The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
DFA Simulator in Python 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 81st bpharaldsson 505 196 12ms 13 Feb 2026 82nd klixel 🇨🇦 503 197 11ms 19 Jul 2025 82nd Babafaba 503 197 14ms 17 Nov 2025 82nd vhoulbreque 🇫🇷 503 197 11ms 26 Nov 2025 85th Bmrl7 500 198 12ms 23 Nov 2025 86th StefanHabel 🇨🇦 493 201 14ms 10 days ago 87th Code-Coder-coder 490 202 13ms 9 Feb 2026 88th Pyroan 481 206 12ms 12 Mar 2025 89th hiichbindermax 469 211 11ms 20 Nov 2023 89th thienudomsrirungruang 469 211 11ms 1 Apr 2024 91st YAJUE114514 465 213 10ms 10 Dec 2025 92nd VictorFordham 460 215 13ms 24 Nov 2023 93rd CaedenHarper 🇨🇦 454 218 18ms 21 Sep 2025 94th amollberg 🇸🇪 450 220 12ms 14 Jan 2024 95th jtaxen 430 230 12ms 8 Jun 2024 96th alemelis 423 234 32ms 11 Oct 2024 97th croc54 419 236 11ms 17 Dec 2024 98th fgrosshans 🇫🇷 414 239 13ms 7 Nov 2023 99th jameswmccarty 413 240 12ms 24 Feb 2025 99th Heathcorp 🇦🇺 413 240 11ms 12 Aug 2025 101st adoxography 411 241 12ms 19 Nov 2023 102nd tomh1012 402 246 12ms 25 days ago 103rd neihousaigaai 401 247 12ms 7 Oct 2024 104th galloj 🇨🇿 390 254 11ms 24 Nov 2023 104th MaxElf999 390 254 13ms 9 Feb 2024 106th logvp 379 261 12ms 6 Oct 2024 107th za3k 378 262 12ms 22 Jul 2025 108th BREMAUCY 🇫🇷 367 270 13ms 21 Aug 2025 109th FortuiteMan 🇫🇷 364 272 13ms 14 Oct 2024 110th alexjurkiewicz 🇦🇺 360 275 12ms 14 Nov 2023 111th FranklinJiaChen 356 278 13ms 4 Jul 2024 112th TheZwierzLF 🇵🇱 346 286 32ms 5 Jan 2026 113th jelleromer 341 290 25ms 19 Nov 2023 114th nemoyatpeace 333 297 21ms 29 Dec 2025 114th Lv0Sys 🇵🇱 333 297 12ms 24 Feb 2026 116th msbranicky 332 298 12ms 1 Nov 2023 117th mbittner20 331 299 11ms 12 Feb 2024 118th haighd 324 306 12ms 21 Nov 2023 119th madex 🇩🇪 319 310 12ms 8 Oct 2025 120th RZ781 294 337 12ms 19 Nov 2023 121st AstroOrbis 286 346 12ms 13 days ago 122nd jensdewaard 266 372 15ms 19 Nov 2023 123rd DialFrost 🇸🇬 246 402 14ms 1 Nov 2023 124th muser-logiccpu 🇺🇦 196 506 12ms 5 Aug 2025 125th Zhenyu-Bo 170 581 12ms 31 Jul 2025 126th kevinnaviapaiva 167 593 12ms 26 Feb 2025 127th zt14427 151 654 14ms 11 Feb 2025 128th AidanWalter 40 2,447 13ms 8 Feb 2025 First Prev 81–128 of 128
