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 561st Kacarott 🇦🇺 837 45 143ms 13 Sep 2024 562nd Herbert00709 🇵🇱 837 56 19ms 5 May 2024 562nd croc54 837 56 10ms 1 Dec 2024 564th FortuiteMan 🇫🇷 836 59 8ms 12 Nov 2025 565th edsrzf 🇳🇿 836 96 129ms 3 Dec 2025 566th SirBogman 🇺🇸 834 45 36ms 29 Jan 2024 566th emgordon154 834 45 36ms 10 May 2025 568th primo-ppcg 🇹🇭 834 55 13ms 30 Jan 2022 569th emplv 🇱🇻 834 73 1,283ms 26 Jan 2023 570th emplv 🇱🇻 834 151 290ms 26 Jan 2023 571st primo-ppcg 🇹🇭 833 24 42ms 10 Dec 2022 571st saito-ta 🇯🇵 833 24 38ms 4 Aug 2023 573rd sean-niemann 🇺🇸 833 119 78ms 21 Mar 2025 574th andersk 🇺🇸 833 126 149ms 28 Nov 2022 575th tidalDisruptionEvent 🇨🇦 832 34 184ms 2 Apr 2023 576th MeWhenI 🇻🇦 830 122 57ms 15 Jul 2023 577th ovs-code 🇩🇪 829 34 113ms 4 Jan 2024 578th emgordon154 829 93 497ms 26 May 2025 579th MeWhenI 🇻🇦 829 152 283ms 10 Feb 2023 580th kg583 🇺🇸 827 106 158ms 25 Jan 2026 581st stefangimmillaro 827 127 139ms 4 Jun 2025 582nd SirBogman 🇺🇸 825 99 4ms 20 Feb 2024 582nd jared-hughes 825 99 5ms 18 Sep 2024 582nd Herbert00709 🇵🇱 825 99 7ms 4 Apr 2025 585th MeWhenI 🇻🇦 824 116 19ms 21 Jul 2023 586th neel11235813 822 31 38ms 16 Feb 2023 586th MeWhenI 🇻🇦 822 31 37ms 16 Apr 2023 586th o0lit3 🇺🇸 822 31 39ms 7 Jun 2023 589th nstearns96 🇬🇧 822 57 16ms 10 Jan 2023 589th janbehrens 🇩🇪 822 57 17ms 17 Jun 2023 589th ListeriaM 822 57 17ms 19 Aug 2023 589th FlorianCassayre 🇫🇷 822 57 12ms 18 Sep 2023 589th shelerr 822 57 16ms 9 Jan 2024 589th glassala 822 57 17ms 25 Dec 2024 589th Florian-Mt 822 57 16ms 28 Dec 2025 596th primo-ppcg 🇹🇭 820 33 152ms 6 Dec 2020 597th primo-ppcg 🇹🇭 820 67 1,333ms 25 Nov 2021 598th DialFrost 🇸🇬 819 56 28ms 24 Mar 2025 599th MeWhenI 🇻🇦 819 121 46ms 15 Jul 2023 600th GrayJoKing 🇦🇺 819 143 62ms 12 Jan 2023 601st Natanaelel 🇸🇪 816 46 42ms 20 Feb 2023 602nd inventshah 814 59 12ms 12 Jun 2022 602nd GeorgeStechman 🇬🇧 814 59 18ms 20 Jun 2022 602nd two-bad 🇬🇧 814 59 19ms 17 Dec 2023 605th btnlq 814 74 108ms 6 Nov 2022 605th sisyphus-ppcg 🇦🇺 814 74 304ms 29 Aug 2024 607th MeWhenI 🇻🇦 811 109 44ms 29 Apr 2025 608th jslip 808 35 167ms 4 Sep 2018 608th cure-honey 🇯🇵 808 35 171ms 15 Jun 2021 608th yzhs 🇩🇪 808 35 180ms 21 Jun 2022 611th guliyevemil1 🇦🇿 808 58 16ms 16 Apr 2020 611th albanian-laundromat 808 58 9ms 25 Jun 2025 613th DialFrost 🇸🇬 808 68 1,305ms 23 Aug 2024 614th m-tkach 🇺🇦 808 101 4ms 15 Dec 2022 615th namelessiw 808 125 416ms 7 Oct 2025 616th sean-niemann 🇺🇸 808 130 129ms 8 Jun 2025 617th AdrienHache 🇫🇷 804 110 453ms 16 Jan 2025 618th rambox11 801 60 10ms 5 Feb 2019 618th MeWhenI 🇻🇦 801 60 11ms 31 Jul 2023 620th CaedenHarper 🇨🇦 801 126 508ms 10 Oct 2025 621st HPWiz 🇳🇿 800 25 42ms 26 Jul 2022 622nd MeWhenI 🇻🇦 800 102 3ms 15 Jul 2023 623rd Yax42 🇫🇷 797 111 775ms 12 Jun 2024 624th MeWhenI 🇻🇦 797 135 154ms 15 Jul 2023 625th DialFrost 🇸🇬 797 263 2,926ms 22 Apr 2025 626th error256 796 69 1,245ms 23 Aug 2024 627th cure-honey 🇯🇵 796 167 68ms 11 Jul 2021 628th ovs-code 🇩🇪 796 249 3,863ms 7 Jul 2024 629th MeWhenI 🇻🇦 795 34 151ms 17 Feb 2025 630th SirBogman 🇺🇸 794 48 278ms 27 Feb 2024 631st KatieLG 🇬🇧 794 59 17ms 1 Nov 2020 631st vezzick 794 59 13ms 8 Mar 2021 631st RYNO8 794 59 16ms 8 Aug 2021 631st CarsonChr 🇺🇸 794 59 18ms 20 Sep 2022 631st cingulataluke 794 59 17ms 26 Aug 2023 631st keelimeguy 🇺🇸 794 59 17ms 6 Nov 2023 631st zwxzwxzwx21 794 59 17ms 7 Feb 2024 631st roupiq 🇵🇱 794 59 9ms 18 Apr 2024 631st HumanoidCPU 794 59 10ms 14 Aug 2024 631st jatloe 794 59 17ms 23 Aug 2024 First Prev 561–640 of 3,435 Next Last