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?
𝑒 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 631st andrewjc2000 794 59 12ms 12 Mar 2025 631st FortuiteMan 🇫🇷 794 59 19ms 6 Dec 2025 631st ASampsonMu31 794 59 10ms 13 days ago 644th kg583 🇺🇸 793 70 13ms 23 Nov 2025 645th jared-hughes 793 250 388ms 22 Jul 2023 646th jared-hughes 791 77 3,739ms 18 Sep 2024 647th jacobly0 🇺🇸 789 174 1,676ms 18 Sep 2025 648th lyphyser 788 61 10ms 3 Jun 2023 648th targrik 788 61 10ms 18 Feb 2025 648th Posandu 788 61 15ms 27 Aug 2025 651st stefangimmillaro 788 122 150ms 8 Mar 2023 652nd Natanaelel 🇸🇪 787 67 114ms 22 Apr 2025 653rd MeWhenI 🇻🇦 787 98 475ms 28 Feb 2022 654th msbranicky 787 160 372ms 31 Aug 2023 655th Indivicivet 786 36 170ms 30 Mar 2021 655th msbranicky 786 36 144ms 12 Jan 2024 657th chunes3 🇺🇸 785 48 228ms 15 Sep 2023 658th BlankSpruce 785 129 65ms 17 Feb 2023 659th 2bular 784 49 215ms 23 Oct 2024 660th dokutan 781 42 7ms 25 Feb 2026 661st NewDefectus 🇮🇱 781 60 9ms 14 Feb 2021 661st jared-hughes 781 60 9ms 6 Oct 2021 661st didion0 🇺🇸 781 60 9ms 24 Feb 2022 661st crispshaker 781 60 17ms 18 Mar 2023 661st elgan65536 🇺🇸 781 60 10ms 18 Nov 2023 661st mathisfun271 781 60 10ms 13 Feb 2024 661st jipsong 🇩🇪 781 60 10ms 22 Mar 2024 661st YAJUE114514 781 60 10ms 11 Dec 2025 669th snoozingnewt 🇨🇦 781 86 326ms 14 days ago 670th Shanethegamer 🇺🇸 779 56 433ms 18 Jan 2024 670th Yewzir 🇧🇪 779 56 400ms 4 Feb 2024 670th Herbert00709 🇵🇱 779 56 452ms 13 May 2024 673rd CaedenHarper 🇨🇦 778 162 308ms 1 Nov 2025 674th NewDefectus 🇮🇱 777 105 3ms 1 Nov 2021 675th MeWhenI 🇻🇦 777 130 468ms 7 Nov 2025 676th DialFrost 🇸🇬 776 50 784ms 29 Aug 2025 677th emgordon154 774 71 1,360ms 10 May 2025 678th jacobly0 🇺🇸 774 102 77ms 10 Oct 2023 679th m-tkach 🇺🇦 773 210 4,857ms 15 Jan 2025 680th stefangimmillaro 772 105 114ms 3 Oct 2023 681st luuumine 🇫🇷 772 136 128ms 17 Nov 2025 682nd iczelia 🇩🇪 770 106 4ms 21 Sep 2025 683rd ovs-code 🇩🇪 770 108 235ms 22 Feb 2025 684th ovs-code 🇩🇪 769 26 41ms 16 May 2024 685th sean-niemann 🇺🇸 769 125 186ms 21 Mar 2025 686th cubed-guy 768 61 9ms 13 Feb 2022 686th enbyte 768 61 23ms 9 Dec 2023 686th snydej 768 61 10ms 3 Dec 2024 689th Shanethegamer 🇺🇸 766 49 41ms 26 May 2022 689th DialFrost 🇸🇬 766 49 43ms 31 May 2024 689th lacrosse 766 49 98ms 29 Nov 2025 692nd SirBogman 🇺🇸 765 75 1,325ms 29 Jan 2024 692nd DialFrost 🇸🇬 765 75 1,383ms 10 Mar 2025 694th MeWhenI 🇻🇦 765 106 118ms 31 Jul 2023 695th annaproxy 764 69 114ms 12 Jan 2022 696th MeWhenI 🇻🇦 764 88 386ms 15 Jul 2023 697th daniel-pedersen 🇸🇪 763 63 13ms 6 Mar 2022 697th HamzaM3 763 63 11ms 6 Mar 2022 697th FlorianCassayre 🇫🇷 763 63 12ms 4 Jun 2024 700th Shanethegamer 🇺🇸 763 101 469ms 2 Mar 2022 701st postie77 763 116 432ms 17 May 2023 702nd prestosilver 🇺🇸 763 141 196ms 2 Feb 2026 703rd AlexDaniel 🇪🇪 762 37 188ms 24 Feb 2018 703rd Natanaelel 🇸🇪 762 37 115ms 16 Apr 2025 705th iczelia 🇩🇪 762 133 58ms 21 Sep 2025 706th CaedenHarper 🇨🇦 761 51 1,019ms 10 Sep 2025 707th acotis 761 138 141ms 7 Jun 2025 708th DialFrost 🇸🇬 760 73 11ms 3 Jan 2026 709th kmathis22 759 133 485ms 6 Dec 2025 710th georgehulme 756 62 16ms 5 Oct 2022 710th Pyroan 756 62 16ms 14 May 2025 712th stefangimmillaro 755 117 47ms 26 Apr 2025 712th SirBogman 🇺🇸 755 117 41ms 3 Jun 2025 714th cure-honey 🇯🇵 754 167 287ms 23 Jun 2021 714th targrik 754 167 301ms 4 Jul 2025 716th flawr 753 70 125ms 1 Jan 2019 717th jipsong 🇩🇪 753 73 1,344ms 8 Apr 2025 718th sean-niemann 🇺🇸 753 80 103ms 23 Jul 2023 719th jared-hughes 751 50 38ms 20 Jan 2023 719th jipsong 🇩🇪 751 50 37ms 8 Apr 2025 First Prev 641–720 of 3,434 Next Last