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 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 400th ImpressedByRocks 537 241 14ms 20 Sep 2022 400th jameswmccarty 537 241 10ms 7 Mar 2025 403rd emgordon154 536 471 2ms 9 Jun 2025 404th benwilliamgraham 535 242 11ms 10 Nov 2021 404th Troon 535 242 16ms 21 Oct 2022 404th jakobkordez 🇸🇮 535 242 11ms 31 Oct 2022 407th Natanaelel 🇸🇪 534 343 131ms 22 Jan 2023 408th dokutan 533 173 315ms 8 Sep 2025 409th ArmaanAS 532 243 11ms 25 Mar 2021 409th CLOStrophobic 🇮🇹 532 243 10ms 26 Jan 2025 411th emgordon154 528 211 3,406ms 3 Nov 2024 412th filharmonista 526 251 2ms 9 Mar 2020 413th yuchuehw 524 247 11ms 4 Jan 2024 414th IISResetMe 522 219 309ms 2 Dec 2025 415th annaproxy 520 249 9ms 15 Jan 2023 415th adamnielson42 🇺🇸 520 249 10ms 16 Nov 2023 417th scpchicken 🇵🇼 517 197 150ms 7 Apr 2022 418th lacroixjonathan87 516 210 4ms 3 Jan 2021 419th Indivicivet 515 251 10ms 18 Oct 2021 420th snoozingnewt 🇨🇦 515 296 101ms 22 Nov 2025 421st dokutan 514 334 3ms 3 Dec 2025 422nd jaredcrystal 🇺🇸 511 199 35ms 14 Dec 2020 423rd Mabeloid 🇳🇴 509 254 10ms 12 Sep 2024 423rd CopperyMarrow15 509 254 15ms 24 Aug 2025 425th jwhear 🇺🇸 509 500 1,752ms 30 Sep 2024 426th gastropner 508 260 2ms 24 Dec 2020 427th Ted-Barrett 🇦🇺 507 255 10ms 1 Oct 2021 427th InigoK 🇺🇸 507 255 10ms 6 Sep 2025 429th tobeannouncd 507 361 123ms 8 Jan 2024 430th cellobix 505 256 17ms 15 Aug 2019 430th scpchicken 🇵🇼 505 256 16ms 7 Apr 2022 432nd marcin7Cd 504 519 6ms 16 Nov 2020 433rd janbehrens 🇩🇪 502 216 5ms 2 Jul 2023 434th janbehrens 🇩🇪 500 261 588ms 24 Mar 2022 435th JDiLenarda 🇫🇷 498 317 1,399ms 29 Nov 2023 436th janbehrens 🇩🇪 496 186 580ms 11 Jul 2023 437th MeWhenI 🇻🇦 496 240 144ms 27 Jan 2023 438th daedals 496 261 17ms 21 Jun 2019 439th emgordon154 492 305 4ms 26 Jan 2025 440th bwat2 491 283 625ms 8 Mar 2022 441st Lv0Sys 🇵🇱 488 189 659ms 30 Nov 2025 442nd didion0 🇺🇸 488 249 11ms 1 Dec 2021 442nd weliveinhell 🇭🇹 488 249 11ms 1 Feb 2024 444th hiichbindermax 488 265 10ms 22 Nov 2025 445th Phanabani 🇺🇸 486 266 10ms 22 Oct 2020 445th krcs 🇵🇱 486 266 10ms 30 Jun 2023 447th iznax 486 306 506ms 21 Nov 2021 448th choroba 484 233 3ms 3 May 2018 449th Mabeloid 🇳🇴 483 254 610ms 17 Sep 2024 450th Evan-Robotics 483 268 10ms 28 Jan 2022 451st viv511 479 318 1,525ms 16 Feb 2025 452nd vezzick 476 272 10ms 6 Mar 2021 452nd knutae 🇳🇴 476 272 11ms 21 Aug 2021 452nd glesnick 476 272 10ms 15 Jul 2022 455th Ripick 475 363 374ms 11 Aug 2024 456th NerdyMcNerd42 474 273 10ms 18 Feb 2023 457th bkshrader 472 274 16ms 27 Dec 2018 458th KatieLG 🇬🇧 470 216 445ms 10 Apr 2022 459th geofft 470 275 10ms 13 Dec 2020 460th ArmaanAS 469 259 11ms 25 Mar 2021 461st myfatemi04 469 276 10ms 20 Sep 2018 462nd janbehrens 🇩🇪 468 297 617ms 7 Jan 2021 463rd kevinmchung 467 277 11ms 24 Feb 2018 463rd yokasuretsu 467 277 10ms 26 Apr 2018 463rd mbittner20 467 277 10ms 21 Jan 2024 466th yzhs 🇩🇪 467 392 143ms 2 Aug 2021 467th naveenarun 464 279 10ms 6 Jun 2019 467th Starwort 🇬🇧 464 279 12ms 10 Feb 2020 469th NanduBC 462 280 11ms 22 Mar 2021 469th DrakeSeteraO 462 280 10ms 10 Nov 2025 471st elgan65536 🇺🇸 462 396 199ms 6 Mar 2024 472nd prestosilver 🇺🇸 459 375 366ms 2 days ago 473rd bstrautin 456 251 283ms 5 Jun 2020 474th wh3n3v3r 🇨🇿 454 268 10ms 11 Nov 2024 475th skps2010 454 285 16ms 28 Dec 2018 475th amollberg 🇸🇪 454 285 17ms 15 Jan 2022 477th dtbao20 🇻🇳 451 287 11ms 1 Oct 2024 477th Emutis 🇱🇹 451 287 10ms 14 Nov 2025 479th Schmitt-Very-Cool 448 310 641ms 3 Oct 2025 480th arctouch-cristiannevianna 448 332 380ms 1 Mar 2024 First Prev 401–480 of 899 Next Last