906th primo-ppcg 🇹🇭 800 308 15ms 2 Aug 2023 907th DialFrost 🇸🇬 799 91 188ms 3 Jun 2025 908th GolfingSuccess 🇬🇷 799 336 1,452ms 4 Feb 2025 908th ovs-code 🇩🇪 799 336 1,484ms 24 Feb 2026 910th emgordon154 798 154 603ms 25 May 2025 911th DialFrost 🇸🇬 797 85 1,391ms 14 Feb 2026 912th Steffan153 🇫🇮 797 96 81ms 18 Apr 2023 912th lynn 797 96 83ms 16 Oct 2023 914th GolfingSuccess 🇬🇷 796 201 806ms 25 days ago 915th ShepardToTheStars 795 74 371ms 4 Jan 2024 915th KatieLG 🇬🇧 795 74 368ms 30 Apr 2024 915th codewrite 🇬🇧 795 74 377ms 19 Apr 2025 918th fuzzylojik-golf 🇺🇸 794 68 2,631ms 31 Dec 2025 919th edsrzf 🇳🇿 794 175 13ms 18 days ago 920th kg583 🇺🇸 794 195 39ms 24 Jun 2025 921st MichalMarsalek 🇨🇿 793 103 14ms 16 Apr 2023 921st adamnielson42 🇺🇸 793 103 20ms 4 May 2023 921st NickTheEASDude 🇺🇸 793 103 14ms 29 Jan 2024 921st CutSandstone 793 103 14ms 4 Jul 2024 921st NanduBC 793 103 23ms 3 Sep 2024 921st FEZfan 🇦🇺 793 103 25ms 18 Apr 2025 921st RaBa21 🇭🇺 793 103 15ms 19 Jul 2025 921st TheZwierzLF 🇵🇱 793 103 15ms 21 Nov 2025 929th Steffan153 🇫🇮 792 76 17ms 16 Apr 2023 929th GrayJoKing 🇦🇺 792 76 16ms 17 Apr 2023 929th Lydxn 🇨🇦 792 76 17ms 26 May 2023 929th ovs-code 🇩🇪 792 76 17ms 2 Jul 2024 933rd epic-programmer-guy 792 94 389ms 15 Apr 2024 934th Steffan153 🇫🇮 790 153 254ms 28 Apr 2023 935th MeWhenI 🇻🇦 790 245 4ms 15 Sep 2024 936th SirBogman 🇺🇸 789 215 41ms 3 Jun 2025 937th TinyPandas 788 106 4ms 12 Sep 2023 937th TheLastZombie 788 106 3ms 15 May 2024 939th commandz0 🇺🇸 788 137 159ms 3 Aug 2023 940th MeWhenI 🇻🇦 788 158 773ms 20 Aug 2023 940th sean-niemann 🇺🇸 788 158 859ms 22 Aug 2024 940th Steffan153 🇫🇮 788 158 764ms 22 Aug 2024 943rd blaztoma 🇱🇹 786 48 39ms 19 Oct 2025 943rd beirigo 🇧🇷 786 48 37ms 30 Oct 2025 945th OllieBoyne 🇬🇧 786 104 23ms 17 Apr 2023 945th Eilonlif 🇮🇱 786 104 22ms 17 Apr 2023 945th Ripick 786 104 24ms 12 May 2023 945th eddvrs 786 104 23ms 18 May 2023 945th fbe 786 104 23ms 26 May 2023 945th Wildst 786 104 15ms 6 Jul 2023 945th cefqrn 786 104 27ms 1 Nov 2023 945th bsoyka 🇺🇸 786 104 23ms 25 Nov 2023 945th neihousaigaai 786 104 23ms 11 Feb 2024 945th wilhelmines 786 104 15ms 1 Jun 2024 945th jiaminglimjm 🇲🇾 786 104 21ms 5 Jul 2024 945th JesseNoEyes 🇺🇸 786 104 15ms 18 Sep 2024 945th Rago-Tony 786 104 23ms 11 Jul 2025 958th retrohun 785 104 179ms 16 Jun 2024 959th kxwish 🇨🇦 784 86 54ms 12 Sep 2023 959th Maximizer02 784 86 55ms 17 Sep 2025 First Prev 881–960 of 1,510 Next Last