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?
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 martinnorling 🇸🇪 315 296 10ms 22 Feb 2022 642nd arcpolaris 315 338 453ms 11 Nov 2025 643rd ozkxr 315 346 10ms 27 Apr 2020 644th relet 314 297 17ms 9 Aug 2018 645th tomh1012 314 339 477ms 21 Sep 2022 646th mizuzimu 313 298 11ms 12 Apr 2020 647th alangodfrey 312 299 16ms 31 Jan 2019 647th ianpoe 312 299 11ms 20 Apr 2020 649th krencl 312 362 5ms 28 Apr 2020 650th mbittner20 310 301 10ms 21 Jan 2024 651st zdzc 308 303 20ms 30 Mar 2018 652nd kypi 307 304 10ms 20 Feb 2020 652nd lhulinsky 307 304 10ms 22 Oct 2024 654th acollett89 307 355 11ms 5 Aug 2025 655th GalladeGuy 🇺🇸 307 481 2ms 3 Sep 2018 656th dijs 306 356 11ms 20 Dec 2019 656th madeforlosers 306 356 10ms 30 Nov 2023 658th chunky 306 864 2ms 29 Sep 2020 659th SpareManiKatti 304 359 10ms 14 Oct 2021 660th Yewzir 🇧🇪 304 408 7ms 24 Dec 2023 661st madex 🇩🇪 304 561 302ms 23 Jun 2024 662nd try-except-try-accept 🇹🇭 303 308 10ms 28 Jun 2022 663rd osmith93 302 309 17ms 1 Aug 2021 663rd Pyroan 302 309 11ms 22 Feb 2025 665th galloj 🇨🇿 302 373 3ms 31 Aug 2022 666th Irratix 🇳🇱 301 595 116ms 21 Nov 2021 667th logvp 300 311 18ms 31 Jan 2024 667th cykim8811 300 311 16ms 10 Jul 2024 669th lukehewittvandy 300 462 649ms 15 Jun 2020 670th gXLg 🇩🇪 299 312 11ms 19 Sep 2023 670th andre-lameirinhas 🇵🇹 299 312 10ms 30 Nov 2023 672nd inverseLorentz 🇦🇺 297 314 11ms 21 Jun 2022 673rd n1LS 296 272 38ms 26 Sep 2019 674th decorator-factory 296 315 10ms 21 May 2019 674th knutae 🇳🇴 296 315 17ms 20 Jul 2019 674th TobyBoyne 🇬🇧 296 315 11ms 14 Apr 2022 677th bbakersmith 295 316 10ms 19 Jul 2021 678th ChrisTheisen 294 362 435ms 19 Dec 2022 679th TheZwierzLF 🇵🇱 293 275 42ms 5 Jan 2026 680th KevinMarquette 🇺🇸 293 315 283ms 23 Apr 2022 681st unfinishedprogram 293 372 11ms 28 Nov 2023 682nd Haksell 🇦🇶 292 319 19ms 1 Dec 2019 682nd Florian-Mt 292 319 10ms 13 Nov 2023 684th jackkav 292 373 11ms 14 Apr 2018 685th dsntzn 🇸🇰 291 375 11ms 2 Mar 2021 686th Emutis 🇱🇹 290 321 11ms 12 Aug 2025 687th PaulMWeiser 290 322 11ms 3 Mar 2023 688th garrisonhh 289 323 17ms 19 Nov 2020 689th Laksen 🇩🇰 289 647 25ms 8 Jul 2021 690th TimCurwick 🇺🇸 288 320 264ms 29 Jul 2020 691st LorenzoTa 287 239 3ms 26 Apr 2019 691st JRaspass 🇬🇧 287 239 3ms 22 May 2022 693rd qwjhvbxi 287 325 10ms 12 Feb 2024 694th madex 🇩🇪 287 355 1,586ms 23 Jun 2024 695th ian-odonnell 287 380 10ms 14 Mar 2018 696th jgbaldwinbrown 286 422 2ms 9 Jul 2021 697th masflam 284 307 548ms 6 May 2021 698th SteveL-MSFT 284 325 270ms 10 Jun 2020 699th dahrens 284 328 11ms 13 May 2021 700th mrmena 🇦🇺 283 329 19ms 11 Jun 2021 700th tomh1012 283 329 9ms 26 Feb 2026 702nd Edjyzod 283 330 11ms 31 Mar 2023 702nd MarshalX 🇵🇱 283 330 9ms 14 Nov 2024 704th msbranicky 283 364 3,714ms 11 Jan 2025 705th lomarbrick 282 331 10ms 17 May 2023 705th Mathrew2012 282 331 10ms 9 Nov 2024 707th arcage 🇯🇵 281 362 1,410ms 10 Aug 2021 708th TaserTheFox 🇺🇸 280 333 13ms 5 Apr 2023 709th MeWhenI 🇻🇦 280 509 1,024ms 28 Mar 2022 710th vaughad 280 616 103ms 21 Jan 2020 711th KatieLG 🇬🇧 279 382 377ms 21 Nov 2021 712th cam-lambda 279 542 5ms 1 May 2018 713th MaxElf999 278 336 11ms 28 Sep 2022 714th mcreenan 276 264 140ms 16 Jun 2018 715th biinari 276 292 35ms 25 Mar 2018 716th za3k 276 338 11ms 8 Oct 2022 716th CheeseCake628 🇳🇴 276 338 10ms 19 Jun 2025 718th adoxography 275 293 34ms 10 Mar 2020 718th yzhs 🇩🇪 275 293 36ms 20 Jul 2022 720th Psirving 275 339 10ms 2 Aug 2020 First Prev 641–720 of 1,003 Next Last
