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?
Morse Encoder 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 641st arcpolaris 315 338 453ms 11 Nov 2025 642nd ozkxr 315 346 10ms 27 Apr 2020 643rd relet 314 297 17ms 9 Aug 2018 644th tomh1012 314 339 477ms 21 Sep 2022 645th mizuzimu 313 298 11ms 12 Apr 2020 646th alangodfrey 312 299 16ms 31 Jan 2019 646th ianpoe 312 299 11ms 20 Apr 2020 648th krencl 312 362 5ms 28 Apr 2020 649th mbittner20 310 301 10ms 21 Jan 2024 650th zdzc 308 303 20ms 30 Mar 2018 651st kypi 307 304 10ms 20 Feb 2020 651st lhulinsky 307 304 10ms 22 Oct 2024 653rd acollett89 307 355 11ms 5 Aug 2025 654th GalladeGuy 🇺🇸 307 481 2ms 3 Sep 2018 655th dijs 306 356 11ms 20 Dec 2019 655th madeforlosers 306 356 10ms 30 Nov 2023 657th chunky 306 864 2ms 29 Sep 2020 658th SpareManiKatti 304 359 10ms 14 Oct 2021 659th Yewzir 🇧🇪 304 408 7ms 24 Dec 2023 660th madex 🇩🇪 304 561 323ms 23 Jun 2024 661st try-except-try-accept 🇹🇭 303 308 10ms 28 Jun 2022 662nd osmith93 302 309 17ms 1 Aug 2021 662nd Pyroan 302 309 11ms 22 Feb 2025 664th galloj 🇨🇿 302 373 3ms 31 Aug 2022 665th Irratix 🇳🇱 301 595 116ms 21 Nov 2021 666th logvp 300 311 18ms 31 Jan 2024 666th cykim8811 300 311 16ms 10 Jul 2024 668th lukehewittvandy 300 462 649ms 15 Jun 2020 669th gXLg 🇩🇪 299 312 11ms 19 Sep 2023 669th andre-lameirinhas 🇵🇹 299 312 10ms 30 Nov 2023 671st inverseLorentz 🇦🇺 297 314 11ms 21 Jun 2022 672nd n1LS 296 272 38ms 26 Sep 2019 673rd decorator-factory 296 315 10ms 21 May 2019 673rd knutae 🇳🇴 296 315 17ms 20 Jul 2019 673rd TobyBoyne 🇬🇧 296 315 11ms 14 Apr 2022 676th bbakersmith 295 316 10ms 19 Jul 2021 677th ChrisTheisen 294 362 435ms 19 Dec 2022 678th TheZwierzLF 🇵🇱 293 275 42ms 5 Jan 2026 679th KevinMarquette 🇺🇸 293 315 283ms 23 Apr 2022 680th unfinishedprogram 293 372 11ms 28 Nov 2023 681st Haksell 🇦🇶 292 319 19ms 1 Dec 2019 681st Florian-Mt 292 319 10ms 13 Nov 2023 683rd jackkav 292 373 11ms 14 Apr 2018 684th dsntzn 🇸🇰 291 375 11ms 2 Mar 2021 685th Emutis 🇱🇹 290 321 11ms 12 Aug 2025 686th PaulMWeiser 290 322 11ms 3 Mar 2023 687th garrisonhh 289 323 17ms 19 Nov 2020 688th Laksen 🇩🇰 289 647 25ms 8 Jul 2021 689th TimCurwick 🇺🇸 288 320 264ms 29 Jul 2020 690th LorenzoTa 287 239 3ms 26 Apr 2019 690th JRaspass 🇬🇧 287 239 3ms 22 May 2022 692nd qwjhvbxi 287 325 10ms 12 Feb 2024 693rd madex 🇩🇪 287 355 1,586ms 23 Jun 2024 694th ian-odonnell 287 380 10ms 14 Mar 2018 695th jgbaldwinbrown 286 422 2ms 9 Jul 2021 696th masflam 284 307 548ms 6 May 2021 697th SteveL-MSFT 284 325 270ms 10 Jun 2020 698th dahrens 284 328 11ms 13 May 2021 699th mrmena 🇦🇺 283 329 19ms 11 Jun 2021 699th tomh1012 283 329 9ms 27 days ago 701st Edjyzod 283 330 11ms 31 Mar 2023 701st MarshalX 🇵🇱 283 330 9ms 14 Nov 2024 703rd msbranicky 283 364 3,714ms 11 Jan 2025 704th lomarbrick 282 331 10ms 17 May 2023 704th Mathrew2012 282 331 10ms 9 Nov 2024 706th arcage 🇯🇵 281 362 1,410ms 10 Aug 2021 707th TaserTheFox 🇺🇸 280 333 13ms 5 Apr 2023 708th MeWhenI 🇻🇦 280 509 1,024ms 28 Mar 2022 709th vaughad 280 616 99ms 21 Jan 2020 710th KatieLG 🇬🇧 279 382 377ms 21 Nov 2021 711th cam-lambda 279 542 5ms 1 May 2018 712th MaxElf999 278 336 11ms 28 Sep 2022 713th mcreenan 276 264 140ms 16 Jun 2018 714th biinari 276 292 35ms 25 Mar 2018 715th za3k 276 338 11ms 8 Oct 2022 715th CheeseCake628 🇳🇴 276 338 10ms 19 Jun 2025 717th adoxography 275 293 34ms 10 Mar 2020 717th yzhs 🇩🇪 275 293 36ms 20 Jul 2022 719th Psirving 275 339 10ms 2 Aug 2020 719th TheZwierzLF 🇵🇱 275 339 10ms 8 Dec 2025 First Prev 641–720 of 1,003 Next Last
