The Calendar hole will go live in approximately 9 days. Why not try and solve it 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 481st hoodadam 440 212 10ms 12 Jun 2019 481st mhsaul 440 212 11ms 10 Apr 2023 481st ceeb9 440 212 12ms 14 Jun 2024 481st Pulencode 🇨🇨 440 212 9ms 17 Nov 2024 485th jaredcrystal 🇺🇸 438 184 50ms 14 Dec 2020 486th arctouch-cristiannevianna 437 244 386ms 29 Feb 2024 487th janbehrens 🇩🇪 435 277 2ms 21 Mar 2022 488th pickerj 434 215 10ms 4 Jun 2024 488th frankgraziano 434 215 16ms 5 Apr 2025 490th Indivicivet 432 216 17ms 19 Oct 2021 491st villfa 432 262 4ms 21 May 2019 492nd snoozingnewt 🇨🇦 432 326 97ms 23 Oct 2025 493rd scpchicken 🇵🇼 429 170 227ms 25 Feb 2023 494th ArmaanAS 428 218 11ms 26 Mar 2021 494th Lwi-Sandwich 428 218 10ms 20 Jul 2023 496th bbakersmith 427 334 24ms 31 Jul 2021 497th stefangimmillaro 426 264 2ms 28 Oct 2025 498th GrayJoKing 🇦🇺 426 811 2ms 23 Jul 2020 499th emgordon154 424 243 4,457ms 17 May 2025 500th two-bad 🇬🇧 424 257 10ms 28 Feb 2024 501st Giantnoodlemonster 424 284 2ms 29 Sep 2024 502nd jwhear 🇺🇸 423 408 1,843ms 30 Sep 2024 503rd zuparnowa 422 221 10ms 8 Feb 2019 503rd froggy2001 422 221 16ms 16 Feb 2023 505th helbling 🇨🇭 419 260 10ms 15 Jun 2024 506th yzhs 🇩🇪 419 262 32ms 6 Sep 2020 507th msbranicky 419 371 2ms 12 Aug 2023 508th ian-h-chamberlain 🇺🇸 417 348 42ms 21 Oct 2025 509th didion0 🇺🇸 415 263 9ms 2 Feb 2021 510th hamhub7 413 258 355ms 18 Aug 2022 511th mathisfun271 411 227 9ms 18 Dec 2023 511th yuchuehw 411 227 11ms 4 Jan 2024 513th varhammer 🇷🇺 410 369 9ms 23 Nov 2021 514th janbehrens 🇩🇪 408 168 2ms 23 Sep 2021 515th yzhs 🇩🇪 408 438 120ms 25 Jul 2021 516th amollberg 🇸🇪 407 229 17ms 16 Jan 2022 517th ejmejm 405 230 11ms 2 Dec 2021 517th Flekay 🇩🇪 405 230 12ms 11 Jul 2025 519th postie77 405 263 373ms 10 May 2023 520th moikaturns 🇬🇧 404 270 9ms 10 Nov 2022 521st argusdusty 🇺🇸 400 233 16ms 11 Jan 2021 521st moustave 400 233 10ms 28 Mar 2025 523rd revlayle 🇺🇸 399 267 377ms 23 Jun 2023 524th madex 🇩🇪 398 303 2ms 11 Jun 2025 525th olleicua 🇺🇸 397 203 52ms 1 Apr 2024 526th erin-allison 396 242 275ms 31 Mar 2021 527th Schmitt-Very-Cool 394 351 576ms 2 Oct 2025 528th iznax 390 273 364ms 21 Nov 2021 529th fitzdotlol 🇺🇸 389 280 16ms 21 Mar 2022 530th labster 388 188 210ms 10 Mar 2018 531st Phanabani 🇺🇸 388 240 10ms 22 Oct 2020 532nd ericlangedijk 🇸🇮 388 482 61ms 23 Feb 2022 533rd wh3n3v3r 🇨🇿 387 282 9ms 11 Nov 2024 534th snoozingnewt 🇨🇦 385 360 533ms 14 Sep 2025 535th DaCoolOne 384 385 2ms 27 Feb 2020 536th yuchuehw 381 363 669ms 4 Jan 2024 537th MeWhenI 🇻🇦 381 729 677ms 9 Feb 2025 538th bastienvoirin 🇫🇷 379 246 10ms 30 Nov 2020 539th LucaArgentiUCF 🇮🇹 378 476 46ms 25 Jan 2021 540th neihousaigaai 377 289 9ms 15 Mar 2021 541st Blendi-Goose 376 393 2ms 5 Oct 2025 542nd jgbaldwinbrown 376 429 315ms 9 Jul 2021 543rd ian-h-chamberlain 🇺🇸 376 453 219ms 4 Aug 2022 544th dokutan 373 388 7ms 2 Apr 2024 545th yokasuretsu 372 196 213ms 4 May 2018 546th petar-donchev 371 251 10ms 7 Sep 2019 547th ForkKILLET 🇨🇳 371 294 9ms 21 Feb 2021 547th CaedenHarper 🇨🇦 371 294 9ms 6 Nov 2025 549th Natanaelel 🇸🇪 370 304 3ms 23 Jun 2023 550th jerrandolph 370 436 322ms 3 Nov 2023 551st Yewzir 🇧🇪 369 467 1,899ms 7 May 2024 552nd CallanMcNulty 368 296 9ms 20 Mar 2022 553rd LukeBridges 🇬🇧 367 297 10ms 20 Aug 2024 554th Yewzir 🇧🇪 366 255 10ms 19 May 2023 554th Babafaba 366 255 17ms 11 Nov 2025 556th tomh1012 366 298 9ms 14 Sep 2020 556th GeorgeStechman 🇬🇧 366 298 9ms 20 Nov 2022 558th BuBuaBu 366 404 1ms 30 Aug 2023 559th LSWdigital 365 397 13ms 15 Dec 2021 560th 0xjac 🇨🇭 365 442 281ms 9 Jun 2025 First Prev 481–560 of 979 Next Last