The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 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 881st rucin93 🇵🇱 429 248 425ms 28 Nov 2023 882nd lacroixjonathan87 428 168 5ms 6 Sep 2020 883rd hamhub7 427 185 417ms 17 Aug 2022 884th amishtal 426 136 18ms 30 Nov 2019 885th zakariamouhid 426 165 20ms 14 Jun 2023 886th AnnoyedArt1256 424 166 11ms 9 Jan 2022 887th feherd 423 137 11ms 29 Aug 2021 887th TheZwierzLF 🇵🇱 423 137 14ms 14 Dec 2025 889th decorator-factory 420 138 11ms 23 May 2019 889th aalec 420 138 11ms 4 May 2024 889th msbranicky 420 138 18ms 3 Oct 2024 892nd MeWhenI 🇻🇦 420 211 447ms 10 Feb 2025 893rd Jviscus1 417 139 41ms 24 Apr 2020 893rd Psirving 417 139 12ms 1 Aug 2020 895th dijs 416 169 11ms 21 Dec 2019 896th MossGrass 🇺🇸 415 256 436ms 16 Oct 2020 897th RandGuy 414 191 392ms 31 Mar 2022 898th msbranicky 414 216 2,622ms 9 Jan 2025 899th PaulMWeiser 411 141 417ms 4 Mar 2023 899th rsgray 411 141 11ms 24 Jan 2024 899th itljan30 411 141 11ms 30 Jan 2025 902nd dsntzn 🇸🇰 411 171 10ms 2 Mar 2021 903rd galloj 🇨🇿 409 120 13ms 17 Jan 2023 904th Kusarr 409 260 425ms 17 Dec 2020 905th inverseLorentz 🇦🇺 408 142 348ms 29 Apr 2024 905th hellwue 408 142 15ms 25 Jun 2024 907th pyrolitic 🇮🇪 408 189 6ms 4 Apr 2022 908th connorslade 407 237 165ms 13 May 2022 909th SniperSmiley 🇺🇸 405 143 22ms 24 Jun 2022 909th MaxElf999 405 143 12ms 3 Oct 2022 909th SirFireball3521 405 143 12ms 4 Feb 2023 912th c0d3-4-F00d 🇩🇪 404 191 6ms 21 Jan 2022 913th msbranicky 403 138 562ms 3 Oct 2024 914th aliakseikalosha 401 197 407ms 18 Jul 2025 915th nooberitess 399 145 25ms 22 May 2025 916th guliyevemil1 🇦🇿 397 146 10ms 16 Apr 2020 916th trist224 🇫🇷 397 146 11ms 15 Sep 2022 916th Emutis 🇱🇹 397 146 11ms 9 Nov 2025 919th alphafalfa 397 181 9ms 1 Aug 2025 920th laserb 395 147 376ms 26 Jan 2020 921st AforAmpere 394 147 13ms 21 Feb 2021 921st Anonymousellama21 394 147 11ms 7 Mar 2024 923rd MeWhenI 🇻🇦 392 189 8ms 1 Oct 2022 924th zdzc 391 148 11ms 25 Apr 2019 925th mikehanus 391 197 6ms 21 Nov 2023 926th postie77 391 202 389ms 14 Jun 2023 927th matanshavit 389 149 15ms 5 May 2020 927th aglahir1 389 149 19ms 20 Jul 2022 929th Starwort 🇬🇧 386 150 11ms 5 Apr 2019 929th ay2718 386 150 11ms 8 Aug 2019 929th jiaminglimjm 🇲🇾 386 150 12ms 9 Jan 2021 932nd Pimentero 🇷🇺 386 186 6ms 17 Apr 2024 933rd MeWhenI 🇻🇦 385 222 69ms 3 Nov 2023 934th ehulinsky 🇺🇸 384 151 396ms 10 Nov 2021 934th QuincyNash 🇺🇸 384 151 19ms 19 Jan 2022 934th mikehanus 384 151 32ms 21 Nov 2023 937th rjmholt 384 163 313ms 3 Jun 2020 938th KatieLG 🇬🇧 384 183 10ms 11 Jun 2024 939th MeWhenI 🇻🇦 384 248 465ms 7 Dec 2022 940th MeWhenI 🇻🇦 380 189 9ms 4 Nov 2022 941st scpchicken 🇵🇼 379 132 261ms 29 Mar 2022 942nd hjcafaroUC 379 153 10ms 1 Aug 2020 942nd AkashTandon167 379 153 247ms 20 Jan 2021 944th CaedenHarper 🇨🇦 377 282 523ms 10 Oct 2025 945th Stockoh 🇫🇷 376 154 33ms 31 Oct 2024 945th jameswmccarty 376 154 18ms 6 Mar 2025 947th tofuweasel 375 167 308ms 10 Jun 2022 948th jgbaldwinbrown 374 206 6ms 2 Jul 2021 949th MeWhenI 🇻🇦 374 585 20ms 15 Nov 2023 950th amazingalek 🇳🇴 373 212 509ms 26 Jan 2026 951st wobblybits 371 156 48ms 16 Aug 2025 952nd boxjelly 370 287 433ms 3 Mar 2021 953rd za3k 369 157 10ms 10 Oct 2022 953rd KadinSchultz 369 157 18ms 4 days ago 955th fleischa 369 214 368ms 21 Nov 2021 956th TrixTrl 368 289 421ms 15 Nov 2021 957th MeWhenI 🇻🇦 366 169 1,145ms 22 May 2023 958th mothcolada 🇺🇸 364 159 12ms 15 Dec 2020 958th Andrey135296 364 159 20ms 24 Oct 2022 958th Andrey2001 364 159 13ms 6 days ago First Prev 881–960 of 1,659 Next Last