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 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 561st Natanaelel 🇸🇪 608 94 1,317ms 6 Aug 2023 562nd lionbryce 608 170 4ms 8 Aug 2024 563rd marcin7Cd 607 168 114ms 8 Feb 2021 564th rambox11 606 116 12ms 6 Dec 2019 564th coreynash 606 116 12ms 19 Feb 2024 566th HumanoidCPU 605 92 415ms 17 Feb 2025 567th firegene 🇮🇪 603 96 11ms 16 days ago 568th SirBogman 🇺🇸 603 363 18ms 23 Nov 2022 569th lynn 602 128 6ms 21 Mar 2022 570th PatrickStephansen 🇿🇦 601 117 12ms 8 Mar 2021 571st DialFrost 🇸🇬 601 177 405ms 19 Nov 2025 572nd orthoplex 🇨🇽 600 66 33ms 27 Feb 2020 573rd inventshah 598 82 8ms 11 Sep 2022 574th yzhs 🇩🇪 597 97 18ms 25 Oct 2020 574th wh3n3v3r 🇨🇿 597 97 18ms 20 Nov 2024 574th JunkIce 597 97 18ms 24 Jan 2025 574th ryyyn 🇺🇸 597 97 15ms 5 Nov 2025 578th MateuszPietrzak 🇵🇱 595 160 444ms 11 Jan 2024 579th Shanethegamer 🇺🇸 595 162 128ms 27 Feb 2023 579th klixel 🇨🇦 595 162 124ms 10 May 2023 581st primo-ppcg 🇹🇭 594 179 436ms 14 Jul 2020 582nd retrohun 593 121 5ms 12 Nov 2022 583rd MeWhenI 🇻🇦 593 179 4ms 24 Jul 2023 584th qpwoeirut 591 98 11ms 11 Aug 2025 585th omurakazuaki 🇯🇵 591 119 11ms 15 Mar 2021 585th alexsave 591 119 10ms 4 Nov 2025 587th tatzyr 🇯🇵 589 92 69ms 10 Dec 2024 587th denkyuu1 589 92 45ms 19 days ago 589th Shanethegamer 🇺🇸 589 97 1,307ms 27 Feb 2023 590th janAkali 🇷🇺 589 175 364ms 16 Nov 2025 591st tsunderu 🇯🇵 588 131 6ms 25 Aug 2021 591st Mandrzejy 🇵🇱 588 131 6ms 27 Feb 2024 593rd Shanethegamer 🇺🇸 587 63 6ms 6 Feb 2022 594th o0lit3 🇺🇸 586 72 12ms 3 Oct 2020 595th MeWhenI 🇻🇦 586 208 106ms 7 Jun 2023 596th roguh 🇬🇹 585 99 12ms 22 Feb 2024 597th proton 🇩🇪 583 93 44ms 10 Jun 2020 597th razetime 583 93 40ms 25 Jan 2021 597th olivermrose 🇺🇸 583 93 41ms 24 Oct 2021 597th scpchicken 🇵🇼 583 93 42ms 22 Apr 2023 601st anter69 🇭🇺 583 98 1,290ms 24 Feb 2023 602nd UnderKoen 🇳🇱 582 271 35ms 20 Jan 2025 603rd thisishowmymindworks 🇳🇴 581 121 13ms 15 Aug 2020 603rd XenThe 🇬🇧 581 121 11ms 1 Jul 2025 605th Shanethegamer 🇺🇸 581 223 25ms 25 Mar 2022 606th Indivicivet 580 133 6ms 16 Mar 2021 607th Shanethegamer 🇺🇸 578 136 134ms 20 May 2022 608th janbehrens 🇩🇪 578 184 460ms 15 Nov 2022 609th MeWhenI 🇻🇦 577 156 42ms 2 Jun 2024 610th jbt 576 122 14ms 26 Dec 2023 611th TimCurwick 🇺🇸 575 109 268ms 30 Jul 2020 612th JunkIce 574 97 454ms 24 Jan 2025 613th SirBogman 🇺🇸 574 137 181ms 27 Nov 2021 614th RockOfStone 574 180 3ms 10 Mar 2024 615th abailey2020 🇺🇸 573 101 11ms 12 Dec 2020 615th marcin7Cd 573 101 19ms 16 Dec 2020 615th fgrosshans 🇫🇷 573 101 19ms 22 Jul 2024 615th AstroOrbis 573 101 10ms 11 Feb 2026 619th alexkunin 572 123 12ms 3 Jul 2019 620th MeWhenI 🇻🇦 570 126 11ms 3 Jul 2023 621st cmayer777 570 167 60ms 21 Oct 2022 622nd ian-h-chamberlain 🇺🇸 570 169 133ms 8 Oct 2020 623rd edsrzf 🇳🇿 570 176 1,343ms 29 Apr 2025 624th Alex-x90 🇺🇸 570 222 288ms 19 Sep 2024 625th leon-w 568 102 12ms 4 Jan 2019 626th BBoehm 🇩🇪 567 124 17ms 10 Nov 2020 627th emgordon154 567 174 10ms 5 days ago 628th iczelia 🇩🇪 566 139 141ms 19 Oct 2025 629th bac0id 565 140 407ms 4 Jul 2024 630th funnsam 🇭🇰 564 171 134ms 12 Aug 2024 631st galloj 🇨🇿 562 103 11ms 24 Jan 2021 631st luuumine 🇫🇷 562 103 11ms 17 Oct 2025 633rd guliyevemil1 🇦🇿 562 225 293ms 16 Apr 2020 634th MeWhenI 🇻🇦 561 141 406ms 19 Jun 2025 635th janbehrens 🇩🇪 561 158 472ms 15 Nov 2022 636th msbranicky 561 165 9ms 3 Oct 2024 637th msbranicky 558 227 299ms 30 Aug 2023 638th keelimeguy 🇺🇸 557 104 16ms 7 Nov 2023 639th janbehrens 🇩🇪 557 142 386ms 10 Jul 2023 640th MeWhenI 🇻🇦 554 113 150ms 3 Aug 2024 First Prev 561–640 of 1,657 Next Last