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 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 561st SirBogman 🇺🇸 839 45 36ms 29 Jan 2024 561st emgordon154 839 45 36ms 10 May 2025 563rd croc54 839 56 10ms 1 Dec 2024 564th emplv 🇱🇻 838 73 1,283ms 26 Jan 2023 565th snoozingnewt 🇨🇦 838 86 326ms 15 days ago 566th SirBogman 🇺🇸 836 99 4ms 20 Feb 2024 566th jared-hughes 836 99 5ms 18 Sep 2024 566th Herbert00709 🇵🇱 836 99 7ms 4 Apr 2025 569th sean-niemann 🇺🇸 836 119 78ms 21 Mar 2025 570th emplv 🇱🇻 836 151 290ms 26 Jan 2023 571st andersk 🇺🇸 835 126 149ms 28 Nov 2022 572nd MeWhenI 🇻🇦 833 122 57ms 15 Jul 2023 573rd primo-ppcg 🇹🇭 832 34 152ms 6 Dec 2020 574th emgordon154 832 93 497ms 26 May 2025 575th neel11235813 830 31 38ms 16 Feb 2023 575th MeWhenI 🇻🇦 830 31 37ms 16 Apr 2023 575th o0lit3 🇺🇸 830 31 39ms 7 Jun 2023 578th FortuiteMan 🇫🇷 830 62 8ms 12 Nov 2025 579th stefangimmillaro 829 127 139ms 4 Jun 2025 580th MeWhenI 🇻🇦 827 116 19ms 21 Jul 2023 581st DialFrost 🇸🇬 826 57 28ms 24 Mar 2025 582nd primo-ppcg 🇹🇭 825 67 1,333ms 25 Nov 2021 583rd MeWhenI 🇻🇦 824 29 43ms 26 Jul 2022 583rd GrayJoKing 🇦🇺 824 29 40ms 25 Aug 2022 583rd emgordon154 824 29 41ms 16 Nov 2025 586th jmerle 🇳🇱 824 57 17ms 22 Jan 2022 586th nstearns96 🇬🇧 824 57 16ms 10 Jan 2023 586th Shanethegamer 🇺🇸 824 57 16ms 12 Feb 2023 586th Yewzir 🇧🇪 824 57 16ms 1 May 2023 586th janbehrens 🇩🇪 824 57 17ms 17 Jun 2023 586th ListeriaM 824 57 17ms 19 Aug 2023 586th shelerr 824 57 16ms 9 Jan 2024 586th SB-945 824 57 16ms 6 Feb 2024 586th starfihs 824 57 17ms 20 Jul 2024 586th glassala 824 57 17ms 25 Dec 2024 586th fkantelberg 824 57 17ms 14 Jul 2025 586th Florian-Mt 824 57 16ms 28 Dec 2025 598th MeWhenI 🇻🇦 822 121 46ms 15 Jul 2023 599th GrayJoKing 🇦🇺 822 143 62ms 12 Jan 2023 600th jslip 821 37 167ms 4 Sep 2018 600th cure-honey 🇯🇵 821 37 171ms 15 Jun 2021 600th yzhs 🇩🇪 821 37 180ms 21 Jun 2022 603rd Natanaelel 🇸🇪 821 46 42ms 20 Feb 2023 604th m-tkach 🇺🇦 820 101 4ms 15 Dec 2022 605th MeWhenI 🇻🇦 820 154 304ms 10 Feb 2023 606th MeWhenI 🇻🇦 819 88 386ms 15 Jul 2023 607th inventshah 818 59 12ms 12 Jun 2022 607th GeorgeStechman 🇬🇧 818 59 18ms 20 Jun 2022 607th two-bad 🇬🇧 818 59 19ms 17 Dec 2023 610th btnlq 818 74 108ms 6 Nov 2022 610th sisyphus-ppcg 🇦🇺 818 74 304ms 29 Aug 2024 612th MeWhenI 🇻🇦 814 109 44ms 29 Apr 2025 613th DialFrost 🇸🇬 813 68 1,305ms 23 Aug 2024 614th MeWhenI 🇻🇦 811 102 3ms 15 Jul 2023 615th namelessiw 811 126 416ms 7 Oct 2025 615th CaedenHarper 🇨🇦 811 126 508ms 10 Oct 2025 617th guliyevemil1 🇦🇿 810 58 16ms 16 Apr 2020 618th sean-niemann 🇺🇸 810 130 129ms 8 Jun 2025 619th MeWhenI 🇻🇦 808 35 151ms 17 Feb 2025 620th Yax42 🇫🇷 808 111 775ms 12 Jun 2024 620th AdrienHache 🇫🇷 808 111 453ms 16 Jan 2025 622nd rambox11 804 60 10ms 5 Feb 2019 622nd MeWhenI 🇻🇦 804 60 11ms 31 Jul 2023 624th error256 801 69 1,245ms 23 Aug 2024 625th ovs-code 🇩🇪 800 39 106ms 4 Jan 2024 625th Natanaelel 🇸🇪 800 39 115ms 16 Apr 2025 627th SirBogman 🇺🇸 800 48 278ms 27 Feb 2024 628th Shanethegamer 🇺🇸 800 56 433ms 18 Jan 2024 628th Yewzir 🇧🇪 800 56 400ms 4 Feb 2024 630th Indivicivet 799 38 170ms 30 Mar 2021 630th msbranicky 799 38 144ms 12 Jan 2024 632nd MeWhenI 🇻🇦 799 135 154ms 15 Jul 2023 633rd DialFrost 🇸🇬 799 263 2,926ms 22 Apr 2025 634th kg583 🇺🇸 798 70 13ms 23 Nov 2025 635th cure-honey 🇯🇵 798 167 68ms 11 Jul 2021 636th ovs-code 🇩🇪 798 249 3,863ms 7 Jul 2024 637th CaedenHarper 🇨🇦 796 30 39ms 8 days ago 638th andrewjc2000 796 59 12ms 12 Mar 2025 638th FortuiteMan 🇫🇷 796 59 19ms 6 Dec 2025 640th jacobly0 🇺🇸 796 174 1,676ms 18 Sep 2025 First Prev 561–640 of 3,471 Next Last