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 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 480th jared-hughes 786 119 3,081ms 18 Sep 2024 482nd Herbert00709 🇵🇱 784 125 12ms 10 days ago 483rd MeWhenI 🇻🇦 779 63 152ms 3 Aug 2024 484th emgordon154 779 85 2,943ms 8 Nov 2024 485th wh3n3v3r 🇨🇿 778 65 19ms 7 Nov 2024 486th MeWhenI 🇻🇦 778 99 525ms 1 Aug 2023 487th Yax42 🇫🇷 777 65 18ms 8 Sep 2025 488th jared-hughes 776 143 73ms 1 Aug 2023 489th MeWhenI 🇻🇦 775 58 87ms 5 Apr 2025 490th MeWhenI 🇻🇦 775 76 47ms 14 Feb 2025 491st MeWhenI 🇻🇦 774 31 62ms 1 Aug 2023 491st SirBogman 🇺🇸 774 31 57ms 1 Aug 2023 493rd emgordon154 772 154 1,572ms 30 Apr 2025 494th MeWhenI 🇻🇦 769 107 136ms 1 Aug 2023 495th masflam 768 50 268ms 21 Jun 2024 496th HumanoidCPU 767 63 406ms 2 Sep 2024 496th JunkIce 767 63 402ms 3 Dec 2024 498th SirBogman 🇺🇸 766 52 347ms 4 Aug 2023 498th bitsandbeyond 🇳🇱 766 52 1,704ms 5 Nov 2025 500th AlexanderFair 766 66 33ms 1 Aug 2023 500th jmerle 🇳🇱 766 66 19ms 2 Aug 2023 500th MaxElf999 766 66 89ms 3 Aug 2023 500th qwertzguy 🇫🇷 766 66 17ms 9 Aug 2023 500th nstearns96 🇬🇧 766 66 18ms 15 Sep 2023 500th SeanJxie 766 66 90ms 7 Jan 2024 500th 77Tigers 766 66 91ms 6 Jun 2024 500th guilhem-roy 🇫🇷 766 66 19ms 10 Jul 2024 500th yokasuretsu 766 66 36ms 6 Jan 2025 500th ahmetdemirag 🇨🇾 766 66 18ms 3 Apr 2025 500th elana-teal 766 66 19ms 21 Jun 2025 500th Languag3 766 66 18ms 29 Dec 2025 500th tomh1012 766 66 27ms 22 days ago 513th eprovst 🇧🇪 765 37 69ms 16 Sep 2025 514th alexsave 765 66 37ms 16 Nov 2025 515th MeWhenI 🇻🇦 764 149 664ms 7 Nov 2025 516th edsrzf 🇳🇿 762 108 134ms 29 Apr 2025 517th primo-ppcg 🇹🇭 761 48 96ms 1 Aug 2023 517th JayXon 🇺🇸 761 48 92ms 1 Aug 2023 517th emgordon154 761 48 47ms 20 Sep 2025 520th stefangimmillaro 761 87 2,688ms 19 Nov 2024 521st m-tkach 🇺🇦 757 257 2ms 6 Mar 2024 521st UnderKoen 🇳🇱 757 257 3ms 33 hours ago 523rd emgordon154 756 102 486ms 8 Feb 2026 524th GrayJoKing 🇦🇺 755 148 90ms 27 Feb 2024 525th inverseLorentz 🇦🇺 754 67 86ms 29 Oct 2023 525th dal548 754 67 19ms 12 Jun 2024 525th CutSandstone 754 67 35ms 4 Jul 2024 525th jiaminglimjm 🇲🇾 754 67 26ms 5 Jul 2024 529th SirBogman 🇺🇸 753 130 6ms 1 Aug 2023 530th MeWhenI 🇻🇦 752 53 327ms 14 Jul 2024 531st CornerMercury 🇬🇧 750 32 54ms 28 Sep 2023 532nd acotis 750 175 151ms 29 Jun 2025 533rd m-tkach 🇺🇦 750 210 144ms 17 Dec 2023 534th inventshah 749 148 1,628ms 23 Jul 2024 535th zacjl 746 45 15ms 21 Jan 2025 535th DialFrost 🇸🇬 746 45 16ms 21 Jan 2025 535th primo-ppcg 🇹🇭 746 45 15ms 16 Apr 2025 538th emgordon154 746 81 94ms 7 Dec 2024 539th Yax42 🇫🇷 746 119 485ms 26 Nov 2025 540th SirBogman 🇺🇸 744 149 66ms 1 Aug 2023 541st setop 743 68 17ms 18 Aug 2023 541st levavft 743 68 92ms 27 Oct 2023 543rd snoozingnewt 🇨🇦 737 58 1,784ms 22 Oct 2025 544th edsrzf 🇳🇿 736 61 80ms 8 Dec 2025 545th qwertzguy 🇫🇷 732 66 446ms 25 Mar 2025 546th falsidge 732 69 197ms 9 Jul 2024 546th hamilton-bonds 732 69 18ms 9 Sep 2024 548th SirFireball3521 730 46 935ms 9 Apr 2024 548th Natanaelel 🇸🇪 730 46 134ms 21 Apr 2025 550th Herbert00709 🇵🇱 727 33 54ms 5 May 2024 550th lifthrasiir 🇰🇷 727 33 61ms 5 Dec 2024 552nd stefangimmillaro 726 190 306ms 16 Sep 2023 553rd 0dyse 725 53 229ms 7 May 2025 554th stefangimmillaro 725 55 383ms 5 Aug 2023 555th kasarino 722 70 91ms 29 Jan 2026 556th jerrandolph 722 191 580ms 30 Sep 2025 557th dokutan 721 52 9ms 25 Feb 2026 558th two-bad 🇬🇧 721 70 17ms 13 Dec 2023 559th DialFrost 🇸🇬 720 92 2,724ms 28 Oct 2024 560th SirBogman 🇺🇸 715 47 952ms 3 Aug 2023 First Prev 481–560 of 1,822 Next Last