The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
ln 2 in all languages 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 481st MeWhenI 🇻🇦 782 149 664ms 7 Nov 2025 482nd AlexanderFair 780 66 33ms 1 Aug 2023 482nd jmerle 🇳🇱 780 66 19ms 2 Aug 2023 482nd MaxElf999 780 66 89ms 3 Aug 2023 482nd qwertzguy 🇫🇷 780 66 17ms 9 Aug 2023 482nd nstearns96 🇬🇧 780 66 18ms 15 Sep 2023 482nd SeanJxie 780 66 90ms 7 Jan 2024 482nd 77Tigers 780 66 91ms 6 Jun 2024 482nd guilhem-roy 🇫🇷 780 66 19ms 10 Jul 2024 482nd yokasuretsu 780 66 36ms 6 Jan 2025 482nd ahmetdemirag 🇨🇾 780 66 18ms 3 Apr 2025 482nd elana-teal 780 66 19ms 21 Jun 2025 482nd Languag3 780 66 18ms 29 Dec 2025 482nd tomh1012 780 66 27ms 22 days ago 495th emgordon154 779 85 2,943ms 8 Nov 2024 496th MeWhenI 🇻🇦 778 99 525ms 1 Aug 2023 497th Yax42 🇫🇷 777 65 18ms 8 Sep 2025 498th jared-hughes 776 143 73ms 1 Aug 2023 499th MeWhenI 🇻🇦 775 58 87ms 5 Apr 2025 500th MeWhenI 🇻🇦 775 76 47ms 14 Feb 2025 501st MeWhenI 🇻🇦 774 31 62ms 1 Aug 2023 501st SirBogman 🇺🇸 774 31 57ms 1 Aug 2023 503rd FortuiteMan 🇫🇷 774 87 38ms 29 Sep 2025 504th emgordon154 772 154 1,572ms 30 Apr 2025 505th MeWhenI 🇻🇦 769 107 136ms 1 Aug 2023 506th masflam 768 50 268ms 21 Jun 2024 507th inverseLorentz 🇦🇺 768 67 86ms 29 Oct 2023 507th dal548 768 67 19ms 12 Jun 2024 507th CutSandstone 768 67 35ms 4 Jul 2024 507th jiaminglimjm 🇲🇾 768 67 26ms 5 Jul 2024 511th SirBogman 🇺🇸 766 52 347ms 4 Aug 2023 511th bitsandbeyond 🇳🇱 766 52 1,704ms 5 Nov 2025 513th eprovst 🇧🇪 765 37 69ms 16 Sep 2025 514th alexsave 765 66 37ms 16 Nov 2025 515th edsrzf 🇳🇿 762 108 134ms 29 Apr 2025 516th primo-ppcg 🇹🇭 761 48 96ms 1 Aug 2023 516th JayXon 🇺🇸 761 48 92ms 1 Aug 2023 516th emgordon154 761 48 47ms 20 Sep 2025 519th stefangimmillaro 761 87 2,688ms 19 Nov 2024 520th setop 757 68 17ms 18 Aug 2023 520th levavft 757 68 92ms 27 Oct 2023 522nd GrayJoKing 🇦🇺 755 148 90ms 27 Feb 2024 523rd SirBogman 🇺🇸 753 130 6ms 1 Aug 2023 524th MeWhenI 🇻🇦 752 53 327ms 14 Jul 2024 525th snoozingnewt 🇨🇦 752 58 1,784ms 22 Oct 2025 526th CornerMercury 🇬🇧 750 32 54ms 28 Sep 2023 527th acotis 750 175 151ms 29 Jun 2025 528th m-tkach 🇺🇦 750 210 144ms 17 Dec 2023 529th inventshah 749 148 1,628ms 23 Jul 2024 530th emgordon154 748 103 519ms 27 May 2025 531st zacjl 746 45 15ms 21 Jan 2025 531st DialFrost 🇸🇬 746 45 16ms 21 Jan 2025 531st primo-ppcg 🇹🇭 746 45 15ms 16 Apr 2025 534th qwertzguy 🇫🇷 746 66 446ms 25 Mar 2025 535th falsidge 746 69 197ms 9 Jul 2024 535th hamilton-bonds 746 69 18ms 9 Sep 2024 537th emgordon154 746 81 94ms 7 Dec 2024 538th sean-niemann 🇺🇸 746 108 1,687ms 3 Jul 2025 539th SirBogman 🇺🇸 744 149 66ms 1 Aug 2023 540th Yax42 🇫🇷 743 122 485ms 26 Nov 2025 541st edsrzf 🇳🇿 736 61 80ms 8 Dec 2025 542nd kasarino 736 70 91ms 29 Jan 2026 543rd Herbert00709 🇵🇱 727 33 54ms 5 May 2024 543rd lifthrasiir 🇰🇷 727 33 61ms 5 Dec 2024 545th 0dyse 725 53 229ms 7 May 2025 546th stefangimmillaro 725 55 383ms 5 Aug 2023 547th davecame 725 71 22ms 12 Oct 2023 547th Pyroan 725 71 18ms 11 Mar 2025 549th jerrandolph 722 191 580ms 30 Sep 2025 550th dokutan 721 52 9ms 25 Feb 2026 551st two-bad 🇬🇧 721 70 17ms 13 Dec 2023 552nd DialFrost 🇸🇬 720 92 2,724ms 28 Oct 2024 553rd XioR112 🇵🇱 715 72 17ms 29 Aug 2023 553rd rollershutter 715 72 18ms 9 Nov 2023 553rd Dataen 715 72 18ms 10 Jan 2024 553rd Hebelub 715 72 17ms 10 Jan 2024 553rd jfallon1997 715 72 17ms 30 Apr 2024 553rd pinguicula 715 72 10ms 15 Aug 2024 553rd ImpressedByRocks 715 72 178ms 24 May 2025 553rd FortuiteMan 🇫🇷 715 72 18ms 28 Sep 2025 First Prev 481–560 of 1,841 Next Last