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 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 561st alangodfrey 446 307 16ms 31 Jan 2019 561st ianpoe 446 307 11ms 20 Apr 2020 563rd varhammer 446 369 9ms 23 Nov 2021 564th ian-h-chamberlain 🇺🇸 446 406 42ms 21 Oct 2025 565th AlexDaniel 🇪🇪 445 259 136ms 13 Mar 2018 566th robin-scragg 443 309 10ms 18 Oct 2025 567th lhulinsky 442 310 10ms 22 Oct 2024 568th bbakersmith 442 342 26ms 31 Jul 2021 569th mwarvik 🇳🇴 441 301 546ms 26 Dec 2025 570th junkondo-jp 441 309 10ms 11 Jun 2024 571st strattonwhisler 440 310 11ms 22 Apr 2022 572nd zdzc 440 311 20ms 30 Mar 2018 573rd Giantnoodlemonster 439 292 2ms 29 Sep 2024 574th Schmitt-Very-Cool 439 359 425ms 2 Oct 2025 575th LorenzoTa 438 247 3ms 26 Apr 2019 576th logvp 438 313 18ms 31 Jan 2024 577th jwhear 🇺🇸 438 414 1,843ms 30 Sep 2024 578th dokutan 436 313 10ms 28 Mar 2025 579th mizuzimu 436 314 11ms 12 Apr 2020 579th gXLg 🇩🇪 436 314 11ms 19 Sep 2023 579th andre-lameirinhas 🇵🇹 436 314 10ms 30 Nov 2023 582nd yokasuretsu 435 256 39ms 19 Apr 2018 583rd try-except-try-accept 🇹🇭 434 316 10ms 28 Jun 2022 584th decorator-factory 432 317 10ms 21 May 2019 584th osmith93 432 317 17ms 1 Aug 2021 584th cykim8811 432 317 16ms 10 Jul 2024 584th Pyroan 432 317 11ms 22 Feb 2025 588th GrayJoKing 🇦🇺 431 811 2ms 23 Jul 2020 589th lukasmoellerch 429 318 10ms 15 Jul 2019 589th omurakazuaki 🇯🇵 429 318 10ms 13 Feb 2021 591st snoozingnewt 🇨🇦 429 368 554ms 14 Sep 2025 592nd msbranicky 428 375 2ms 12 Aug 2023 593rd mcreenan 427 270 140ms 16 Jun 2018 594th Haksell 🇦🇶 427 321 19ms 1 Dec 2019 594th Florian-Mt 427 321 10ms 13 Nov 2023 596th yzhs 🇩🇪 426 270 32ms 6 Sep 2020 597th johnkiernander 425 321 16ms 12 Dec 2025 598th ejmejm 425 322 10ms 2 Dec 2021 598th inverseLorentz 🇦🇺 425 322 11ms 21 Jun 2022 600th yuchuehw 425 371 673ms 4 Jan 2024 601st garrisonhh 424 323 17ms 19 Nov 2020 602nd ericlangedijk 🇸🇮 423 314 433ms 18 Mar 2022 603rd smclaughlin-cf 421 324 11ms 15 Apr 2025 604th yzhs 🇩🇪 420 446 120ms 25 Jul 2021 605th 1231234md5 🇨🇳 418 326 12ms 29 Jan 2024 606th TobyBoyne 🇬🇧 418 328 13ms 15 Apr 2022 607th mintypython 417 327 10ms 19 Oct 2018 608th Florian-Mt 416 328 11ms 13 Nov 2023 609th Emutis 🇱🇹 416 329 11ms 12 Aug 2025 610th dahrens 415 330 11ms 13 May 2021 610th PaulMWeiser 415 330 11ms 3 Mar 2023 612th knutae 🇳🇴 414 331 17ms 20 Jul 2019 612th mrmena 🇦🇺 414 331 19ms 11 Jun 2021 614th madex 🇩🇪 413 311 2ms 11 Jun 2025 615th Edjyzod 413 332 11ms 31 Mar 2023 616th gnlow 🇰🇷 411 332 12ms 25 Apr 2020 617th qwjhvbxi 411 333 10ms 12 Feb 2024 617th tomh1012 411 333 9ms 26 Feb 2026 619th dokutan 410 416 92ms 26 Jan 2026 620th TaserTheFox 🇺🇸 409 335 13ms 5 Apr 2023 621st MaxElf999 405 338 11ms 28 Sep 2022 621st MarshalX 🇵🇱 405 338 9ms 14 Nov 2024 623rd eranws 404 338 11ms 24 Oct 2022 623rd JOrE20 404 338 12ms 28 Jan 2026 625th lomarbrick 404 339 10ms 17 May 2023 625th Mathrew2012 404 339 10ms 9 Nov 2024 627th neihousaigaai 404 390 548ms 18 May 2021 628th za3k 403 340 11ms 8 Oct 2022 628th RaBa21 🇭🇺 403 340 17ms 13 Jul 2025 630th TheZwierzLF 🇵🇱 402 277 42ms 5 Jan 2026 631st Psirving 402 341 10ms 2 Aug 2020 631st TheZwierzLF 🇵🇱 402 341 10ms 8 Dec 2025 633rd pg98 400 341 11ms 5 Sep 2019 634th TheAristos 399 343 11ms 30 Oct 2019 635th Yewzir 🇧🇪 399 416 7ms 24 Dec 2023 636th ericlangedijk 🇸🇮 399 490 61ms 23 Feb 2022 637th adriweb 🇫🇷 398 382 2ms 11 Aug 2023 638th perlebach 🇨🇿 397 273 3ms 17 Aug 2021 639th n1LS 397 280 38ms 26 Sep 2019 640th fitzdotlol 🇺🇸 397 344 10ms 28 Mar 2022 First Prev 561–640 of 1,009 Next Last
