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 472nd bropal404 🇮🇳 425 113 600ms 6 Mar 2025 482nd kenny14231 421 114 10ms 6 Aug 2022 482nd aalec 421 114 111ms 24 Apr 2024 482nd ApoChagi 421 114 18ms 25 Oct 2025 485th michelebastione 🇮🇹 417 115 12ms 19 Nov 2019 485th artieleach 417 115 18ms 12 Dec 2020 485th ktanaka 417 115 10ms 11 Jan 2024 485th clayboll99 417 115 10ms 11 Jul 2025 485th arjunarya1 417 115 11ms 28 Aug 2025 490th sambirnbaum1 414 116 11ms 7 Sep 2019 490th markus-rekdal 414 116 18ms 23 May 2022 490th rowboat1 414 116 10ms 21 Jun 2022 490th AGoyet 414 116 42ms 29 Jun 2022 494th madeforlosers 410 117 16ms 7 Nov 2025 495th caerbannogwhite 407 118 16ms 13 Apr 2018 495th danwley 407 118 10ms 2 Apr 2019 495th siegelzero 407 118 15ms 24 Jan 2020 495th mothcolada 🇺🇸 407 118 11ms 4 Dec 2020 495th lukehatcher 🇺🇸 407 118 18ms 30 Aug 2021 495th midnattssol 🇸🇪 407 118 12ms 27 Jul 2023 495th JesseNoEyes 🇺🇸 407 118 10ms 25 Sep 2024 502nd dddthedark 403 119 9ms 11 Jan 2018 502nd raywinray 403 119 10ms 27 Sep 2018 502nd alangodfrey 403 119 11ms 11 Jun 2019 502nd ElevatorShaft 403 119 9ms 18 Jun 2019 502nd iso4096 403 119 9ms 8 Mar 2020 502nd Andre3582 403 119 10ms 25 Oct 2020 502nd enbyte 403 119 9ms 27 May 2021 502nd Hannah-Varekamp 403 119 10ms 17 Jun 2021 502nd StarmaQ 403 119 9ms 12 Jan 2022 502nd Trunksistor 🇫🇷 403 119 17ms 19 Apr 2022 502nd Puperger 403 119 9ms 19 Jun 2022 502nd jhpaques 🇫🇷 403 119 9ms 29 Jul 2022 502nd kevdah 403 119 9ms 2 Aug 2022 502nd bwenstar 403 119 9ms 9 Aug 2022 502nd mdnestor 403 119 9ms 28 Dec 2022 502nd mbittner20 403 119 11ms 27 May 2023 502nd therealnumbers 403 119 10ms 4 Jun 2024 502nd RedzGoose 🇦🇺 403 119 9ms 25 Oct 2024 502nd mishak-sys 403 119 9ms 31 Mar 2025 502nd damoose717 403 119 11ms 23 May 2025 502nd WillowWispy 403 119 17ms 25 May 2025 502nd averagepythondev 403 119 9ms 2 Jan 2026 524th jaredcrystal 🇺🇸 400 120 17ms 17 Mar 2018 524th BenBanerjeeRichards 400 120 10ms 20 Jan 2022 526th johnnythedoggie 397 121 23ms 26 Apr 2021 526th brimstonetrader 397 121 10ms 22 Jan 2024 528th babakoban 393 122 9ms 30 Aug 2019 528th AreYouW 393 122 10ms 6 Dec 2019 528th Hawkeye99 393 122 9ms 6 Dec 2019 528th ADV1K 🇮🇳 393 122 9ms 18 Feb 2020 528th garrisonhh 393 122 16ms 21 Nov 2020 528th Command-Crafter 393 122 10ms 8 Nov 2021 528th Demonarchet 393 122 10ms 2 May 2023 528th 0dyse 393 122 11ms 29 Apr 2025 528th osNiko 🇧🇷 393 122 11ms 23 Jul 2025 537th lukasmoellerch 390 123 11ms 14 Jan 2019 537th Kreavita 390 123 11ms 14 Jan 2019 537th timkaiser 390 123 11ms 19 Apr 2019 537th bobbysq 390 123 11ms 29 Jun 2023 541st KarachunIvan 387 124 11ms 19 Feb 2018 541st sleepyStick 387 124 16ms 11 Mar 2022 541st Apfelvater 387 124 17ms 26 days ago 544th lmeuser 384 125 11ms 2 Dec 2017 544th 0xCake 384 125 17ms 20 Apr 2020 544th haydenridd 384 125 9ms 20 Oct 2020 544th markbyrne 384 125 10ms 20 Oct 2020 544th samchristiandd 384 125 11ms 19 Feb 2021 544th clementblaudeau 384 125 9ms 26 May 2021 544th brochmann 🇸🇪 384 125 9ms 6 Feb 2022 544th AliceFord 384 125 9ms 2 Jun 2022 544th elephantpanda 384 125 10ms 31 Aug 2022 544th Azearia 384 125 10ms 1 Dec 2022 544th Schreipfelerer 384 125 10ms 9 Apr 2023 544th eddvrs 384 125 10ms 21 Dec 2023 544th qwjhvbxi 384 125 12ms 8 Feb 2024 544th Pale-Vessel 384 125 10ms 1 Apr 2024 544th hippopotam00sehead 🇨🇦 384 125 10ms 13 Sep 2024 544th TralfamadorianComedian 384 125 10ms 31 Dec 2024 544th TheZwierzLF 🇵🇱 384 125 32ms 25 May 2025 First Prev 481–560 of 712 Next Last
