The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 38 hours. 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 Sandw1ch123 851 74 19ms 83 mins ago 322nd martinnorling 🇸🇪 840 75 24ms 5 May 2022 322nd Trunksistor 🇫🇷 840 75 24ms 9 May 2022 322nd bbakersmith 840 75 22ms 28 Jun 2022 322nd bsoyka 🇺🇸 840 75 19ms 16 Jul 2022 322nd P-Quentin 🇫🇷 840 75 21ms 3 Aug 2022 322nd julienlamoureux78 840 75 20ms 12 Aug 2022 322nd dzshn 840 75 24ms 16 Aug 2022 322nd NerdyMcNerd42 840 75 20ms 20 Aug 2022 322nd destofr 840 75 18ms 25 Aug 2022 322nd vishwathg 840 75 49ms 10 Oct 2022 322nd nkoppel 840 75 19ms 19 Oct 2022 322nd AZ9tumas 840 75 20ms 23 Oct 2022 322nd EthanGrant1 840 75 24ms 7 Nov 2022 322nd Omega65536 🇩🇪 840 75 19ms 24 Nov 2022 322nd b10011 🇫🇮 840 75 24ms 3 Jan 2023 322nd 4ndyJ 🇬🇧 840 75 23ms 3 Jan 2023 322nd randolchance 840 75 21ms 8 Jan 2023 322nd LeeCamp 840 75 20ms 12 Jan 2023 322nd hellwue 840 75 20ms 15 Feb 2023 322nd nandanjp 840 75 20ms 29 Mar 2023 322nd kaptsanovb 840 75 24ms 20 Apr 2023 322nd galloj 🇨🇿 840 75 18ms 20 May 2023 322nd jhu04 840 75 19ms 23 Jun 2023 322nd HelloYuiYui 840 75 18ms 1 Nov 2023 322nd tobyLovick 840 75 26ms 10 Nov 2023 322nd VictorStenvers 🇳🇱 840 75 22ms 13 Nov 2023 322nd RZ781 840 75 27ms 19 Nov 2023 322nd mikehanus 840 75 26ms 21 Nov 2023 322nd 1231234md5 🇨🇳 840 75 20ms 14 Dec 2023 322nd Hebelub 840 75 23ms 6 Jan 2024 322nd minhtrancccp 840 75 25ms 11 Jan 2024 322nd 123mjb 840 75 22ms 25 Jan 2024 322nd jbjd 840 75 23ms 25 Feb 2024 322nd gabe-gallegos 840 75 19ms 2 May 2024 322nd kejcao 🇨🇦 840 75 25ms 11 May 2024 322nd f-tucker 840 75 22ms 24 May 2024 322nd Florian-Mt 840 75 19ms 22 Jul 2024 322nd codingisgreatbutiamnot 840 75 21ms 9 Aug 2024 322nd Terobero 840 75 32ms 23 Aug 2024 322nd abhishekg999 840 75 49ms 17 Sep 2024 322nd RedzGoose 🇦🇺 840 75 22ms 7 Oct 2024 322nd Clay-Goodling 840 75 24ms 8 Oct 2024 322nd JunkIce 840 75 24ms 5 Mar 2025 322nd jiji7879 840 75 24ms 20 Jun 2025 322nd faragocsaba 840 75 24ms 22 Jun 2025 322nd bknower 840 75 19ms 30 Jun 2025 322nd clayboll99 840 75 23ms 14 Jul 2025 322nd Nikinator2704 840 75 18ms 1 Nov 2025 322nd mmoffitt 840 75 26ms 19 Nov 2025 322nd AdrienHache 🇫🇷 840 75 19ms 20 Dec 2025 322nd enigma 840 75 32ms 21 Dec 2025 322nd jesuscbm 840 75 19ms 26 Feb 2026 322nd ASampsonMu31 840 75 51ms 16 days ago 375th guilhem-roy 🇫🇷 829 76 24ms 5 May 2022 375th NewDefectus 🇮🇱 829 76 22ms 6 May 2022 375th CuboidRaptor 🇨🇦 829 76 23ms 25 May 2022 375th TheSmilingTurtle 829 76 26ms 5 Jun 2022 375th Romain-1 🇫🇷 829 76 19ms 8 Jun 2022 375th jhpaques 🇫🇷 829 76 23ms 30 Jul 2022 375th chriscianfarani 829 76 25ms 10 Aug 2022 375th eshilo-draper 829 76 21ms 13 Sep 2022 375th suwat513 829 76 21ms 22 Sep 2022 375th Jaydosu 829 76 23ms 14 Nov 2022 375th tails618 829 76 27ms 2 Dec 2022 375th KevinLyvers 829 76 20ms 17 Dec 2022 375th nayakrujul 829 76 20ms 3 Jan 2023 375th CheeseCake628 🇳🇴 829 76 23ms 8 Jan 2023 375th CatsAreFluffy 829 76 26ms 18 Feb 2023 375th adamnielson42 🇺🇸 829 76 19ms 1 Mar 2023 375th Schreipfelerer 829 76 27ms 9 Apr 2023 375th hm5822 829 76 27ms 22 Apr 2023 375th celiendonze 🇨🇭 829 76 27ms 5 Jul 2023 375th brochmann 🇸🇪 829 76 21ms 13 Aug 2023 375th Command-Master 829 76 36ms 2 Oct 2023 375th chartung17 829 76 21ms 17 Dec 2023 375th smokestacklightnin 🇺🇸 829 76 26ms 10 Jan 2024 375th NickTheEASDude 🇺🇸 829 76 53ms 26 Jan 2024 375th yuchuehw 829 76 26ms 2 Feb 2024 375th Azearia 829 76 26ms 26 Feb 2024 First Prev 321–400 of 842 Next Last
