The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. Why not try and solve them ahead of time?
Rule 110 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 641st emgordon154 572 176 10ms 10 days ago 642nd sambirnbaum1 571 120 12ms 29 Oct 2019 642nd boxjelly 571 120 13ms 17 Jan 2021 644th cywong-amino 🇭🇰 570 127 14ms 7 Oct 2020 645th funnsam 🇭🇰 569 173 138ms 12 Aug 2024 646th MeWhenI 🇻🇦 567 143 406ms 19 Jun 2025 647th janbehrens 🇩🇪 567 160 472ms 15 Nov 2022 648th quimey 566 121 18ms 23 Aug 2023 648th StefanHabel 🇨🇦 566 121 10ms 21 days ago 650th msbranicky 566 167 9ms 3 Oct 2024 651st guliyevemil1 🇦🇿 566 227 293ms 16 Apr 2020 652nd bac0id 563 144 407ms 4 Jul 2024 653rd bac0id 562 196 437ms 28 Jun 2024 653rd Jacob385 562 196 465ms 10 Nov 2025 655th msbranicky 561 229 299ms 30 Aug 2023 656th akshatj27 🇦🇶 560 102 40ms 12 Dec 2022 656th aaronze 🇦🇺 560 102 40ms 20 Sep 2023 658th janbehrens 🇩🇪 560 112 683ms 10 Nov 2021 659th cmayer777 559 143 6ms 21 Oct 2022 660th daedals 557 123 10ms 24 Apr 2019 660th schachmattmatt 557 123 15ms 12 Aug 2021 660th Indivicivet 557 123 17ms 22 Oct 2021 660th FortuiteMan 🇫🇷 557 123 19ms 17 Sep 2023 660th jtaxen 557 123 19ms 8 Jun 2024 660th andrewjc2000 557 123 13ms 8 Mar 2025 666th XenThe 🇬🇧 556 130 15ms 14 Jul 2025 667th dokutan 556 144 6ms 4 Apr 2025 668th jacobly0 🇺🇸 556 251 1,798ms 22 Apr 2024 669th MeWhenI 🇻🇦 555 113 323ms 14 Feb 2023 670th roguh 🇬🇹 555 223 27ms 22 Feb 2024 671st juliansiebert 🇩🇪 553 117 383ms 19 Dec 2023 672nd thisishowmymindworks 🇳🇴 552 124 11ms 5 Oct 2020 672nd knutae 🇳🇴 552 124 13ms 3 Dec 2021 672nd AGoyet 552 124 13ms 16 Jul 2022 672nd GodlyProgrammer1 552 124 12ms 21 Nov 2025 676th Heathcorp 🇦🇺 552 145 6ms 18 Feb 2022 676th snoozingnewt 🇨🇦 552 145 6ms 23 Sep 2023 676th neel11235813 552 145 6ms 5 Apr 2024 676th FortuiteMan 🇫🇷 552 145 6ms 10 Oct 2024 676th Lv0Sys 🇵🇱 552 145 6ms 1 Jun 2025 681st dokutan 552 176 2,865ms 4 Apr 2025 682nd Shanethegamer 🇺🇸 551 147 377ms 9 Apr 2025 683rd janbehrens 🇩🇪 549 177 1,423ms 20 Nov 2022 683rd aksyristos 549 177 449ms 30 Jan 2023 685th nemoyatpeace 548 125 11ms 15 Jan 2026 686th hyvyys 548 132 10ms 14 Sep 2020 687th AlephSquirrel 548 146 6ms 12 Dec 2022 688th Gaddy 🇫🇷 548 148 390ms 20 May 2022 689th roguh 🇬🇹 547 120 599ms 22 Feb 2024 690th Shanethegamer 🇺🇸 545 148 134ms 20 May 2022 691st emgordon154 544 136 143ms 24 Sep 2024 692nd mossprescott 543 126 12ms 18 Jan 2023 692nd guilhem-roy 🇫🇷 543 126 16ms 26 Jun 2023 694th Laksen 🇩🇰 541 243 27ms 8 Jul 2021 695th jbt 540 134 14ms 26 Dec 2023 696th janbehrens 🇩🇪 540 150 407ms 17 Jun 2023 697th JRaspass 🇬🇧 539 98 4ms 20 Dec 2022 698th smartiel 539 127 18ms 16 Sep 2022 698th CutSandstone 539 127 16ms 5 Jul 2024 698th jatloe 539 127 34ms 2 Oct 2024 701st MeWhenI 🇻🇦 539 176 132ms 15 Oct 2022 702nd Yewzir 🇧🇪 539 225 65ms 5 Apr 2024 703rd JOrE20 539 244 25ms 12 Feb 2026 704th jgbaldwinbrown 538 239 272ms 2 Jul 2021 705th alexkunin 536 135 12ms 3 Jul 2019 705th rodigu 536 135 11ms 14 Jun 2021 705th olleicua 🇺🇸 536 135 12ms 9 Sep 2025 708th jerrandolph 536 240 301ms 23 Apr 2020 709th bastienvoirin 🇫🇷 535 128 17ms 28 Nov 2020 709th lemogne 535 128 19ms 10 Aug 2021 709th NicoAdams 535 128 11ms 22 Nov 2021 709th NerdyMcNerd42 535 128 11ms 27 Oct 2022 709th adamnielson42 🇺🇸 535 128 220ms 4 May 2023 709th ThijsLuttikhuis 535 128 20ms 3 Mar 2024 709th Mabeloid 🇳🇴 535 128 15ms 22 Sep 2024 709th alemelis 535 128 19ms 17 Oct 2024 709th kistlerf 🇨🇭 535 128 14ms 28 May 2025 718th MeWhenI 🇻🇦 535 197 3ms 31 Dec 2022 719th BBoehm 🇩🇪 532 136 17ms 10 Nov 2020 719th junkondo-jp 532 136 13ms 24 Jan 2026 First Prev 641–720 of 1,671 Next Last
