The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Forsyth–Edwards Notation 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 641st msbranicky 484 202 85ms 18 Aug 2023 642nd xPMo 483 198 3ms 28 Jun 2024 643rd ehulinsky 🇺🇸 482 169 9ms 16 May 2023 643rd briankuder 482 169 9ms 20 Jun 2023 645th adoxography 481 128 57ms 22 May 2023 646th kaptsanovb 480 170 9ms 24 Sep 2023 646th Flekay 🇩🇪 480 170 10ms 10 Jul 2025 648th janbehrens 🇩🇪 478 200 10ms 1 May 2023 649th TaserTheFox 🇺🇸 477 171 10ms 1 May 2023 650th MeWhenI 🇻🇦 476 528 12ms 28 Aug 2023 651st CedricGebistorf 474 172 9ms 3 May 2023 651st inverseLorentz 🇦🇺 474 172 10ms 8 May 2023 651st stertooy 🇧🇪 474 172 28ms 20 Jun 2024 654th TheZwierzLF 🇵🇱 471 173 14ms 21 May 2025 655th klixel 🇨🇦 470 321 173ms 23 Jul 2025 656th prplz 🇦🇺 467 208 1ms 9 May 2023 657th celiendonze 🇨🇭 463 176 9ms 3 May 2023 658th PhysicDev 🇫🇷 461 177 9ms 25 May 2023 659th yuchuehw 458 178 9ms 3 Jan 2024 660th msbranicky 457 166 540ms 17 Jan 2024 661st mbittner20 455 179 9ms 27 May 2023 661st Wildst 455 179 9ms 7 Jul 2023 661st Matter1024 🇮🇳 455 179 9ms 15 Nov 2025 664th msbranicky 455 217 4,022ms 9 Jan 2025 665th TheZwierzLF 🇵🇱 454 167 447ms 26 days ago 666th MeWhenI 🇻🇦 454 181 140ms 25 Oct 2024 667th KatieLG-Transpiler 🇬🇧 453 180 10ms 16 Aug 2024 668th HenryTy83 452 212 9ms 3 May 2023 669th tomh1012 452 217 439ms 17 Sep 2025 670th bobbysq 448 182 9ms 25 May 2023 671st TheZwierzLF 🇵🇱 447 138 40ms 22 hours ago 672nd bac0id 447 256 495ms 11 Jan 2025 673rd dokutan 446 203 3ms 29 Apr 2025 674th KatieLG 🇬🇧 443 139 32ms 29 Aug 2024 675th Stockoh 🇫🇷 443 184 10ms 1 May 2024 676th Natanaelel 🇸🇪 434 188 9ms 5 May 2023 676th Kloppermand 🇩🇰 434 188 10ms 26 May 2023 676th mdnestor 434 188 9ms 27 May 2024 679th msbranicky 432 174 241ms 9 Jan 2025 680th epic-programmer-guy 432 298 148ms 15 Apr 2024 681st Yewzir 🇧🇪 430 228 405ms 11 Feb 2024 682nd KatieLG 🇬🇧 428 311 519ms 19 Oct 2024 683rd Mikey-Beep 🇬🇧 427 191 16ms 28 Aug 2023 684th lelbal 425 192 10ms 17 Oct 2024 684th yjgnaw 425 192 9ms 24 Jul 2025 686th madex 🇩🇪 422 146 38ms 20 Jul 2025 687th rollershutter 422 193 9ms 3 May 2023 688th dokutan 422 394 1ms 6 Dec 2024 689th KatieLG-Transpiler 🇬🇧 421 180 776ms 16 Aug 2024 690th madex 🇩🇪 417 362 257ms 20 Jul 2025 691st adamnielson42 🇺🇸 416 196 9ms 1 May 2023 692nd elgan65536 414 197 10ms 9 Nov 2024 692nd AstroOrbis 414 197 10ms 23 days ago 694th MeWhenI 🇻🇦 414 300 4ms 13 Dec 2023 695th bac0id 413 235 2ms 11 Jan 2025 696th Yewzir 🇧🇪 412 184 502ms 4 Feb 2024 697th Masttest 412 198 9ms 31 Jan 2024 697th yokasuretsu 412 198 9ms 14 Jan 2025 699th SirFireball3521 408 132 237ms 26 Feb 2024 700th stephanie-flower 408 235 8ms 2 Nov 2025 701st DrPrettyman 406 201 9ms 25 May 2023 701st mrmena 🇦🇺 406 201 9ms 29 Mar 2024 703rd Maashau 405 240 2ms 3 days ago 704th m42km 404 202 9ms 3 Feb 2024 705th Widgitty 403 241 2ms 23 Sep 2025 706th ridingqwerty 🇺🇸 402 203 9ms 30 Jan 2024 707th FortuiteMan 🇫🇷 400 204 16ms 11 Jul 2025 708th AbuzarN 398 205 16ms 22 Nov 2023 709th apokryfos 398 241 10ms 20 Aug 2023 709th JOrE20 🇺🇸 398 241 9ms 15 Nov 2025 711th galloj 🇨🇿 396 206 15ms 8 May 2023 712th jameswmccarty 394 207 9ms 6 Apr 2025 713th dokutan 391 318 4ms 7 Dec 2024 714th KatieLG 🇬🇧 388 192 4ms 1 May 2023 715th MeWhenI 🇻🇦 388 412 2ms 1 May 2023 716th ThatAlo 386 211 10ms 11 May 2023 717th dokutan 385 249 9ms 29 Mar 2025 718th ridingqwerty 🇺🇸 383 198 548ms 22 Jan 2024 719th ItsMeNoobieboy 381 214 9ms 6 May 2023 720th fischfood 378 277 4ms 15 Aug 2024 First Prev 641–720 of 828 Next Last