The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
DFA Simulator 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 321st helbling 🇨🇭 702 163 10ms 23 Sep 2024 322nd emgordon154 702 392 1,655ms 10 Jan 2026 323rd StefanHabel 🇨🇦 700 201 14ms 10 days ago 324th h3ra993huskp 🇯🇵 698 272 482ms 30 Nov 2025 325th snoozingnewt 🇨🇦 697 174 339ms 27 Nov 2025 326th SB-945 697 202 12ms 28 Jan 2024 326th Artemis21 🇬🇧 697 202 32ms 24 Dec 2024 326th Code-Coder-coder 697 202 13ms 9 Feb 2026 329th dylanarmstrong 693 165 10ms 22 Jan 2024 330th HumanoidCPU 693 182 459ms 13 Sep 2024 331st AlephSquirrel 693 268 13ms 21 Oct 2024 332nd Shanethegamer 🇺🇸 689 218 5ms 2 Nov 2023 333rd MeWhenI 🇻🇦 689 232 16ms 12 Apr 2024 334th MeWhenI 🇻🇦 685 167 10ms 1 Nov 2023 335th MeWhenI 🇻🇦 685 293 43ms 13 Feb 2025 336th snoozingnewt 🇨🇦 684 303 304ms 18 Oct 2025 337th Pyroan 683 206 12ms 12 Mar 2025 338th Shanethegamer 🇺🇸 680 217 6ms 12 Nov 2023 339th Natanaelel 🇸🇪 678 242 162ms 19 May 2024 340th kkoenig 677 306 274ms 7 Sep 2025 341st stefangimmillaro 673 214 418ms 5 Nov 2023 342nd nwellnhof 🇩🇪 672 160 206ms 1 Nov 2023 343rd snoozingnewt 🇨🇦 668 239 99ms 18 Oct 2025 344th hiichbindermax 667 211 11ms 20 Nov 2023 344th thienudomsrirungruang 667 211 11ms 1 Apr 2024 346th two-bad 🇬🇧 665 172 11ms 25 Feb 2024 347th scpchicken 🇵🇼 661 130 58ms 1 Nov 2023 348th alexsave 661 173 11ms 13 Nov 2025 349th YAJUE114514 661 213 10ms 10 Dec 2025 350th Natanaelel 🇸🇪 660 129 35ms 1 Nov 2023 351st MeWhenI 🇻🇦 659 234 5ms 4 Dec 2023 352nd snoozingnewt 🇨🇦 658 319 225ms 23 Nov 2025 353rd VictorFordham 655 215 13ms 24 Nov 2023 354th MeWhenI 🇻🇦 652 184 58ms 15 Jul 2025 355th elgan65536 🇺🇸 652 322 215ms 11 Apr 2024 356th keelimeguy 🇺🇸 649 217 56ms 16 Nov 2023 357th CaedenHarper 🇨🇦 646 218 18ms 21 Sep 2025 358th edsrzf 🇳🇿 646 325 264ms 23 Jun 2025 359th tatzyr 🇯🇵 644 144 40ms 21 Feb 2025 360th LukeBridges 🇬🇧 642 178 13ms 14 Aug 2024 361st KatieLG 🇬🇧 640 197 559ms 19 Apr 2025 362nd amollberg 🇸🇪 640 220 12ms 14 Jan 2024 363rd janbehrens 🇩🇪 639 190 427ms 9 Jan 2024 364th MeWhenI 🇻🇦 629 189 173ms 3 Aug 2024 365th stefangimmillaro 629 216 2,727ms 12 Nov 2024 366th weliveinhell 🇭🇹 628 182 10ms 1 Nov 2023 367th MeWhenI 🇻🇦 628 393 61ms 24 Jun 2024 368th lukegustafson 🇺🇸 621 184 11ms 8 Mar 2024 369th MeWhenI 🇻🇦 621 242 2ms 3 Sep 2024 370th GolfingSuccess 🇬🇷 618 200 24ms 20 Aug 2024 371st snoozingnewt 🇨🇦 618 220 2,840ms 18 Oct 2025 372nd snoozingnewt 🇨🇦 618 243 5ms 18 Oct 2025 373rd janbehrens 🇩🇪 618 307 521ms 22 Dec 2023 374th annaproxy 617 266 161ms 6 Nov 2023 375th jtaxen 612 230 12ms 8 Jun 2024 375th luuumine 🇫🇷 612 230 11ms 29 Oct 2025 377th Shanethegamer 🇺🇸 611 304 47ms 30 Aug 2024 378th Shanethegamer 🇺🇸 608 227 4ms 1 Nov 2023 379th jared-hughes 608 247 2ms 18 Aug 2024 380th alemelis 607 200 1,470ms 20 Sep 2024 381st alemelis 602 234 32ms 11 Oct 2024 382nd Mandrzejy 🇵🇱 600 283 78ms 8 Jul 2024 383rd MeWhenI 🇻🇦 598 180 138ms 26 Sep 2024 384th croc54 597 236 11ms 17 Dec 2024 385th Mandrzejy 🇵🇱 596 252 2ms 8 Jul 2024 386th MeWhenI 🇻🇦 596 285 1,408ms 1 Nov 2023 387th yuchuehw 594 237 11ms 15 May 2024 388th snoozingnewt 🇨🇦 591 157 36ms 18 Oct 2025 389th MeWhenI 🇻🇦 590 299 149ms 20 Jun 2024 390th fgrosshans 🇫🇷 589 239 13ms 7 Nov 2023 391st CaedenHarper 🇨🇦 587 215 521ms 21 Sep 2025 392nd jameswmccarty 587 240 12ms 24 Feb 2025 392nd Heathcorp 🇦🇺 587 240 11ms 12 Aug 2025 394th Shanethegamer 🇺🇸 586 181 288ms 1 Nov 2023 395th snoozingnewt 🇨🇦 585 185 1,209ms 18 Oct 2025 396th adoxography 584 241 12ms 19 Nov 2023 397th BambooleanLogic 🇸🇪 580 197 11ms 1 Nov 2023 398th snoozingnewt 🇨🇦 578 194 1,242ms 18 Oct 2025 399th Ripick 575 211 386ms 28 Jun 2025 400th wh3n3v3r 🇨🇿 575 245 12ms 11 Nov 2024 First Prev 321–400 of 523 Next Last