The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 144th sbatllori 949 71 55ms 25 Aug 2023 144th coreynash 949 71 60ms 19 Sep 2023 144th ovs-code 🇩🇪 949 71 56ms 29 Sep 2023 144th Davr1 🇨🇿 949 71 58ms 15 Oct 2023 144th sisyphus-ppcg 🇦🇺 949 71 62ms 1 Nov 2023 144th lukegustafson 🇺🇸 949 71 51ms 22 Nov 2023 144th chartung17 949 71 50ms 10 Dec 2023 144th danielphilpottwork 949 71 55ms 20 Dec 2023 144th keizure 🇨🇳 949 71 58ms 12 Jan 2024 144th olleicua 🇺🇸 949 71 57ms 13 Jan 2024 144th weliveinhell 🇭🇹 949 71 58ms 21 Jan 2024 144th two-bad 🇬🇧 949 71 50ms 3 Feb 2024 144th xsot 🇸🇬 949 71 51ms 3 Feb 2024 144th voytxt 🇨🇿 949 71 53ms 4 Feb 2024 144th helbling 🇨🇭 949 71 50ms 27 Feb 2024 144th mamamia5x 949 71 51ms 8 Mar 2024 144th aopedal 949 71 49ms 14 Mar 2024 144th unfinishedprogram 949 71 51ms 3 May 2024 144th junkondo-jp 949 71 50ms 5 May 2024 144th TheLastZombie 949 71 55ms 15 May 2024 144th FlorianCassayre 🇫🇷 949 71 52ms 20 May 2024 144th KatieLG 🇬🇧 949 71 54ms 9 Jun 2024 144th vlpx 🇫🇮 949 71 54ms 18 Jun 2024 144th pardouin 🇫🇷 949 71 57ms 24 Jul 2024 144th GrayJoKing 🇦🇺 949 71 54ms 12 Aug 2024 144th kpal81xd 949 71 57ms 1 Sep 2024 144th edsrzf 🇳🇿 949 71 53ms 21 Sep 2024 144th xyangst 949 71 54ms 23 Sep 2024 144th b-illy 🇬🇧 949 71 54ms 29 Sep 2024 144th duckyluuk 🇳🇱 949 71 52ms 3 Oct 2024 144th Andrey-Plotnikov 949 71 50ms 10 Nov 2024 144th CaedenHarper 🇨🇦 949 71 64ms 19 Nov 2024 144th SiddharthShyniben 949 71 51ms 1 Dec 2024 144th targrik 949 71 51ms 5 Feb 2025 144th qpwoeirut 949 71 54ms 7 Feb 2025 144th kirjavascript 949 71 59ms 13 Feb 2025 144th MeWhenI 🇻🇦 949 71 51ms 13 Mar 2025 144th fuzzylojik-golf 🇺🇸 949 71 57ms 29 May 2025 144th JOrE20 949 71 53ms 15 Nov 2025 144th snoozingnewt 🇨🇦 949 71 54ms 7 Dec 2025 144th CornerMercury 🇬🇧 949 71 55ms 7 Dec 2025 144th Lv0Sys 🇵🇱 949 71 53ms 8 Dec 2025 144th DialFrost 🇸🇬 949 71 51ms 14 Dec 2025 144th iamsterdam800 949 71 51ms 1 Feb 2026 144th Natanaelel 🇸🇪 949 71 50ms 3 days ago 144th smclaughlin-cf 949 71 48ms 46 hours ago 207th Steffan153 🇫🇮 943 40 34ms 25 Dec 2023 207th janlelis 943 40 37ms 25 Dec 2023 207th JayXon 🇺🇸 943 40 37ms 25 Dec 2023 207th ovs-code 🇩🇪 943 40 37ms 25 Dec 2023 207th Lydxn 🇨🇦 943 40 39ms 29 Dec 2023 207th 4hg 🇺🇸 943 40 36ms 8 Jan 2024 207th xsot 🇸🇬 943 40 37ms 31 Jan 2024 207th sisyphus-ppcg 🇦🇺 943 40 37ms 29 Apr 2024 207th radarek 🇵🇱 943 40 41ms 7 Jul 2024 207th nwellnhof 🇩🇪 943 40 40ms 24 Sep 2024 207th sean-niemann 🇺🇸 943 40 38ms 20 Dec 2024 207th stefangimmillaro 943 40 39ms 23 May 2025 207th pardouin 🇫🇷 943 40 37ms 1 Sep 2025 207th D-MOVE 🇵🇭 943 40 40ms 8 Dec 2025 207th denkyuu1 943 40 38ms 5 Feb 2026 207th Natanaelel 🇸🇪 943 40 41ms 6 days ago 223rd jmerle 🇳🇱 941 17 242ms 15 Jun 2023 223rd Yewzir 🇧🇪 941 17 240ms 9 Apr 2024 223rd xyangst 941 17 258ms 15 Oct 2024 223rd ZakkkkAttackkkk 🇵🇭 941 17 278ms 25 Feb 2025 223rd blaztoma 🇱🇹 941 17 245ms 19 Oct 2025 223rd Emutis 🇱🇹 941 17 285ms 19 Oct 2025 223rd CrookedJ 941 17 227ms 2 Dec 2025 230th yzhs 🇩🇪 939 87 14ms 22 Jun 2023 230th NewDefectus 🇮🇱 939 87 14ms 19 Aug 2023 230th Emutis 🇱🇹 939 87 15ms 7 Dec 2025 233rd Shanethegamer 🇺🇸 936 72 52ms 26 May 2023 233rd jared-hughes 936 72 52ms 28 Jul 2023 233rd iczelia 🇩🇪 936 72 55ms 16 Jan 2026 236th btnlq 934 63 445ms 17 Apr 2023 236th JayXon 🇺🇸 934 63 464ms 18 Apr 2023 236th nwellnhof 🇩🇪 934 63 406ms 19 Apr 2023 236th primo-ppcg 🇹🇭 934 63 414ms 21 Apr 2023 236th Yewzir 🇧🇪 934 63 416ms 9 May 2023 First Prev 161–240 of 1,511 Next Last