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?
Ordinal Numbers in Python 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 229th Terobero 631 103 20ms 4 Sep 2024 229th Aquateraneal 🇺🇸 631 103 12ms 19 Feb 2026 243rd rschwa6308 🇺🇸 625 104 13ms 16 Jul 2019 243rd cellobix 625 104 19ms 13 Aug 2019 243rd stordev 625 104 13ms 26 Feb 2021 243rd cubed-guy 625 104 20ms 13 Feb 2022 243rd TaserTheFox 🇺🇸 625 104 20ms 18 Apr 2023 243rd cros107 🇦🇺 625 104 12ms 17 Jun 2023 243rd Europe2048 625 104 19ms 11 days ago 250th giacomogallina 619 105 16ms 4 Oct 2019 250th SupImDos 619 105 13ms 26 Jun 2020 250th PiterAnnema 619 105 13ms 29 Aug 2020 250th Stockoh 🇫🇷 619 105 13ms 17 Dec 2021 250th Anonymousellama21 619 105 13ms 15 Jun 2022 250th GulgDev 619 105 17ms 21 Mar 2023 250th jtaxen 619 105 19ms 22 Jun 2023 250th tnecio 619 105 14ms 18 Jun 2024 250th codingisgreatbutiamnot 619 105 19ms 27 Jul 2024 250th starfihs 619 105 13ms 21 Sep 2024 250th SoliGhost 619 105 13ms 11 Jun 2025 261st Starwort 🇬🇧 613 106 19ms 14 Aug 2019 261st sambirnbaum1 613 106 13ms 13 Oct 2019 261st derekthatcher 613 106 12ms 22 Sep 2020 261st tpaxman 🇨🇦 613 106 12ms 10 Dec 2020 261st lmolteno 613 106 13ms 9 Mar 2021 261st chartung17 613 106 13ms 1 Jan 2024 261st inverseLorentz 🇦🇺 613 106 12ms 22 May 2024 261st Rubiksmath 613 106 13ms 29 Sep 2024 261st tomh1012 613 106 19ms 25 Feb 2026 270th danielwang5 607 107 19ms 1 Aug 2020 270th markusgraube 607 107 12ms 11 Apr 2023 270th BREMAUCY 🇫🇷 607 107 13ms 25 May 2023 270th midnattssol 🇸🇪 607 107 12ms 27 Jul 2023 274th adoxography 602 108 13ms 16 Sep 2019 274th kbeat 🇰🇿 602 108 19ms 5 Jun 2025 276th vonKrafft 596 109 12ms 24 Mar 2020 276th geofft 596 109 12ms 11 Dec 2020 276th cbondurant 596 109 19ms 5 May 2021 276th j-Ewan 596 109 21ms 2 Mar 2022 276th nstearns96 🇬🇧 596 109 20ms 29 Nov 2022 276th jipsong 🇩🇪 596 109 17ms 22 Jun 2025 282nd SpeedyNinja 591 110 20ms 21 Oct 2020 282nd zbreit 🇺🇸 591 110 20ms 16 Aug 2021 282nd PhysicDev 🇫🇷 591 110 12ms 17 Mar 2022 282nd jettdc 591 110 12ms 4 Dec 2022 282nd MichalMarsalek 🇨🇿 591 110 13ms 31 Jan 2023 282nd RedzGoose 🇦🇺 591 110 13ms 18 Oct 2024 282nd mishak-sys 591 110 19ms 24 Feb 2025 289th TobyBoyne 🇬🇧 586 111 13ms 1 Aug 2019 289th doug-h 586 111 12ms 29 May 2020 289th suwat513 586 111 12ms 20 Sep 2022 289th eiburns 586 111 13ms 21 Jan 2023 289th Vaekor 586 111 13ms 9 Jul 2023 289th Mikey-Beep 🇬🇧 586 111 12ms 24 Aug 2023 289th PyryL 🇫🇮 586 111 12ms 26 Aug 2024 289th SectorCorruptor 586 111 13ms 8 Feb 2026 297th richard-oelze 🇩🇪 580 112 19ms 17 Jan 2021 297th martinnorling 🇸🇪 580 112 19ms 9 Mar 2022 297th ImpressedByRocks 580 112 33ms 11 Mar 2025 297th ffelixm 580 112 20ms 27 May 2025 297th TheZwierzLF 🇵🇱 580 112 13ms 8 Dec 2025 302nd jotslo 🇬🇧 575 113 12ms 12 Jul 2019 302nd anominos 575 113 19ms 14 Dec 2019 302nd bastienvoirin 🇫🇷 575 113 19ms 8 Apr 2020 302nd dpasionek 575 113 20ms 2 Oct 2020 302nd Y0UR-U5ERNAME 575 113 19ms 5 Sep 2021 302nd maddenfederico 575 113 12ms 29 Jan 2022 302nd mbittner20 575 113 12ms 27 May 2023 302nd Emutis 🇱🇹 575 113 12ms 10 Oct 2024 302nd bpharaldsson 575 113 19ms 6 Feb 2026 311th kinoute 🇫🇷 570 114 18ms 12 Sep 2021 311th BrenSchaap 570 114 14ms 21 Oct 2021 311th wirewolf010 570 114 13ms 4 Jan 2022 311th rollershutter 570 114 19ms 23 Jun 2023 315th ay2718 565 115 19ms 12 Aug 2019 315th pascscha 565 115 19ms 28 Mar 2022 315th Zach10za 565 115 20ms 17 Nov 2022 315th mothcolada 🇺🇸 565 115 22ms 5 Jul 2025 319th ydevor 🇮🇱 560 116 14ms 30 Nov 2020 319th vhoulbreque 🇫🇷 560 116 13ms 20 Aug 2022 First Prev 241–320 of 473 Next Last
