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 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 Natanaelel 🇸🇪 370 304 3ms 23 Jun 2023 562nd jerrandolph 370 436 362ms 3 Nov 2023 563rd Yewzir 🇧🇪 369 467 1,899ms 7 May 2024 564th CallanMcNulty 368 296 11ms 20 Mar 2022 565th LukeBridges 🇬🇧 367 297 10ms 20 Aug 2024 566th dokutan 367 388 7ms 2 Apr 2024 567th Yewzir 🇧🇪 366 255 11ms 19 May 2023 567th Babafaba 366 255 17ms 11 Nov 2025 569th tomh1012 366 298 10ms 14 Sep 2020 569th GeorgeStechman 🇬🇧 366 298 10ms 20 Nov 2022 571st BuBuaBu 366 404 1ms 30 Aug 2023 572nd LSWdigital 365 397 14ms 15 Dec 2021 573rd 0xjac 🇨🇭 365 442 316ms 9 Jun 2025 574th tobeannouncd 365 491 128ms 29 Apr 2024 575th mwarvik 🇳🇴 364 293 546ms 26 Dec 2025 576th pandapawskat 362 333 1ms 2 Sep 2021 577th strattonwhisler 361 302 11ms 22 Apr 2022 578th Kees-van-Beilen 360 303 10ms 14 May 2023 579th Bonjour27891 🇻🇳 359 260 13ms 10 Apr 2022 580th Babafaba 357 242 595ms 11 Nov 2025 581st ImpressedByRocks 357 261 15ms 19 Sep 2022 582nd neihousaigaai 357 388 548ms 18 May 2021 583rd InigoK 🇺🇸 356 262 10ms 15 Jun 2023 584th EnviloN 🇨🇿 355 263 10ms 20 Oct 2024 584th JunkIce 355 263 16ms 12 Feb 2025 586th junkondo-jp 355 307 10ms 11 Jun 2024 587th msbranicky 353 264 18ms 3 Jul 2023 588th omurakazuaki 🇯🇵 352 310 10ms 13 Feb 2021 588th eranws 352 310 11ms 24 Oct 2022 590th msbranicky 352 458 367ms 31 Aug 2023 591st marcin7Cd 351 431 5ms 5 Apr 2021 592nd gotbadger 349 231 38ms 21 Nov 2024 593rd smclaughlin-cf 349 312 11ms 15 Apr 2025 594th fgrosshans 🇫🇷 348 268 11ms 9 Jul 2024 595th ericlangedijk 🇸🇮 348 306 433ms 18 Mar 2022 596th johnkiernander 348 313 16ms 12 Dec 2025 597th scpchicken 🇵🇼 348 409 5ms 19 Apr 2023 598th yokasuretsu 347 269 10ms 19 Apr 2018 599th MeWhenI 🇻🇦 346 273 179ms 3 Aug 2024 600th pandapawskat 346 306 2ms 27 Aug 2021 601st lukasmoellerch 345 316 10ms 15 Jul 2019 601st 1231234md5 🇨🇳 345 316 12ms 29 Jan 2024 603rd nullie 343 272 11ms 9 Jun 2022 604th mintypython 342 319 10ms 19 Oct 2018 605th blaztoma 🇱🇹 341 201 3ms 22 Oct 2025 606th dokutan 340 278 141ms 21 Aug 2024 607th dokutan 338 902 11ms 24 Dec 2024 608th jahakari 337 316 403ms 21 Nov 2021 609th gnlow 🇰🇷 336 324 12ms 25 Apr 2020 610th eshilo-draper 334 279 10ms 21 Sep 2022 610th Ythaenagor 334 279 10ms 5 Aug 2024 612th Florian-Mt 334 326 11ms 13 Nov 2023 613th graft 333 242 35ms 11 Mar 2018 614th geofft 333 280 11ms 14 Dec 2020 615th titpetric 333 484 304ms 20 Apr 2020 616th Re-Adventures 🇮🇳 332 281 14ms 10 Oct 2020 617th luuumine 🇫🇷 331 282 11ms 27 Oct 2025 618th yokasuretsu 330 244 39ms 19 Apr 2018 619th dokutan 330 427 102ms 13 Sep 2025 620th labster 329 344 5ms 10 Mar 2018 621st JunkIce 328 263 522ms 12 Feb 2025 622nd neihousaigaai 327 285 12ms 27 Dec 2021 623rd pg98 327 333 11ms 5 Sep 2019 624th alemelis 326 267 959ms 4 Mar 2024 625th The-Wolfson 325 531 274ms 1 Nov 2024 626th shreyasminocha 323 337 11ms 2 Aug 2020 627th msbranicky 323 401 2ms 14 Oct 2023 628th not-optikk 🇺🇸 323 457 1ms 16 Oct 2020 629th msbranicky 322 268 616ms 17 Jan 2024 630th WalrusesAreAwesome 322 374 2ms 20 Feb 2026 631st guilhem-roy 🇫🇷 320 291 11ms 3 Mar 2022 632nd evanrittner 319 292 10ms 26 Feb 2021 632nd randolchance 319 292 10ms 20 Jun 2025 634th bac0id 319 334 480ms 4 Jul 2024 635th modellking 319 354 5ms 22 Mar 2018 636th juliansiebert 🇩🇪 318 290 417ms 15 Jun 2025 637th jmerle 🇳🇱 317 294 12ms 11 Jul 2023 638th kjhughes097 🇬🇧 317 336 486ms 9 Dec 2020 639th dokutan 317 877 1,681ms 12 Jan 2025 640th dokutan 316 546 1,026ms 3 Feb 2026 First Prev 561–640 of 1,003 Next Last
