The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 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 401st dokutan 542 249 7ms 20 Feb 2025 402nd marcin7Cd 541 239 15ms 14 Mar 2020 403rd olivermrose 🇺🇸 540 188 38ms 28 Oct 2021 404th jacklynnepenick 537 241 11ms 28 Aug 2021 404th ImpressedByRocks 537 241 14ms 20 Sep 2022 404th jameswmccarty 537 241 10ms 7 Mar 2025 407th emgordon154 536 471 2ms 9 Jun 2025 408th benwilliamgraham 535 242 11ms 10 Nov 2021 408th Troon 535 242 16ms 21 Oct 2022 408th jakobkordez 🇸🇮 535 242 11ms 31 Oct 2022 411th Natanaelel 🇸🇪 534 343 131ms 22 Jan 2023 412th dokutan 533 173 315ms 8 Sep 2025 413th ArmaanAS 532 243 11ms 25 Mar 2021 413th CLOStrophobic 🇮🇹 532 243 10ms 26 Jan 2025 415th emgordon154 528 211 3,406ms 3 Nov 2024 416th filharmonista 526 251 2ms 9 Mar 2020 417th yuchuehw 524 247 11ms 4 Jan 2024 418th madex 🇩🇪 523 213 3,150ms 23 hours ago 419th IISResetMe 522 219 309ms 2 Dec 2025 420th annaproxy 520 249 9ms 15 Jan 2023 420th adamnielson42 🇺🇸 520 249 10ms 16 Nov 2023 422nd scpchicken 🇵🇼 517 197 149ms 7 Apr 2022 423rd lacroixjonathan87 516 210 4ms 3 Jan 2021 424th Indivicivet 515 251 10ms 18 Oct 2021 425th snoozingnewt 🇨🇦 515 296 101ms 22 Nov 2025 426th dokutan 514 334 3ms 3 Dec 2025 427th jaredcrystal 🇺🇸 511 199 35ms 14 Dec 2020 428th Mabeloid 🇳🇴 509 254 10ms 12 Sep 2024 428th CopperyMarrow15 509 254 15ms 24 Aug 2025 430th jwhear 🇺🇸 509 500 1,752ms 30 Sep 2024 431st gastropner 508 260 2ms 24 Dec 2020 432nd Ted-Barrett 🇦🇺 507 255 10ms 1 Oct 2021 432nd InigoK 🇺🇸 507 255 10ms 6 Sep 2025 434th tobeannouncd 507 361 123ms 8 Jan 2024 435th cellobix 505 256 17ms 15 Aug 2019 435th scpchicken 🇵🇼 505 256 16ms 7 Apr 2022 437th marcin7Cd 504 519 6ms 16 Nov 2020 438th janbehrens 🇩🇪 502 216 5ms 2 Jul 2023 439th janbehrens 🇩🇪 500 261 588ms 24 Mar 2022 440th JDiLenarda 🇫🇷 498 317 1,399ms 29 Nov 2023 441st janbehrens 🇩🇪 496 186 580ms 11 Jul 2023 442nd MeWhenI 🇻🇦 496 240 144ms 27 Jan 2023 443rd daedals 496 261 17ms 21 Jun 2019 444th emgordon154 492 305 4ms 26 Jan 2025 445th bwat2 491 283 625ms 8 Mar 2022 446th Lv0Sys 🇵🇱 488 189 659ms 30 Nov 2025 447th didion0 🇺🇸 488 249 11ms 1 Dec 2021 447th weliveinhell 🇭🇹 488 249 11ms 1 Feb 2024 449th hiichbindermax 488 265 10ms 22 Nov 2025 450th Phanabani 🇺🇸 486 266 10ms 22 Oct 2020 450th krcs 🇵🇱 486 266 10ms 30 Jun 2023 452nd iznax 486 306 506ms 21 Nov 2021 453rd choroba 484 233 7ms 3 May 2018 454th Mabeloid 🇳🇴 483 254 610ms 17 Sep 2024 455th Evan-Robotics 483 268 10ms 28 Jan 2022 456th viv511 479 318 1,525ms 16 Feb 2025 457th vezzick 476 272 10ms 6 Mar 2021 457th knutae 🇳🇴 476 272 11ms 21 Aug 2021 457th glesnick 476 272 10ms 15 Jul 2022 460th Ripick 475 363 374ms 11 Aug 2024 461st NerdyMcNerd42 474 273 10ms 18 Feb 2023 462nd bkshrader 472 274 16ms 27 Dec 2018 463rd KatieLG 🇬🇧 470 216 445ms 10 Apr 2022 464th geofft 470 275 10ms 13 Dec 2020 465th ArmaanAS 469 259 11ms 25 Mar 2021 466th myfatemi04 469 276 10ms 20 Sep 2018 467th janbehrens 🇩🇪 468 297 617ms 7 Jan 2021 468th kevinmchung 467 277 11ms 24 Feb 2018 468th yokasuretsu 467 277 10ms 26 Apr 2018 468th mbittner20 467 277 10ms 21 Jan 2024 471st yzhs 🇩🇪 467 392 143ms 2 Aug 2021 472nd naveenarun 464 279 10ms 6 Jun 2019 472nd Starwort 🇬🇧 464 279 12ms 10 Feb 2020 474th elgan65536 🇺🇸 463 396 199ms 6 Mar 2024 475th NanduBC 462 280 11ms 22 Mar 2021 475th DrakeSeteraO 462 280 10ms 10 Nov 2025 477th prestosilver 🇺🇸 459 375 366ms 5 days ago 478th bstrautin 456 251 283ms 5 Jun 2020 479th wh3n3v3r 🇨🇿 454 268 10ms 11 Nov 2024 480th skps2010 454 285 16ms 28 Dec 2018 First Prev 401–480 of 902 Next Last