The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Morse Decoder 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 guliyevemil1 🇦🇿 368 523 335ms 16 Apr 2020 562nd TimCurwick 🇺🇸 365 313 278ms 28 Jul 2020 563rd Natanaelel 🇸🇪 364 301 6ms 23 Jun 2023 564th JOrE20 364 334 13ms 27 Jan 2026 565th kmathis22 364 382 415ms 6 Feb 2026 566th Yewzir 🇧🇪 364 699 1,982ms 15 Nov 2025 567th TaserTheFox 🇺🇸 363 356 12ms 4 Apr 2023 567th vgamula 🇺🇦 363 356 10ms 8 Jul 2025 569th CaedenHarper 🇨🇦 362 336 10ms 6 Nov 2025 570th dzshn 362 357 10ms 25 Nov 2020 570th Pena86 362 357 10ms 31 Dec 2021 572nd s-g-stavely 362 416 1ms 11 May 2021 573rd MaxCastella 🇫🇷 360 318 294ms 15 Mar 2024 574th inverseLorentz 🇦🇺 360 359 10ms 11 Mar 2024 575th Psirving 359 360 10ms 2 Aug 2020 575th fajost 359 360 15ms 8 Sep 2020 577th leon-w 357 362 10ms 12 Jul 2019 577th TheAristos 357 362 14ms 30 Oct 2019 579th dokutan 356 285 32ms 21 Apr 2025 580th tomh1012 355 342 10ms 20 Oct 2020 581st KatieLG 🇬🇧 355 345 615ms 27 Jul 2025 582nd msbranicky 354 543 345ms 31 Aug 2023 583rd qwjhvbxi 352 368 10ms 12 Feb 2024 583rd tomh1012 352 368 10ms 27 days ago 585th McErer 351 346 11ms 14 Jan 2019 586th TheZwierzLF 🇵🇱 351 369 10ms 8 Dec 2025 587th KatieLG 🇬🇧 351 424 379ms 24 Oct 2022 588th Babafaba 350 370 12ms 23 Nov 2025 589th omurakazuaki 🇯🇵 347 350 12ms 17 Feb 2021 590th williamlake 347 527 131ms 17 Sep 2021 591st wuminws 346 322 3,310ms 20 Feb 2025 592nd LordSir101 345 352 10ms 16 Aug 2025 593rd Laksen 🇩🇰 343 562 27ms 8 Jul 2021 594th KatieLG 🇬🇧 342 355 10ms 4 Feb 2022 594th mrxz 🇳🇱 342 355 10ms 23 Jun 2024 596th Babafaba 342 359 747ms 24 Nov 2025 597th RaBa21 🇭🇺 342 378 16ms 18 Jul 2025 598th febiw 341 379 10ms 22 Mar 2020 599th lukasmoellerch 340 357 11ms 15 Jul 2019 600th meenie 339 300 38ms 21 Jan 2023 601st aaronze 🇦🇺 339 359 11ms 1 Apr 2021 602nd wrhm 339 382 13ms 15 Dec 2020 603rd postie77 339 439 419ms 2 May 2023 604th madeforlosers 338 360 16ms 23 Oct 2024 605th 71c 338 383 10ms 29 Apr 2018 606th SB-945 337 384 10ms 10 Mar 2024 607th msbranicky 336 492 2ms 14 Oct 2023 608th SteveL-MSFT 335 341 293ms 10 Jun 2020 609th KatieLG 🇬🇧 334 334 1,615ms 25 Apr 2021 610th arcage 🇯🇵 332 336 1,431ms 10 Aug 2021 611th bbakersmith 332 369 16ms 31 Jul 2021 612th dokutan 331 483 1,033ms 3 Feb 2026 613th msbranicky 330 392 10ms 3 Jul 2023 614th marcin7Cd 330 420 44ms 11 Mar 2021 615th biinari 329 309 38ms 25 Mar 2018 616th pg98 329 369 14ms 5 Sep 2019 617th msbranicky 327 573 3ms 13 Aug 2023 618th n1LS 324 314 42ms 2 Oct 2019 619th galloj 🇨🇿 324 338 2ms 17 Jan 2023 620th neihousaigaai 324 428 657ms 18 Apr 2021 621st TheZwierzLF 🇵🇱 322 316 37ms 25 Dec 2025 622nd dijs 322 378 11ms 20 Dec 2019 622nd SpareManiKatti 322 378 11ms 14 Oct 2021 624th Anonymousellama21 320 342 2ms 16 May 2022 625th GWStuart 318 407 10ms 27 Jan 2023 626th MeWhenI 🇻🇦 318 416 2ms 25 Aug 2023 627th dsntzn 🇸🇰 316 385 10ms 3 Mar 2021 628th alemelis 315 293 838ms 6 Aug 2024 629th codewrite 🇬🇧 315 411 10ms 12 Jul 2025 630th dokutan 314 396 94ms 26 Jan 2026 631st michelebastione 🇮🇹 314 412 11ms 21 Mar 2022 632nd msbranicky 313 392 714ms 17 Jan 2024 633rd alexhuntley 312 444 5ms 11 Apr 2021 634th brochmann 🇸🇪 311 416 10ms 9 Feb 2022 634th ellis-rix 311 416 11ms 12 Jun 2023 636th stordev 310 418 10ms 26 Feb 2021 637th Florian-Mt 309 419 10ms 28 Nov 2023 638th LucaArgentiUCF 🇮🇹 308 590 42ms 23 Jan 2021 639th Waffle3z 307 331 34ms 22 Jan 2021 640th acollett89 307 396 11ms 5 Aug 2025 First Prev 561–640 of 902 Next Last
