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 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 239th JayXon 🇺🇸 924 66 395ms 21 Jan 2024 239th kg583 🇺🇸 924 66 474ms 20 Feb 2024 239th xsot 🇸🇬 924 66 403ms 14 May 2024 239th pardouin 🇫🇷 924 66 416ms 11 Jul 2024 239th MeWhenI 🇻🇦 924 66 465ms 13 Jul 2024 239th sean-niemann 🇺🇸 924 66 480ms 27 Jul 2024 239th b-illy 🇬🇧 924 66 417ms 7 Sep 2024 239th CaedenHarper 🇨🇦 924 66 451ms 19 Sep 2024 239th emgordon154 924 66 415ms 21 Oct 2024 239th lifthrasiir 🇰🇷 924 66 389ms 2 Dec 2024 239th GolfingSuccess 🇬🇷 924 66 470ms 18 Feb 2025 239th fuzzylojik-golf 🇺🇸 924 66 438ms 7 Sep 2025 239th CornerMercury 🇬🇧 924 66 400ms 17 Dec 2025 254th ovs-code 🇩🇪 923 38 76ms 16 Apr 2023 254th Steffan153 🇫🇮 923 38 79ms 16 Apr 2023 254th Lydxn 🇨🇦 923 38 78ms 17 Apr 2023 254th sean-niemann 🇺🇸 923 38 83ms 17 Apr 2023 254th Alessandro-Balconi 🇮🇹 923 38 76ms 18 Apr 2023 254th sisyphus-ppcg 🇦🇺 923 38 86ms 21 Apr 2023 254th DialFrost 🇸🇬 923 38 77ms 20 Oct 2023 254th snoozingnewt 🇨🇦 923 38 77ms 21 Oct 2023 254th uttumuttu 🇫🇮 923 38 77ms 22 Dec 2023 254th rboath 923 38 77ms 11 Dec 2024 254th adgh 🇬🇧 923 38 81ms 11 Dec 2024 254th EthanSansom 923 38 77ms 17 Oct 2025 266th klixel 🇨🇦 923 71 15ms 16 May 2023 266th yzhs 🇩🇪 923 71 14ms 22 Jun 2023 266th anter69 🇭🇺 923 71 23ms 15 Mar 2024 266th RJFuller 923 71 36ms 19 Mar 2024 266th neel11235813 923 71 14ms 28 Mar 2024 266th leon-w 923 71 14ms 24 Jul 2024 266th plcc0 923 71 14ms 9 Mar 2025 266th albanian-laundromat 923 71 14ms 28 Jun 2025 266th luuumine 🇫🇷 923 71 26ms 25 Nov 2025 266th JOrE20 923 71 14ms 26 days ago 276th rifatx 919 64 420ms 9 Jul 2024 277th edsrzf 🇳🇿 919 80 525ms 24 Sep 2025 277th sean-niemann 🇺🇸 919 80 383ms 24 Sep 2025 277th JayXon 🇺🇸 919 80 490ms 24 Sep 2025 277th nwellnhof 🇩🇪 919 80 490ms 25 Sep 2025 277th namelessiw 919 80 408ms 2 Oct 2025 277th DialFrost 🇸🇬 919 80 493ms 2 Oct 2025 277th Yewzir 🇧🇪 919 80 417ms 2 Oct 2025 277th Yax42 🇫🇷 919 80 525ms 4 Oct 2025 277th stefangimmillaro 919 80 605ms 6 Oct 2025 277th EvilFonti 919 80 400ms 18 Nov 2025 277th h3ra993huskp 🇯🇵 919 80 508ms 30 Nov 2025 277th ScottHamper 919 80 525ms 30 Nov 2025 277th snoozingnewt 🇨🇦 919 80 590ms 14 Dec 2025 277th fuzzylojik-golf 🇺🇸 919 80 506ms 31 Dec 2025 277th Steffan153 🇫🇮 919 80 378ms 11 Feb 2026 292nd Alex-x90 🇺🇸 917 93 2ms 16 Apr 2023 292nd nwellnhof 🇩🇪 917 93 2ms 17 Apr 2023 292nd inventshah 917 93 2ms 13 May 2023 292nd Lydxn 🇨🇦 917 93 2ms 13 May 2023 292nd JayXon 🇺🇸 917 93 2ms 14 May 2023 292nd ovs-code 🇩🇪 917 93 2ms 24 Aug 2023 292nd rhdqor213 917 93 2ms 18 Sep 2023 292nd JohandeRuiter 🇳🇱 917 93 2ms 28 Nov 2023 292nd KasperKivimaeki 🇫🇮 917 93 3ms 21 Dec 2023 292nd Steffan153 🇫🇮 917 93 2ms 10 Aug 2024 292nd xsot 🇸🇬 917 93 2ms 10 Aug 2024 292nd sean-niemann 🇺🇸 917 93 2ms 10 Aug 2024 304th canissimia 🇦🇶 916 44 2ms 7 Jan 2026 305th itsh01 911 74 49ms 8 Aug 2023 305th apokryfos 911 74 52ms 21 Aug 2023 305th predyy 911 74 53ms 25 Aug 2023 305th rgthree 911 74 59ms 6 Sep 2023 305th Florian-Mt 911 74 51ms 24 Sep 2023 305th iCyuba 911 74 48ms 25 Oct 2023 305th erikgaal 911 74 47ms 5 Jan 2024 305th thisishowmymindworks 🇳🇴 911 74 54ms 14 Jun 2024 305th dokutan 911 74 52ms 4 Aug 2024 305th Salutations45 911 74 54ms 13 Nov 2024 305th dylanarmstrong 911 74 52ms 19 Dec 2024 305th emgordon154 911 74 51ms 8 May 2025 305th cloudyshoe 911 74 52ms 18 May 2025 305th avavuvu 911 74 54ms 19 Jun 2025 305th randomuser1312 🇨🇭 911 74 53ms 30 Oct 2025 305th KasperKivimaeki 🇫🇮 911 74 57ms 1 Nov 2025 First Prev 241–320 of 1,507 Next Last