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 481st blaztoma 🇱🇹 533 203 3ms 23 Oct 2025 482nd Babafaba 533 257 17ms 11 Nov 2025 483rd violeta-desantis 528 243 2ms 17 Apr 2024 484th arctouch-cristiannevianna 527 252 470ms 29 Feb 2024 485th two-bad 🇬🇧 527 259 11ms 28 Feb 2024 486th c0d3-4-F00d 🇩🇪 526 244 2ms 5 Jun 2023 487th emgordon154 524 288 4ms 28 Dec 2024 488th Mabeloid 🇳🇴 522 236 560ms 21 Sep 2024 489th skps2010 521 262 9ms 29 Dec 2018 489th helbling 🇨🇭 521 262 13ms 15 Jun 2024 491st thisishowmymindworks 🇳🇴 521 263 9ms 12 Oct 2020 492nd MeWhenI 🇻🇦 521 602 11ms 10 Feb 2025 493rd yzhs 🇩🇪 519 264 11ms 23 Jun 2023 494th raphaelimahorn 517 264 11ms 18 Aug 2021 495th ImpressedByRocks 517 265 15ms 19 Sep 2022 496th didion0 🇺🇸 515 265 11ms 2 Feb 2021 497th labster 514 224 159ms 10 Mar 2018 498th tatzyr 🇯🇵 513 217 39ms 14 Mar 2025 499th InigoK 🇺🇸 507 270 10ms 15 Jun 2023 499th msbranicky 507 270 18ms 5 Jul 2023 499th fgrosshans 🇫🇷 507 270 11ms 9 Jul 2024 502nd mtirado1 507 300 2ms 7 May 2023 503rd MichalMarsalek 🇨🇿 507 317 439ms 4 Sep 2022 504th EnviloN 🇨🇿 505 271 10ms 20 Oct 2024 505th Babafaba 504 244 595ms 11 Nov 2025 506th hamhub7 500 266 429ms 18 Aug 2022 507th janAkali 🇷🇺 498 323 388ms 10 Sep 2024 508th guliyevemil1 🇦🇿 498 340 327ms 18 Apr 2020 509th bricknellj 498 701 2ms 3 May 2024 510th snoozingnewt 🇨🇦 497 323 2ms 9 Nov 2025 511th postie77 494 269 410ms 10 May 2023 512th villfa 493 270 4ms 21 May 2019 513th moikaturns 🇬🇧 491 278 10ms 10 Nov 2022 514th nullie 489 280 11ms 9 Jun 2022 515th revlayle 🇺🇸 487 273 479ms 23 Jun 2023 516th yokasuretsu 487 281 10ms 19 Apr 2018 517th petar-donchev 486 282 11ms 7 Sep 2019 517th geofft 486 282 11ms 14 Dec 2020 519th Mabeloid 🇳🇴 485 314 2ms 21 Sep 2024 520th dokutan 483 315 2ms 17 Apr 2024 521st jakobkordez 🇸🇮 482 284 10ms 31 Oct 2022 522nd gotbadger 478 233 38ms 21 Nov 2024 523rd zakariamouhid 477 286 14ms 27 Feb 2023 524th neihousaigaai 477 287 12ms 27 Dec 2021 524th eshilo-draper 477 287 10ms 21 Sep 2022 524th Ythaenagor 477 287 10ms 5 Aug 2024 527th proton 🇩🇪 476 234 38ms 20 Jun 2020 528th iznax 473 281 434ms 21 Nov 2021 529th trinityy-7 470 290 11ms 19 Jul 2023 529th wh3n3v3r 🇨🇿 470 290 12ms 11 Nov 2024 531st neihousaigaai 469 291 9ms 15 Mar 2021 532nd Yewzir 🇧🇪 469 329 8ms 26 Dec 2024 533rd MeWhenI 🇻🇦 468 282 179ms 3 Aug 2024 534th Bonjour27891 🇻🇳 468 293 14ms 10 Apr 2022 535th kmathis22 467 338 497ms 6 Feb 2026 536th randolchance 466 294 10ms 20 Jun 2025 537th janbehrens 🇩🇪 466 308 449ms 20 Nov 2022 538th edre 464 295 10ms 30 Apr 2018 539th prestosilver 🇺🇸 462 348 371ms 2 days ago 540th ForkKILLET 🇨🇳 461 296 10ms 21 Feb 2021 541st guilhem-roy 🇫🇷 460 298 10ms 3 Mar 2022 542nd relet 458 299 17ms 9 Aug 2018 542nd leon-w 458 299 21ms 5 Jan 2019 544th evanrittner 457 300 10ms 26 Feb 2021 545th graft 456 244 35ms 11 Mar 2018 546th erin-allison 456 250 308ms 31 Mar 2021 547th msbranicky 453 272 616ms 17 Jan 2024 548th amazingalek 🇳🇴 453 293 443ms 29 Dec 2025 549th stefangimmillaro 451 270 2ms 28 Oct 2025 550th martinnorling 🇸🇪 451 304 10ms 22 Feb 2022 551st janbehrens 🇩🇪 450 285 2ms 21 Mar 2022 552nd JRaspass 🇬🇧 449 241 3ms 19 Feb 2018 553rd CaedenHarper 🇨🇦 449 304 11ms 6 Nov 2025 554th mbittner20 449 305 10ms 21 Jan 2024 555th kypi 448 306 10ms 20 Feb 2020 556th Kees-van-Beilen 447 305 10ms 14 May 2023 556th LukeBridges 🇬🇧 447 305 10ms 20 Aug 2024 558th alemelis 446 269 959ms 4 Mar 2024 559th tomh1012 446 306 10ms 14 Sep 2020 559th GeorgeStechman 🇬🇧 446 306 10ms 20 Nov 2022 First Prev 481–560 of 1,009 Next Last