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?
𝑒 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 641st jacobly0 🇺🇸 796 174 1,676ms 18 Sep 2025 642nd jared-hughes 794 77 3,739ms 18 Sep 2024 643rd jared-hughes 794 250 388ms 22 Jul 2023 644th dokutan 792 42 7ms 25 Feb 2026 645th chunes3 🇺🇸 792 48 228ms 15 Sep 2023 646th 2bular 791 49 215ms 23 Oct 2024 647th lyphyser 791 61 10ms 3 Jun 2023 647th targrik 791 61 10ms 18 Feb 2025 647th Posandu 791 61 15ms 27 Aug 2025 650th Natanaelel 🇸🇪 791 67 114ms 22 Apr 2025 651st MeWhenI 🇻🇦 790 98 475ms 28 Feb 2022 652nd stefangimmillaro 790 122 150ms 8 Mar 2023 653rd NewDefectus 🇮🇱 789 105 3ms 1 Nov 2021 654th msbranicky 789 160 372ms 31 Aug 2023 655th CatsAreFluffy 788 54 90ms 19 Dec 2022 656th BlankSpruce 788 129 65ms 17 Feb 2023 657th DialFrost 🇸🇬 785 50 784ms 29 Aug 2025 658th TFeld00 🇩🇰 783 60 10ms 5 Oct 2020 658th prplz 🇦🇺 783 60 10ms 13 Oct 2020 658th NewDefectus 🇮🇱 783 60 9ms 14 Feb 2021 658th jared-hughes 783 60 9ms 6 Oct 2021 658th btjones0 783 60 9ms 6 Dec 2021 658th didion0 🇺🇸 783 60 9ms 24 Feb 2022 658th Irratix 🇳🇱 783 60 9ms 26 Apr 2022 658th mathisfun271 783 60 10ms 13 Feb 2024 658th jipsong 🇩🇪 783 60 10ms 22 Mar 2024 658th Herbert00709 🇵🇱 783 60 16ms 7 May 2024 658th piano-miles 783 60 10ms 2 Aug 2025 658th YAJUE114514 783 60 10ms 11 Dec 2025 658th anter69 🇭🇺 783 60 10ms 1 Feb 2026 671st iczelia 🇩🇪 781 106 4ms 21 Sep 2025 672nd CaedenHarper 🇨🇦 779 162 308ms 1 Nov 2025 673rd emgordon154 778 71 1,360ms 10 May 2025 674th jacobly0 🇺🇸 777 102 77ms 10 Oct 2023 675th stefangimmillaro 776 105 114ms 3 Oct 2023 676th jacobly0 🇺🇸 775 93 207ms 2 Oct 2023 677th m-tkach 🇺🇦 775 210 4,857ms 15 Jan 2025 678th MeWhenI 🇻🇦 774 132 468ms 7 Nov 2025 679th luuumine 🇫🇷 774 136 128ms 17 Nov 2025 680th ovs-code 🇩🇪 773 108 235ms 22 Feb 2025 681st postie77 773 116 432ms 17 May 2023 682nd Shanethegamer 🇺🇸 771 49 41ms 26 May 2022 682nd DialFrost 🇸🇬 771 49 43ms 31 May 2024 682nd lacrosse 771 49 98ms 29 Nov 2025 685th sean-niemann 🇺🇸 771 125 186ms 21 Mar 2025 686th cubed-guy 770 61 9ms 13 Feb 2022 686th snydej 770 61 10ms 3 Dec 2024 688th CaedenHarper 🇨🇦 769 51 1,019ms 10 Sep 2025 689th SirBogman 🇺🇸 769 75 1,325ms 29 Jan 2024 689th DialFrost 🇸🇬 769 75 1,383ms 10 Mar 2025 691st annaproxy 768 69 114ms 12 Jan 2022 692nd MeWhenI 🇻🇦 768 106 118ms 31 Jul 2023 693rd daniel-pedersen 🇸🇪 766 63 13ms 6 Mar 2022 693rd HamzaM3 766 63 11ms 6 Mar 2022 693rd FlorianCassayre 🇫🇷 766 63 12ms 4 Jun 2024 696th Shanethegamer 🇺🇸 766 101 469ms 2 Mar 2022 697th DialFrost 🇸🇬 765 73 11ms 3 Jan 2026 698th prestosilver 🇺🇸 765 141 196ms 2 Feb 2026 699th iczelia 🇩🇪 764 133 58ms 21 Sep 2025 700th acotis 763 138 141ms 7 Jun 2025 701st kmathis22 762 134 485ms 23 Oct 2025 702nd MeWhenI 🇻🇦 760 118 438ms 8 Dec 2022 703rd latvianfarmer17 🇱🇻 759 40 175ms 20 Jul 2023 704th georgehulme 758 62 16ms 5 Oct 2022 704th Pyroan 758 62 16ms 14 May 2025 706th stefangimmillaro 758 117 47ms 26 Apr 2025 706th SirBogman 🇺🇸 758 117 41ms 3 Jun 2025 708th flawr 757 70 125ms 1 Jan 2019 709th jipsong 🇩🇪 757 73 1,344ms 8 Apr 2025 710th sean-niemann 🇺🇸 757 80 103ms 23 Jul 2023 711th DialFrost 🇸🇬 756 44 8ms 22 Feb 2026 712th cure-honey 🇯🇵 756 167 287ms 23 Jun 2021 712th targrik 756 167 301ms 4 Jul 2025 714th jared-hughes 755 50 38ms 20 Jan 2023 714th jipsong 🇩🇪 755 50 37ms 8 Apr 2025 716th ovs-code 🇩🇪 755 74 13ms 10 Dec 2023 717th stefangimmillaro 752 168 288ms 21 Oct 2024 718th MeWhenI 🇻🇦 749 84 29ms 2 Oct 2022 719th DialFrost 🇸🇬 747 32 48ms 15 Mar 2025 720th Herbert00709 🇵🇱 747 60 447ms 13 May 2024 First Prev 641–720 of 3,473 Next Last