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?
Happy 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 399th martinnorling 🇸🇪 475 101 23ms 2 Feb 2022 399th Stockoh 🇫🇷 475 101 20ms 26 Apr 2024 403rd michael-celani 471 102 12ms 30 Dec 2017 403rd knutae 🇳🇴 471 102 18ms 6 Dec 2021 403rd za3k 471 102 10ms 9 Oct 2022 403rd CatsAreFluffy 471 102 10ms 12 Dec 2022 407th jhunterkohler 466 103 17ms 20 May 2021 407th rollsroyce0 466 103 16ms 8 Jul 2025 409th PFischbeck 462 104 17ms 2 Jan 2018 409th fynnkroeger 462 104 17ms 8 Feb 2021 409th feherd 462 104 15ms 30 Aug 2021 409th amollberg 🇸🇪 462 104 18ms 29 Jan 2022 409th MarioPlq 462 104 12ms 24 Jun 2022 409th no53488 462 104 10ms 5 Dec 2022 409th Wildst 462 104 10ms 7 Jul 2023 416th lrustand 457 105 11ms 15 Jan 2018 416th djtuBIG-MaliceX 457 105 17ms 30 Jan 2018 416th Faweks1 457 105 16ms 1 Aug 2018 416th SupImDos 457 105 9ms 10 Nov 2020 416th dillon-duncando 457 105 18ms 1 Dec 2021 416th Ch3ngL0rd 457 105 12ms 16 Jan 2024 416th jamesthekee 457 105 11ms 25 Jan 2025 416th kistlerf 🇨🇭 457 105 16ms 16 May 2025 424th dave-ck 453 106 10ms 3 Mar 2018 424th RyanCarrusca 453 106 10ms 21 Feb 2019 424th oriphi 453 106 56ms 17 Jun 2019 424th evanrittner 453 106 16ms 12 Jan 2020 424th oAsAo 453 106 30ms 21 Jan 2020 424th hymanimy 453 106 17ms 11 Aug 2021 424th eshilo-draper 453 106 16ms 18 Nov 2022 424th ZoeMcG 453 106 10ms 8 Jan 2023 424th mathisfun271 453 106 92ms 13 Feb 2024 424th Ythaenagor 453 106 17ms 5 Aug 2024 434th stordev 449 107 16ms 26 Feb 2021 434th KrausRaus 🇺🇸 449 107 10ms 15 Apr 2021 434th petroselo 449 107 17ms 29 Dec 2021 434th jumelet 🇳🇱 449 107 17ms 13 Dec 2022 434th jameswmccarty 449 107 17ms 11 Jul 2024 434th PyryL 🇫🇮 449 107 19ms 15 Mar 2025 434th kbeat 🇰🇿 449 107 17ms 21 May 2025 441st 05st 444 108 16ms 14 Feb 2022 441st CameronGBell 444 108 10ms 7 Mar 2022 441st SniperSmiley 🇺🇸 444 108 16ms 29 Jun 2022 441st dtaylor0 444 108 17ms 25 Dec 2022 441st ridingqwerty 🇺🇸 444 108 18ms 30 Nov 2023 441st sultan 444 108 10ms 2 Apr 2024 441st jfallon1997 444 108 18ms 16 May 2024 441st 40fied4t 444 108 9ms 21 May 2025 449th tkwa 440 109 17ms 5 Dec 2018 449th Bodo171 440 109 15ms 24 Nov 2022 449th DaCuteRaccoon 440 109 10ms 30 Nov 2022 449th jagannathhari 440 109 17ms 21 Oct 2023 449th ian-h-chamberlain 🇺🇸 440 109 17ms 16 Oct 2025 454th ValNyz 436 110 22ms 20 Apr 2018 454th hyvyys 436 110 10ms 16 Sep 2020 454th vodker1 436 110 17ms 8 Mar 2022 454th berdzi 436 110 11ms 15 Mar 2022 454th VictorFordham 436 110 16ms 12 Oct 2023 454th NanduBC 436 110 18ms 7 Sep 2024 460th ArturLange 432 111 11ms 5 Sep 2018 460th adesanjo 432 111 17ms 8 Jun 2019 460th vonKrafft 432 111 10ms 26 Mar 2020 460th TinyTheBrontosaurus 432 111 10ms 4 Dec 2023 460th 123mjb 432 111 11ms 26 Jun 2025 460th tomh1012 432 111 11ms 5 Feb 2026 460th zgialor-lab 432 111 12ms 18 days ago 467th boxjelly 429 112 11ms 10 Jan 2021 467th Pena86 429 112 11ms 18 Feb 2021 467th Kasci 429 112 80ms 28 Dec 2021 467th Omega65536 🇩🇪 429 112 10ms 29 Nov 2022 467th epic-programmer-guy 429 112 15ms 26 Dec 2023 472nd nkansal96 425 113 17ms 21 May 2019 472nd TobyBoyne 🇬🇧 425 113 16ms 1 Jun 2019 472nd dymowski 425 113 18ms 24 Jul 2019 472nd weberax 425 113 9ms 30 Nov 2019 472nd AIn0n 425 113 18ms 15 Jul 2021 472nd super-tux 425 113 66ms 9 Aug 2021 472nd olavaga 425 113 11ms 13 Aug 2021 472nd nkoppel 425 113 11ms 20 Oct 2022 472nd Skwerl23 425 113 18ms 3 Feb 2023 First Prev 401–480 of 712 Next Last
