The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. Why not try and solve them ahead of time?
Rule 110 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 641st keelimeguy 🇺🇸 557 104 16ms 7 Nov 2023 642nd janbehrens 🇩🇪 557 142 386ms 10 Jul 2023 643rd MeWhenI 🇻🇦 554 113 150ms 3 Aug 2024 644th madeforlosers 554 127 12ms 5 hours ago 645th bac0id 554 192 437ms 28 Jun 2024 646th aaronze 🇦🇺 553 98 40ms 20 Sep 2023 647th Shanethegamer 🇺🇸 553 143 377ms 9 Apr 2025 648th jacobly0 🇺🇸 552 249 1,798ms 22 Apr 2024 649th roguh 🇬🇹 551 221 27ms 22 Feb 2024 650th MeWhenI 🇻🇦 549 169 134ms 15 Oct 2022 651st Jacob385 548 194 465ms 10 Nov 2025 652nd cmayer777 547 141 6ms 21 Oct 2022 653rd dokutan 547 174 2,865ms 4 Apr 2025 654th EnTerr 546 106 15ms 1 Sep 2024 655th juliansiebert 🇩🇪 545 115 383ms 19 Dec 2023 656th ToriTheChicken 545 129 13ms 31 Jul 2020 656th olleicua 🇺🇸 545 129 12ms 9 Sep 2025 658th janbehrens 🇩🇪 544 175 1,423ms 20 Nov 2022 658th aksyristos 544 175 470ms 30 Jan 2023 660th dokutan 543 142 6ms 4 Apr 2025 661st akshatj27 🇦🇶 542 100 40ms 12 Dec 2022 662nd TheAristos 541 107 10ms 23 Oct 2019 662nd mathisfun271 541 107 11ms 16 Dec 2023 664th hyvyys 541 130 10ms 14 Sep 2020 665th Gaddy 🇫🇷 541 146 390ms 20 May 2022 665th annaproxy 541 146 402ms 22 Jun 2023 667th Heathcorp 🇦🇺 539 143 6ms 18 Feb 2022 667th snoozingnewt 🇨🇦 539 143 6ms 23 Sep 2023 667th neel11235813 539 143 6ms 5 Apr 2024 667th FortuiteMan 🇫🇷 539 143 6ms 10 Oct 2024 667th Lv0Sys 🇵🇱 539 143 6ms 1 Jun 2025 672nd Laksen 🇩🇰 537 241 27ms 8 Jul 2021 673rd dokutan 536 108 28ms 9 Jul 2024 673rd ahmetdemirag 🇨🇾 536 108 34ms 5 Mar 2025 673rd RaBa21 🇭🇺 536 108 13ms 12 Jul 2025 676th AlephSquirrel 535 144 6ms 12 Dec 2022 677th JOrE20 535 242 25ms 12 Feb 2026 678th scpchicken 🇵🇼 534 79 9ms 1 Jan 2023 679th jgbaldwinbrown 534 237 272ms 2 Jul 2021 680th jerrandolph 532 238 301ms 23 Apr 2020 681st nullie 531 109 17ms 15 Jun 2022 681st Exaphis 531 109 12ms 11 Jul 2022 683rd rvdnieuwendijk 🇳🇱 531 118 284ms 23 Jul 2020 684th MeWhenI 🇻🇦 530 195 3ms 31 Dec 2022 685th rodigu 529 133 11ms 14 Jun 2021 685th snoozingnewt 🇨🇦 529 133 11ms 11 Oct 2025 687th janbehrens 🇩🇪 528 110 683ms 10 Nov 2021 688th neihousaigaai 527 110 11ms 18 May 2021 688th logvp 527 110 130ms 8 Jan 2024 688th Bmrl7 527 110 13ms 21 Feb 2024 688th stertooy 🇧🇪 527 110 12ms 19 Jun 2024 688th Pyroan 527 110 11ms 12 Mar 2025 688th YAJUE114514 527 110 11ms 19 Dec 2025 694th junkondo-jp 525 134 13ms 24 Jan 2026 695th dokutan 524 114 1,800ms 30 Aug 2025 696th scpchicken 🇵🇼 524 150 160ms 28 Feb 2023 697th MeWhenI 🇻🇦 523 111 323ms 14 Feb 2023 698th ChristophHornung 523 151 403ms 21 Nov 2021 699th MeWhenI 🇻🇦 523 177 4ms 11 Sep 2022 700th daedals 522 111 10ms 24 Apr 2019 700th amollberg 🇸🇪 522 111 10ms 18 Jan 2022 700th commandz0 🇺🇸 522 111 11ms 1 Oct 2022 703rd tobeannouncd 521 151 125ms 5 Jan 2024 704th dokutan 520 107 390ms 14 Feb 2026 705th Shanethegamer 🇺🇸 520 196 49ms 4 Oct 2024 706th vezzick 517 112 16ms 8 Mar 2021 707th KatieLG 🇬🇧 517 113 27ms 10 Oct 2025 708th violeta-desantis 517 149 6ms 31 Aug 2023 709th revlayle 🇺🇸 517 153 390ms 28 Dec 2021 710th GrayJoKing 🇦🇺 515 82 9ms 2 Apr 2023 711th roguh 🇬🇹 515 108 599ms 22 Feb 2024 712th myleopard 513 113 18ms 15 Oct 2021 712th CedricGebistorf 513 113 10ms 19 Feb 2022 712th betaveros 513 113 13ms 1 Jan 2023 712th scpchicken 🇵🇼 513 113 12ms 28 Feb 2023 712th janbehrens 🇩🇪 513 113 17ms 17 Jun 2023 712th fourth-bit 513 113 20ms 11 Nov 2024 712th nemoyatpeace 513 113 11ms 15 Jan 2026 719th commandz0 🇺🇸 511 109 542ms 1 Sep 2025 720th retrohun 511 186 76ms 28 Dec 2022 First Prev 641–720 of 1,659 Next Last