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?
Collatz in Python in bytes. 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 Bytes Time Submitted 206th frankgraziano 851 74 18ms 19 Feb 2023 206th KenanHanke 851 74 20ms 21 Feb 2023 206th DanielPeterssonAI 851 74 20ms 13 Mar 2023 206th jiaminglimjm 🇲🇾 851 74 20ms 20 Mar 2023 206th ejini6969 851 74 18ms 22 Mar 2023 206th GulgDev 851 74 19ms 22 Mar 2023 206th vrnprkh 851 74 19ms 30 Mar 2023 206th RuyiLi 851 74 21ms 1 Apr 2023 206th StardustGogeta 851 74 19ms 7 May 2023 206th zbreit 🇺🇸 851 74 20ms 7 May 2023 206th kyleclaassen 851 74 20ms 20 May 2023 206th mbittner20 851 74 20ms 27 May 2023 206th tweska 🇳🇱 851 74 20ms 5 Jun 2023 206th rollershutter 851 74 21ms 7 Jul 2023 206th 2011-Chan-Ethan 851 74 19ms 9 Jul 2023 206th cros107 🇦🇺 851 74 21ms 11 Aug 2023 206th yourlefthandman 851 74 20ms 16 Aug 2023 206th daisyyedda 851 74 21ms 17 Aug 2023 206th cesarm4 851 74 19ms 29 Aug 2023 206th midnattssol 🇸🇪 851 74 20ms 22 Sep 2023 206th lambda-abstraction 851 74 20ms 21 Oct 2023 206th levavft 851 74 20ms 26 Oct 2023 206th Buecherfresser 851 74 19ms 22 Nov 2023 206th anarconic 851 74 50ms 8 Dec 2023 206th azure-blondon 851 74 19ms 11 Dec 2023 206th kurkale6ka 851 74 22ms 20 Dec 2023 206th Dataen 851 74 19ms 10 Jan 2024 206th Anonymousellama21 851 74 22ms 14 Mar 2024 206th Bmrl7 851 74 20ms 23 Mar 2024 206th cefqrn 851 74 20ms 26 May 2024 206th drochom 851 74 19ms 18 Jun 2024 206th hiichbindermax 851 74 19ms 22 Jun 2024 206th wuzekai518 851 74 25ms 9 Jul 2024 206th cykim8811 851 74 45ms 11 Jul 2024 206th imelxr 🇮🇱 851 74 25ms 17 Aug 2024 206th EnTerr 851 74 20ms 25 Aug 2024 206th Mabeloid 🇳🇴 851 74 20ms 1 Sep 2024 206th madeforlosers 851 74 19ms 5 Sep 2024 206th LostSyntax21 🇬🇧 851 74 19ms 10 Sep 2024 206th Deedogg 851 74 19ms 11 Sep 2024 206th MassimoParisi 851 74 21ms 18 Sep 2024 206th lifthrasiir 🇰🇷 851 74 18ms 13 Nov 2024 206th agreegious 851 74 19ms 17 Nov 2024 206th Stockoh 🇫🇷 851 74 27ms 17 Nov 2024 206th Andrey135296 851 74 22ms 24 Nov 2024 206th TralfamadorianComedian 851 74 18ms 6 Dec 2024 206th bltnppcnt 851 74 36ms 3 Jan 2025 206th ZorblaxV 851 74 21ms 12 Jan 2025 206th yokasuretsu 851 74 22ms 13 Jan 2025 206th Artemis21 🇬🇧 851 74 20ms 17 Jan 2025 206th gdpr777 851 74 37ms 10 Feb 2025 206th Pyroan 851 74 21ms 27 Mar 2025 206th Squimbletin 851 74 20ms 19 Apr 2025 206th Kowalskiexe 🇵🇱 851 74 20ms 19 Apr 2025 206th Dandandooo 851 74 20ms 23 Apr 2025 206th khangtm123 851 74 20ms 4 May 2025 206th 40fied4t 851 74 19ms 6 May 2025 206th keelimeguy 🇺🇸 851 74 19ms 13 May 2025 206th TheZwierzLF 🇵🇱 851 74 21ms 21 May 2025 206th kbeat 🇰🇿 851 74 19ms 21 May 2025 206th LvLError 851 74 19ms 29 May 2025 206th ffelixm 851 74 20ms 3 Jun 2025 206th DoubleUynn 851 74 19ms 25 Jun 2025 206th osNiko 🇧🇷 851 74 20ms 26 Jul 2025 206th wobblybits 851 74 18ms 13 Aug 2025 206th denisfouchard 851 74 19ms 23 Aug 2025 206th Emutis 🇱🇹 851 74 20ms 23 Aug 2025 206th edsrzf 🇳🇿 851 74 19ms 10 Sep 2025 206th Matter1024 🇮🇳 851 74 20ms 11 Sep 2025 206th pauljoohyunkim 851 74 18ms 25 Sep 2025 206th joll05 🇸🇪 851 74 23ms 1 Oct 2025 206th retrohun 851 74 19ms 3 Oct 2025 206th solisolu 851 74 19ms 4 Oct 2025 206th Code-Coder-coder 851 74 19ms 12 Oct 2025 206th fvla 851 74 25ms 31 Oct 2025 206th zgialor-lab 851 74 18ms 17 Dec 2025 206th 77Tigers 851 74 23ms 8 Jan 2026 206th netfri25 🇮🇱 851 74 20ms 31 Jan 2026 206th rotemkm 851 74 19ms 14 Feb 2026 206th RodAlc24 🇪🇸 851 74 19ms 26 days ago First Prev 241–320 of 841 Next Last
