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 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 872nd atazzam 🇺🇸 689 68 17ms 5 Mar 2023 872nd ei14 689 68 9ms 7 May 2024 883rd puyuliao 689 147 444ms 24 Oct 2023 884th anter69 🇭🇺 687 80 1,260ms 17 Feb 2026 885th lifthrasiir 🇰🇷 686 56 293ms 17 Dec 2024 886th ArmaanAS 686 70 11ms 1 Apr 2021 886th Shanethegamer 🇺🇸 686 70 11ms 26 May 2022 888th rucin93 🇵🇱 686 153 129ms 25 Aug 2024 889th 4hg 🇺🇸 685 55 86ms 16 Sep 2023 890th MeWhenI 🇻🇦 684 88 59ms 15 Jul 2023 891st sk- 683 55 44ms 12 Sep 2019 891st pilaf 🇦🇷 683 55 42ms 14 Apr 2022 893rd albanian-laundromat 682 64 462ms 9 Aug 2025 894th ktiy 682 154 130ms 11 Apr 2022 895th prplz 🇦🇺 680 56 525ms 14 Jun 2020 896th jslip 679 56 23ms 8 Sep 2018 897th knutae 🇳🇴 679 69 11ms 29 Nov 2021 897th inverseLorentz 🇦🇺 679 69 13ms 8 Oct 2023 897th CutSandstone 679 69 11ms 3 Jul 2024 897th cros107 🇦🇺 679 69 10ms 30 Dec 2024 901st cure-honey 🇯🇵 677 142 162ms 23 Jun 2021 902nd Irratix 🇳🇱 675 121 3ms 25 Dec 2021 902nd prestosilver 🇺🇸 675 121 6ms 24 Nov 2025 904th jwonagel 675 131 386ms 3 Oct 2023 905th DrPiranoid 675 150 461ms 12 Mar 2023 905th janbehrens 🇩🇪 675 150 426ms 15 May 2023 907th MeWhenI 🇻🇦 674 124 83ms 15 Jul 2023 908th MeWhenI 🇻🇦 673 56 79ms 2 Nov 2023 909th lucky-lilypad 671 151 67ms 17 Jan 2022 910th purp 670 56 42ms 13 Aug 2022 911th lovernj 670 70 17ms 7 Feb 2022 911th trist224 🇫🇷 670 70 16ms 16 Nov 2022 911th eiburns 670 70 16ms 7 Dec 2022 911th falsidge 670 70 18ms 21 Jun 2023 911th Vaekor 670 70 17ms 9 Jul 2023 911th MaxElf999 670 70 13ms 7 Aug 2023 911th RobertHoeh 670 70 9ms 29 Mar 2024 911th tomh1012 670 70 10ms 4 Feb 2026 919th MeWhenI 🇻🇦 670 82 1,320ms 11 May 2023 920th Dadoum 670 115 470ms 3 Mar 2022 921st MeWhenI 🇻🇦 669 118 144ms 10 Oct 2023 922nd emgordon154 669 157 144ms 26 Feb 2025 923rd CaedenHarper 🇨🇦 667 30 39ms 8 days ago 924th SpareManiKatti 667 72 11ms 11 Sep 2021 924th DayDun 🇸🇪 667 72 39ms 22 Jan 2023 924th Yax42 🇫🇷 667 72 120ms 5 Sep 2025 927th sisyphus-ppcg 🇦🇺 665 101 652ms 2 Dec 2025 928th janbehrens 🇩🇪 665 133 490ms 21 Nov 2021 929th madex 🇩🇪 664 123 4ms 20 Feb 2024 930th stefangimmillaro 664 152 530ms 6 Oct 2025 931st inventshah 663 126 80ms 13 Sep 2022 932nd SirBogman 🇺🇸 662 58 461ms 20 Feb 2024 933rd emgordon154 661 84 34ms 7 Dec 2024 934th MeWhenI 🇻🇦 661 317 87ms 29 Aug 2023 935th stordev 660 71 17ms 26 Feb 2021 935th CedricGebistorf 660 71 23ms 9 Mar 2022 935th Andrewjake 660 71 18ms 16 May 2022 935th AlexanderFair 660 71 16ms 3 Aug 2023 935th griffinschreiber 660 71 9ms 3 Nov 2024 940th Shanethegamer 🇺🇸 659 87 1,360ms 18 Jan 2023 941st janbehrens 🇩🇪 659 117 616ms 1 May 2023 942nd dokutan 658 43 2,055ms 26 Mar 2023 943rd p01 658 73 13ms 25 Jul 2025 944th Lydxn 🇨🇦 656 154 429ms 15 Sep 2024 945th Shanethegamer 🇺🇸 656 160 129ms 28 Jan 2022 946th grondilu 655 43 146ms 26 Mar 2023 947th iczelia 🇩🇪 655 92 62ms 21 Sep 2025 948th msbranicky 651 67 366ms 16 Jan 2024 948th Stockoh 🇫🇷 651 67 409ms 24 Jun 2024 948th Andrey2001 651 67 420ms 25 Jan 2026 951st petar-donchev 651 72 32ms 2 Sep 2019 951st geofft 651 72 12ms 13 Dec 2020 951st SniperSmiley 🇺🇸 651 72 23ms 19 Jul 2022 951st Unknownuserfrommars 651 72 16ms 21 Nov 2024 955th Irratix 🇳🇱 651 81 119ms 16 Nov 2021 955th Shanethegamer 🇺🇸 651 81 119ms 26 May 2022 955th CatsAreFluffy 651 81 118ms 7 Dec 2022 958th Herbert00709 🇵🇱 651 155 390ms 16 days ago 959th emgordon154 650 94 2,774ms 10 May 2025 960th ktiy 650 211 1,905ms 30 May 2024 First Prev 881–960 of 3,436 Next Last