The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Leap Years 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 628th orthizar 705 61 9ms 8 Jul 2022 628th bwenstar 705 61 10ms 11 Aug 2022 628th murugan-k-0204 705 61 10ms 5 Oct 2022 628th za3k 705 61 9ms 8 Oct 2022 628th Anthony-Williams-06 705 61 32ms 1 Dec 2022 628th StronkCheese 🇺🇸 705 61 9ms 27 Jan 2023 628th Sora1248 🇩🇪 705 61 10ms 23 Feb 2023 628th midnattssol 🇸🇪 705 61 10ms 22 Sep 2023 628th PrathamMehta08 705 61 13ms 6 Dec 2023 628th anarconic 705 61 17ms 8 Dec 2023 628th brimstonetrader 705 61 16ms 20 Dec 2023 628th qwjhvbxi 705 61 10ms 9 Feb 2024 628th Alex-Huggett 🇬🇧 705 61 24ms 13 Apr 2024 628th ceeb9 705 61 10ms 20 May 2024 628th AdamMorris377 705 61 16ms 31 Jul 2024 628th tperr 705 61 10ms 29 Sep 2024 628th Europe2048 705 61 10ms 18 Oct 2024 628th jastrzumb 705 61 17ms 4 Jan 2025 659th jarrodcolburn 694 62 10ms 17 Jan 2019 659th nkansal96 694 62 13ms 21 May 2019 659th Oscujic 694 62 10ms 11 Nov 2019 659th scrappedsoda 694 62 9ms 28 Nov 2019 659th david-wiles6 694 62 9ms 22 Jan 2020 659th theonlytruemathnerd 694 62 9ms 2 Feb 2020 659th robertDurst 694 62 16ms 25 Feb 2020 659th reedwilemon 694 62 9ms 4 Jun 2020 659th hjcafaroUC 694 62 9ms 28 Jul 2020 659th Dazza314 🇬🇧 694 62 9ms 1 Nov 2020 659th GnotAGnelf 694 62 10ms 24 Nov 2020 659th Timevdo 694 62 17ms 9 Mar 2021 659th AIn0n 694 62 10ms 19 Aug 2021 659th MLPdiscord 694 62 10ms 6 Jan 2022 659th AdamHe17 694 62 16ms 31 May 2022 659th r-benson 🇬🇧 694 62 15ms 1 Feb 2023 659th PotatoSaladOverlord 694 62 10ms 14 Mar 2023 659th lomarbrick 694 62 10ms 17 May 2023 659th YoungjuneKwon 694 62 9ms 13 Jul 2023 659th Eugen-str 694 62 10ms 1 Nov 2023 659th Zach10za 694 62 16ms 23 Jan 2024 659th ArenaGrenade 694 62 17ms 19 Feb 2024 659th profJGermain 694 62 10ms 8 Mar 2024 659th Puperger 694 62 16ms 20 Jun 2024 659th Loag 694 62 9ms 7 Sep 2024 659th ziselsberger 694 62 11ms 8 Oct 2024 659th lhulinsky 694 62 9ms 21 Oct 2024 659th Artemis21 🇬🇧 694 62 16ms 24 Jan 2025 659th WillowWispy 694 62 10ms 17 Mar 2025 659th j-zhang43 694 62 17ms 16 Nov 2025 659th Matter1024 🇮🇳 694 62 17ms 16 Dec 2025 690th omgardner 683 63 9ms 25 Apr 2019 690th DrKristoff 683 63 11ms 22 May 2019 690th dcure73 683 63 10ms 7 Jun 2019 690th adesanjo 683 63 16ms 8 Jun 2019 690th chris-robo 683 63 9ms 8 Apr 2020 690th richard-oelze 🇩🇪 683 63 9ms 16 Nov 2020 690th Miles-1000 🇬🇧 683 63 23ms 14 Mar 2021 690th bbakersmith 683 63 16ms 25 Jul 2021 690th constant-stranger 683 63 12ms 9 Feb 2022 690th Eilonlif 🇮🇱 683 63 16ms 21 Sep 2022 690th badboj40 683 63 16ms 27 Dec 2022 690th hm5822 683 63 17ms 22 Apr 2023 690th Legiatron 683 63 13ms 28 Apr 2023 690th salvatore-abello 683 63 10ms 5 Sep 2024 690th Shorter-Than-Short 683 63 18ms 18 Nov 2024 690th croc54 683 63 10ms 11 Jan 2025 690th psaban 683 63 10ms 12 Jan 2025 690th taesungh 683 63 17ms 7 Jun 2025 690th Hyperoplex145 683 63 10ms 3 Dec 2025 709th NoliHyd 672 64 15ms 27 Feb 2019 709th oparisblue 672 64 9ms 24 Mar 2019 709th zdzc 672 64 16ms 23 Apr 2019 709th rgskinnerhpe 672 64 9ms 18 Jun 2019 709th KiwiKoder0123 672 64 10ms 23 Jun 2019 709th kenballus 672 64 16ms 13 Nov 2019 709th anominos 672 64 17ms 12 Dec 2019 709th ADV1K 🇮🇳 672 64 16ms 20 Feb 2020 709th j21marshall 672 64 32ms 7 Aug 2020 709th JeromeSchweitzer 672 64 17ms 7 Sep 2020 709th garrisonhh 672 64 10ms 20 Nov 2020 709th Pena86 672 64 9ms 19 Feb 2021 First Prev 641–720 of 1,122 Next Last
