The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
ln 2 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 72nd Joe325987 930 57 18ms 24 Feb 2026 82nd Command-Master 898 59 18ms 23 Sep 2023 82nd croc54 898 59 22ms 9 Dec 2024 82nd redweasel 898 59 1,364ms 13 Jul 2025 82nd TheSecondComing123 898 59 21ms 7 Feb 2026 86th Irratix 🇳🇱 883 60 22ms 2 Aug 2023 86th mathisfun271 883 60 17ms 4 Feb 2024 86th Herbert00709 🇵🇱 883 60 19ms 5 May 2024 86th bricknellj 883 60 18ms 23 May 2024 90th quimey 869 61 19ms 1 Aug 2023 90th Natanaelel 🇸🇪 869 61 19ms 1 Aug 2023 90th fkantelberg 869 61 18ms 4 Aug 2023 90th anter69 🇭🇺 869 61 17ms 25 Oct 2023 90th snydej 869 61 17ms 3 Dec 2024 90th andrewjc2000 869 61 20ms 25 Jul 2025 90th albanian-laundromat 869 61 17ms 26 Sep 2025 90th solisolu 869 61 20ms 4 Jan 2026 90th Lv0Sys 🇵🇱 869 61 26ms 17 Feb 2026 90th JOrE20 869 61 34ms 19 Feb 2026 100th janbehrens 🇩🇪 855 62 18ms 1 Aug 2023 100th prplz 🇦🇺 855 62 33ms 5 Aug 2023 100th Shanethegamer 🇺🇸 855 62 17ms 10 Aug 2023 100th NewDefectus 🇮🇱 855 62 17ms 19 Aug 2023 100th ListeriaM 855 62 17ms 19 Aug 2023 100th btjones0 855 62 18ms 24 Aug 2023 100th Yewzir 🇧🇪 855 62 17ms 24 Oct 2023 100th programjames 855 62 29ms 24 Dec 2023 100th ASampsonMu31 855 62 18ms 12 days ago 109th Mch47 841 63 17ms 28 Oct 2023 110th jared-hughes 828 64 11ms 1 Aug 2023 110th OllieBoyne 🇬🇧 828 64 315ms 9 Aug 2023 110th FlorianCassayre 🇫🇷 828 64 90ms 1 Oct 2023 110th davitf 828 64 26ms 21 Nov 2024 110th jatloe 828 64 18ms 17 Mar 2025 110th cros107 🇦🇺 828 64 87ms 16 Sep 2025 116th SB-945 815 65 18ms 6 Feb 2024 116th elgan65536 🇺🇸 815 65 31ms 5 Mar 2024 116th agreegious 815 65 90ms 16 Mar 2025 119th AlexanderFair 803 66 33ms 1 Aug 2023 119th jmerle 🇳🇱 803 66 19ms 2 Aug 2023 119th MaxElf999 803 66 89ms 3 Aug 2023 119th qwertzguy 🇫🇷 803 66 17ms 9 Aug 2023 119th nstearns96 🇬🇧 803 66 18ms 15 Sep 2023 119th SeanJxie 803 66 90ms 7 Jan 2024 119th 77Tigers 803 66 91ms 6 Jun 2024 119th guilhem-roy 🇫🇷 803 66 19ms 10 Jul 2024 119th yokasuretsu 803 66 36ms 6 Jan 2025 119th ahmetdemirag 🇨🇾 803 66 18ms 3 Apr 2025 119th elana-teal 803 66 19ms 21 Jun 2025 119th Languag3 803 66 18ms 29 Dec 2025 119th tomh1012 803 66 27ms 22 days ago 132nd inverseLorentz 🇦🇺 791 67 86ms 29 Oct 2023 132nd dal548 791 67 19ms 12 Jun 2024 132nd CutSandstone 791 67 35ms 4 Jul 2024 132nd jiaminglimjm 🇲🇾 791 67 26ms 5 Jul 2024 136th setop 779 68 17ms 18 Aug 2023 136th levavft 779 68 92ms 27 Oct 2023 138th falsidge 768 69 197ms 9 Jul 2024 138th hamilton-bonds 768 69 18ms 9 Sep 2024 140th kasarino 757 70 91ms 29 Jan 2026 141st davecame 746 71 22ms 12 Oct 2023 141st Pyroan 746 71 18ms 11 Mar 2025 143rd XioR112 🇵🇱 736 72 17ms 29 Aug 2023 143rd rollershutter 736 72 18ms 9 Nov 2023 143rd Dataen 736 72 18ms 10 Jan 2024 143rd Hebelub 736 72 17ms 10 Jan 2024 143rd jfallon1997 736 72 17ms 30 Apr 2024 143rd pinguicula 736 72 10ms 15 Aug 2024 143rd ImpressedByRocks 736 72 178ms 24 May 2025 143rd FortuiteMan 🇫🇷 736 72 18ms 28 Sep 2025 151st adamnielson42 🇺🇸 726 73 18ms 14 Aug 2023 151st jtaxen 726 73 17ms 17 Mar 2024 151st ei14 726 73 179ms 23 May 2024 151st EnTerr 726 73 17ms 17 Jun 2024 151st YAJUE114514 726 73 10ms 10 Dec 2025 156th clemmers 🇺🇸 707 75 18ms 1 Aug 2023 156th bac0id 707 75 18ms 20 Sep 2023 158th msbranicky 697 76 17ms 3 Aug 2023 158th StHagel 697 76 18ms 3 Aug 2023 158th SniperSmiley 🇺🇸 697 76 17ms 15 Aug 2023 First Prev 81–160 of 262 Next Last