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 877th Matistjati 691 68 16ms 2 Dec 2019 877th jmhowl 691 68 17ms 19 Jan 2020 877th OllieBoyne 🇬🇧 691 68 16ms 4 Jul 2020 877th forlack 691 68 16ms 8 Nov 2021 877th aiarzhantsev 691 68 18ms 14 Oct 2022 877th jtaxen 691 68 17ms 4 Jan 2023 877th atazzam 🇺🇸 691 68 17ms 5 Mar 2023 877th crispshaker 691 68 17ms 18 Mar 2023 877th roupiq 🇵🇱 691 68 17ms 18 Apr 2024 877th ei14 691 68 9ms 7 May 2024 891st anter69 🇭🇺 691 80 1,260ms 17 Feb 2026 892nd puyuliao 691 147 444ms 24 Oct 2023 893rd ArmaanAS 689 70 11ms 1 Apr 2021 893rd Shanethegamer 🇺🇸 689 70 11ms 26 May 2022 895th MeWhenI 🇻🇦 688 88 59ms 15 Jul 2023 896th rucin93 🇵🇱 688 153 130ms 25 Aug 2024 897th sk- 687 55 44ms 12 Sep 2019 897th pilaf 🇦🇷 687 55 42ms 14 Apr 2022 899th prplz 🇦🇺 686 56 525ms 14 Jun 2020 900th madex 🇩🇪 686 105 220ms 15 Sep 2025 901st jslip 684 56 23ms 8 Sep 2018 902nd Irratix 🇳🇱 684 121 3ms 25 Dec 2021 902nd prestosilver 🇺🇸 684 121 6ms 24 Nov 2025 904th jwonagel 684 131 386ms 3 Oct 2023 905th ktiy 684 154 131ms 11 Apr 2022 906th SniperSmiley 🇺🇸 683 35 467ms 9 Nov 2022 906th AlephSquirrel 683 35 40ms 10 Feb 2023 908th knutae 🇳🇴 681 69 11ms 29 Nov 2021 908th inverseLorentz 🇦🇺 681 69 13ms 8 Oct 2023 908th CutSandstone 681 69 11ms 3 Jul 2024 908th cros107 🇦🇺 681 69 10ms 30 Dec 2024 912th MeWhenI 🇻🇦 679 56 79ms 2 Nov 2023 913th cure-honey 🇯🇵 679 142 148ms 23 Jun 2021 914th sisyphus-ppcg 🇦🇺 678 46 361ms 30 Jan 2023 915th MeWhenI 🇻🇦 677 124 83ms 15 Jul 2023 916th DrPiranoid 677 150 461ms 12 Mar 2023 916th janbehrens 🇩🇪 677 150 426ms 15 May 2023 918th dokutan 675 45 2,055ms 26 Mar 2023 919th purp 674 56 42ms 13 Aug 2022 920th MeWhenI 🇻🇦 674 82 1,320ms 11 May 2023 921st janbehrens 🇩🇪 674 133 490ms 21 Nov 2021 922nd Dadoum 673 115 470ms 3 Mar 2022 923rd madex 🇩🇪 673 123 4ms 20 Feb 2024 924th lucky-lilypad 673 151 67ms 17 Jan 2022 925th MeWhenI 🇻🇦 672 118 144ms 10 Oct 2023 926th lovernj 671 70 17ms 7 Feb 2022 926th trist224 🇫🇷 671 70 16ms 16 Nov 2022 926th eiburns 671 70 16ms 7 Dec 2022 926th falsidge 671 70 18ms 21 Jun 2023 926th Vaekor 671 70 17ms 9 Jul 2023 926th MaxElf999 671 70 13ms 7 Aug 2023 926th RobertHoeh 671 70 9ms 29 Mar 2024 926th tomh1012 671 70 10ms 4 Feb 2026 934th emgordon154 671 157 126ms 26 Feb 2025 935th SpareManiKatti 670 72 11ms 11 Sep 2021 935th DayDun 🇸🇪 670 72 39ms 22 Jan 2023 935th Yax42 🇫🇷 670 72 120ms 5 Sep 2025 938th SirBogman 🇺🇸 669 58 461ms 20 Feb 2024 939th KatieLG 🇬🇧 669 67 445ms 15 Jan 2024 939th msbranicky 669 67 366ms 16 Jan 2024 939th Stockoh 🇫🇷 669 67 409ms 24 Jun 2024 939th HumanoidCPU 669 67 472ms 14 Aug 2024 939th Andrey2001 669 67 420ms 25 Jan 2026 944th stefangimmillaro 668 153 530ms 6 Oct 2025 945th KasperKivimaeki 🇫🇮 667 108 456ms 25 Nov 2024 946th MeWhenI 🇻🇦 667 893 4ms 25 Dec 2025 947th inventshah 666 126 80ms 13 Sep 2022 948th emgordon154 665 84 34ms 7 Dec 2024 949th Shanethegamer 🇺🇸 663 87 1,360ms 18 Jan 2023 950th MeWhenI 🇻🇦 663 317 87ms 29 Aug 2023 951st stordev 662 71 17ms 26 Feb 2021 951st CedricGebistorf 662 71 23ms 9 Mar 2022 951st Andrewjake 662 71 18ms 16 May 2022 951st AlexanderFair 662 71 16ms 3 Aug 2023 951st griffinschreiber 662 71 9ms 3 Nov 2024 956th janbehrens 🇩🇪 662 117 616ms 1 May 2023 957th p01 661 73 13ms 25 Jul 2025 958th Lydxn 🇨🇦 659 155 429ms 15 Sep 2024 958th Herbert00709 🇵🇱 659 155 390ms 15 days ago 960th iczelia 🇩🇪 658 92 62ms 21 Sep 2025 First Prev 881–960 of 3,473 Next Last