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 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 jerrandolph 370 436 362ms 3 Nov 2023 562nd Yewzir 🇧🇪 369 467 1,899ms 7 May 2024 563rd CallanMcNulty 368 296 11ms 20 Mar 2022 564th LukeBridges 🇬🇧 367 297 10ms 20 Aug 2024 565th dokutan 367 388 7ms 2 Apr 2024 566th Yewzir 🇧🇪 366 255 11ms 19 May 2023 566th Babafaba 366 255 17ms 11 Nov 2025 568th tomh1012 366 298 10ms 14 Sep 2020 568th GeorgeStechman 🇬🇧 366 298 10ms 20 Nov 2022 570th BuBuaBu 366 404 1ms 30 Aug 2023 571st LSWdigital 365 397 14ms 15 Dec 2021 572nd 0xjac 🇨🇭 365 442 316ms 9 Jun 2025 573rd tobeannouncd 365 491 128ms 29 Apr 2024 574th mwarvik 🇳🇴 364 293 546ms 26 Dec 2025 575th pandapawskat 362 333 1ms 2 Sep 2021 576th strattonwhisler 361 302 11ms 22 Apr 2022 577th Kees-van-Beilen 360 303 10ms 14 May 2023 578th Bonjour27891 🇻🇳 359 260 13ms 10 Apr 2022 579th Babafaba 357 242 595ms 11 Nov 2025 580th ImpressedByRocks 357 261 15ms 19 Sep 2022 581st neihousaigaai 357 388 548ms 18 May 2021 582nd InigoK 🇺🇸 356 262 10ms 15 Jun 2023 583rd EnviloN 🇨🇿 355 263 10ms 20 Oct 2024 583rd JunkIce 355 263 16ms 12 Feb 2025 585th junkondo-jp 355 307 10ms 11 Jun 2024 586th msbranicky 353 264 18ms 3 Jul 2023 587th omurakazuaki 🇯🇵 352 310 10ms 13 Feb 2021 587th eranws 352 310 11ms 24 Oct 2022 589th msbranicky 352 458 367ms 31 Aug 2023 590th marcin7Cd 351 431 5ms 5 Apr 2021 591st gotbadger 349 231 38ms 21 Nov 2024 592nd smclaughlin-cf 349 312 11ms 15 Apr 2025 593rd fgrosshans 🇫🇷 348 268 11ms 9 Jul 2024 594th ericlangedijk 🇸🇮 348 306 433ms 18 Mar 2022 595th johnkiernander 348 313 16ms 12 Dec 2025 596th scpchicken 🇵🇼 348 409 5ms 19 Apr 2023 597th yokasuretsu 347 269 10ms 19 Apr 2018 598th MeWhenI 🇻🇦 346 273 179ms 3 Aug 2024 599th pandapawskat 346 306 2ms 27 Aug 2021 600th lukasmoellerch 345 316 10ms 15 Jul 2019 600th 1231234md5 🇨🇳 345 316 12ms 29 Jan 2024 602nd nullie 343 272 11ms 9 Jun 2022 603rd mintypython 342 319 10ms 19 Oct 2018 604th blaztoma 🇱🇹 341 201 3ms 22 Oct 2025 605th dokutan 340 278 141ms 21 Aug 2024 606th dokutan 338 902 11ms 24 Dec 2024 607th jahakari 337 316 403ms 21 Nov 2021 608th gnlow 🇰🇷 336 324 12ms 25 Apr 2020 609th eshilo-draper 334 279 10ms 21 Sep 2022 609th Ythaenagor 334 279 10ms 5 Aug 2024 611th Florian-Mt 334 326 11ms 13 Nov 2023 612th graft 333 242 35ms 11 Mar 2018 613th geofft 333 280 11ms 14 Dec 2020 614th titpetric 333 484 304ms 20 Apr 2020 615th Re-Adventures 🇮🇳 332 281 14ms 10 Oct 2020 616th luuumine 🇫🇷 331 282 11ms 27 Oct 2025 617th yokasuretsu 330 244 39ms 19 Apr 2018 618th dokutan 330 427 102ms 13 Sep 2025 619th labster 329 344 5ms 10 Mar 2018 620th JunkIce 328 263 522ms 12 Feb 2025 621st neihousaigaai 327 285 12ms 27 Dec 2021 622nd pg98 327 333 11ms 5 Sep 2019 623rd alemelis 326 267 959ms 4 Mar 2024 624th The-Wolfson 325 531 106ms 1 Nov 2024 625th shreyasminocha 323 337 11ms 2 Aug 2020 626th msbranicky 323 401 2ms 14 Oct 2023 627th not-optikk 🇺🇸 323 457 1ms 16 Oct 2020 628th msbranicky 322 268 616ms 17 Jan 2024 629th WalrusesAreAwesome 322 374 2ms 20 Feb 2026 630th guilhem-roy 🇫🇷 320 291 11ms 3 Mar 2022 631st evanrittner 319 292 10ms 26 Feb 2021 631st randolchance 319 292 10ms 20 Jun 2025 633rd bac0id 319 334 480ms 4 Jul 2024 634th modellking 319 354 5ms 22 Mar 2018 635th juliansiebert 🇩🇪 318 290 417ms 15 Jun 2025 636th jmerle 🇳🇱 317 294 12ms 11 Jul 2023 637th kjhughes097 🇬🇧 317 336 486ms 9 Dec 2020 638th dokutan 317 877 1,531ms 12 Jan 2025 639th dokutan 316 546 695ms 3 Feb 2026 640th martinnorling 🇸🇪 315 296 10ms 22 Feb 2022 First Prev 561–640 of 1,003 Next Last
