The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. 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 881st ehulinsky 🇺🇸 448 153 396ms 10 Nov 2021 881st mokymok 🇺🇸 448 153 17ms 15 Nov 2021 883rd keelimeguy 🇺🇸 446 288 299ms 2 Jun 2025 884th Natanaelel 🇸🇪 444 180 6ms 14 May 2023 885th Attero 🇸🇪 443 183 409ms 21 Nov 2021 886th hjcafaroUC 442 155 10ms 1 Aug 2020 886th AkashTandon167 442 155 247ms 20 Jan 2021 888th roguh 🇬🇹 442 181 6ms 8 Jan 2024 889th eranws 441 164 10ms 17 Oct 2022 890th rucin93 🇵🇱 440 250 425ms 28 Nov 2023 891st orthoplex 🇨🇽 440 367 25ms 9 Jun 2024 892nd Stockoh 🇫🇷 439 156 33ms 31 Oct 2024 892nd jameswmccarty 439 156 18ms 6 Mar 2025 894th dokutan 438 141 1,205ms 30 Aug 2025 895th msbranicky 437 231 143ms 1 Jan 2024 896th aDwarfNamedUrist 437 241 3ms 6 Dec 2022 897th aalec 436 157 11ms 4 May 2024 898th two-bad 🇬🇧 436 166 10ms 25 Feb 2024 899th lacroixjonathan87 435 170 5ms 6 Sep 2020 900th keelimeguy 🇺🇸 433 158 16ms 7 Nov 2023 900th wobblybits 433 158 48ms 16 Aug 2025 902nd zakariamouhid 433 167 21ms 14 Jun 2023 903rd hamhub7 433 187 417ms 17 Aug 2022 904th cafehaine 🇫🇷 433 243 3ms 5 Feb 2020 905th za3k 431 159 10ms 10 Oct 2022 906th mintypython 431 168 12ms 21 Sep 2019 906th AnnoyedArt1256 431 168 10ms 9 Jan 2022 906th madeforlosers 431 168 11ms 3 Nov 2025 909th dokutan 431 234 150ms 22 Dec 2024 910th n1LS 429 133 42ms 27 Sep 2019 911th trist224 🇫🇷 428 160 11ms 15 Sep 2022 912th MossGrass 🇺🇸 427 258 436ms 16 Oct 2020 913th MeWhenI 🇻🇦 426 213 447ms 10 Feb 2025 914th mothcolada 🇺🇸 425 161 12ms 15 Dec 2020 914th Andrey135296 425 161 20ms 24 Oct 2022 914th Andrey2001 425 161 13ms 22 hours ago 917th laserb 421 149 376ms 26 Jan 2020 918th befoster 420 163 11ms 8 May 2021 918th LeeCamp 420 163 27ms 10 Dec 2021 920th RandGuy 420 193 392ms 31 Mar 2022 921st Kusarr 420 262 425ms 17 Dec 2020 922nd pyrolitic 🇮🇪 419 191 6ms 4 Apr 2022 923rd msbranicky 419 218 2,622ms 9 Jan 2025 924th jiaminglimjm 🇲🇾 418 164 12ms 9 Jan 2021 924th KadinSchultz 418 164 18ms 18 Dec 2023 924th islptng 418 164 21ms 30 Aug 2025 924th AidanWalter 418 164 19ms 27 Nov 2025 928th dsntzn 🇸🇰 418 173 10ms 2 Mar 2021 929th aksyristos 415 165 15ms 20 Jan 2023 929th dokutan 415 165 28ms 9 Jul 2024 929th RaBa21 🇭🇺 415 165 14ms 19 Jul 2025 932nd c0d3-4-F00d 🇩🇪 415 193 6ms 21 Jan 2022 933rd connorslade 412 239 166ms 13 May 2022 934th Reyzartz 408 168 13ms 19 Sep 2020 934th Pena86 408 168 19ms 4 Jan 2022 936th dokutan 408 181 137ms 23 Apr 2025 937th galloj 🇨🇿 407 134 13ms 17 Jan 2023 938th aliakseikalosha 407 199 407ms 18 Jul 2025 939th RandGuy 405 169 26ms 4 May 2022 939th TaserTheFox 🇺🇸 405 169 18ms 1 May 2023 941st jjatria 403 144 161ms 11 Jul 2020 941st scpchicken 🇵🇼 403 144 235ms 29 Mar 2022 943rd croc54 403 170 11ms 16 Dec 2024 944th alphafalfa 403 183 9ms 1 Aug 2025 945th mikehanus 402 199 6ms 21 Nov 2023 946th dokutan 400 164 604ms 9 Jul 2024 947th bobbysq 400 171 12ms 16 Nov 2023 948th kellantech 398 172 31ms 31 May 2023 949th janbehrens 🇩🇪 397 133 5ms 14 May 2021 950th snoozingnewt 🇨🇦 397 182 15ms 11 Oct 2025 951st postie77 397 204 389ms 14 Jun 2023 952nd brimstonetrader 396 173 15ms 19 Dec 2023 953rd WillowWispy 394 174 13ms 23 Mar 2025 954th Pimentero 🇷🇺 393 188 6ms 17 Apr 2024 955th rjmholt 392 165 313ms 3 Jun 2020 956th ianpoe 391 175 11ms 30 Apr 2020 957th KatieLG 🇬🇧 391 185 14ms 11 Jun 2024 958th martinnorling 🇸🇪 389 176 20ms 24 Feb 2022 959th MeWhenI 🇻🇦 389 250 467ms 7 Dec 2022 960th CaedenHarper 🇨🇦 388 284 523ms 10 Oct 2025 First Prev 881–960 of 1,669 Next Last