The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Morse Decoder in all languages in chars. 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 Chars Time Submitted 561st LucaArgentiUCF 🇮🇹 302 582 42ms 23 Jan 2021 562nd TheZwierzLF 🇵🇱 301 284 848ms 14 Dec 2025 563rd CaedenHarper 🇨🇦 300 324 10ms 6 Nov 2025 564th yokasuretsu 297 220 37ms 26 Apr 2018 565th BenBanerjeeRichards 297 300 10ms 12 Nov 2021 566th neihousaigaai 297 327 10ms 14 May 2021 567th chunky 297 832 2ms 1 Oct 2020 568th s-g-stavely 296 414 1ms 11 May 2021 569th alexhuntley 295 444 5ms 11 Apr 2021 570th fgrosshans 🇫🇷 293 304 10ms 9 May 2023 571st Yewzir 🇧🇪 292 293 424ms 15 Jan 2024 572nd yokasuretsu 291 223 138ms 28 Jun 2018 573rd neihousaigaai 291 428 657ms 18 Apr 2021 574th msbranicky 291 565 3ms 13 Aug 2023 575th MeWhenI 🇻🇦 289 1,316 38ms 28 Aug 2023 576th eiburns 288 309 10ms 25 Aug 2023 577th Yewzir 🇧🇪 288 434 10ms 26 Dec 2024 578th juliansiebert 🇩🇪 286 298 337ms 20 Jan 2023 579th tomh1012 286 340 10ms 20 Oct 2020 580th jmerle 🇳🇱 284 313 10ms 11 Jul 2023 581st dokutan 284 871 2ms 9 Dec 2024 582nd mizuzimu 282 315 11ms 16 Mar 2021 583rd LordSir101 282 344 10ms 16 Aug 2025 584th olligobber 🇦🇺 282 631 141ms 22 May 2020 585th omurakazuaki 🇯🇵 281 345 14ms 17 Feb 2021 586th McErer 281 346 11ms 14 Jan 2019 587th TimCurwick 🇺🇸 280 305 278ms 28 Jul 2020 588th mathisfun271 280 318 10ms 19 Feb 2024 589th patbassing 279 319 10ms 8 Jul 2019 589th dymowski 279 319 10ms 3 Jan 2020 591st KatieLG 🇬🇧 276 332 1,615ms 25 Apr 2021 592nd MaxCastella 🇫🇷 275 310 294ms 15 Mar 2024 593rd KatieLG 🇬🇧 275 353 10ms 4 Feb 2022 594th NicoAdams 273 326 10ms 30 Dec 2021 595th arcage 🇯🇵 273 336 1,431ms 10 Aug 2021 596th lukasmoellerch 273 355 11ms 15 Jul 2019 597th relet 271 328 16ms 9 Aug 2018 597th TobyBoyne 🇬🇧 271 328 13ms 15 Apr 2022 599th madeforlosers 271 358 16ms 23 Oct 2024 600th zdzc 270 329 11ms 1 Apr 2018 601st LeeCamp 270 330 18ms 25 Dec 2021 601st neihousaigaai 270 330 10ms 14 Feb 2024 603rd aaronze 🇦🇺 270 359 11ms 1 Apr 2021 604th choroba 269 225 3ms 3 May 2018 605th kurkale6ka 269 331 16ms 29 Dec 2023 606th pg98 267 363 14ms 5 Sep 2019 607th robymus 266 246 35ms 18 Sep 2018 608th dokutan 264 676 134ms 16 Jan 2026 609th dokutan 263 290 3ms 12 Feb 2025 610th tpaxman 🇨🇦 263 338 11ms 17 Dec 2020 611th JOrE20 263 588 160ms 27 Jan 2026 612th OllieBoyne 🇬🇧 262 340 10ms 14 Apr 2022 612th aksyristos 262 340 10ms 16 days ago 614th dijs 262 370 11ms 20 Dec 2019 614th SpareManiKatti 262 370 11ms 14 Oct 2021 616th 007lock 262 698 311ms 11 May 2020 617th alemelis 260 285 838ms 6 Aug 2024 618th graft 258 253 36ms 10 Mar 2018 619th dokutan 258 725 62ms 3 Jul 2025 620th 77Tigers 257 346 10ms 2 Mar 2021 621st dsntzn 🇸🇰 257 377 10ms 3 Mar 2021 622nd D1CED 257 612 22ms 17 Nov 2021 623rd SteveL-MSFT 256 333 293ms 10 Jun 2020 624th retrohun 256 401 2ms 26 Aug 2025 625th jfallon1997 255 349 10ms 24 Aug 2022 626th inverseLorentz 🇦🇺 253 351 10ms 11 Mar 2024 627th ian-h-chamberlain 🇺🇸 253 705 245ms 12 Oct 2020 628th TaserTheFox 🇺🇸 251 354 12ms 4 Apr 2023 629th dzshn 251 355 10ms 25 Nov 2020 630th vgamula 🇺🇦 250 356 10ms 8 Jul 2025 631st acollett89 250 388 11ms 5 Aug 2025 632nd Pena86 249 357 10ms 31 Dec 2021 633rd mcreenan 247 263 137ms 16 Jun 2018 634th Psirving 247 360 10ms 2 Aug 2020 634th qwjhvbxi 247 360 10ms 12 Feb 2024 636th MeWhenI 🇻🇦 247 583 4ms 16 Apr 2023 637th TheAristos 246 362 14ms 30 Oct 2019 638th mintypython 245 397 10ms 19 Oct 2018 639th TheZwierzLF 🇵🇱 243 366 11ms 8 Dec 2025 640th tomh1012 242 368 10ms 22 days ago First Prev 561–640 of 896 Next Last
