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 xPMo 483 198 3ms 28 Jun 2024 642nd ehulinsky 🇺🇸 482 169 9ms 16 May 2023 642nd briankuder 482 169 9ms 20 Jun 2023 644th adoxography 481 128 57ms 22 May 2023 645th kaptsanovb 480 170 9ms 24 Sep 2023 645th Flekay 🇩🇪 480 170 10ms 10 Jul 2025 647th janbehrens 🇩🇪 478 200 10ms 1 May 2023 648th TaserTheFox 🇺🇸 477 171 10ms 1 May 2023 649th MeWhenI 🇻🇦 476 528 12ms 28 Aug 2023 650th CedricGebistorf 474 172 9ms 3 May 2023 650th inverseLorentz 🇦🇺 474 172 10ms 8 May 2023 650th stertooy 🇧🇪 474 172 28ms 20 Jun 2024 653rd TheZwierzLF 🇵🇱 471 173 14ms 21 May 2025 654th klixel 🇨🇦 470 321 173ms 23 Jul 2025 655th prplz 🇦🇺 467 208 1ms 9 May 2023 656th celiendonze 🇨🇭 463 176 9ms 3 May 2023 657th PhysicDev 🇫🇷 461 177 9ms 25 May 2023 658th yuchuehw 458 178 9ms 3 Jan 2024 659th msbranicky 457 166 540ms 17 Jan 2024 660th mbittner20 455 179 9ms 27 May 2023 660th Wildst 455 179 9ms 7 Jul 2023 660th Matter1024 🇮🇳 455 179 9ms 15 Nov 2025 663rd msbranicky 455 217 4,022ms 9 Jan 2025 664th TheZwierzLF 🇵🇱 454 167 447ms 26 days ago 665th MeWhenI 🇻🇦 454 181 140ms 25 Oct 2024 666th KatieLG-Transpiler 🇬🇧 453 180 10ms 16 Aug 2024 667th HenryTy83 452 212 9ms 3 May 2023 668th tomh1012 452 217 439ms 17 Sep 2025 669th bobbysq 448 182 9ms 25 May 2023 670th TheZwierzLF 🇵🇱 447 138 40ms 19 hours ago 671st bac0id 447 256 495ms 11 Jan 2025 672nd dokutan 446 203 3ms 29 Apr 2025 673rd KatieLG 🇬🇧 443 139 32ms 29 Aug 2024 674th Stockoh 🇫🇷 443 184 10ms 1 May 2024 675th Natanaelel 🇸🇪 434 188 9ms 5 May 2023 675th Kloppermand 🇩🇰 434 188 10ms 26 May 2023 675th mdnestor 434 188 9ms 27 May 2024 678th msbranicky 432 174 241ms 9 Jan 2025 679th epic-programmer-guy 432 298 148ms 15 Apr 2024 680th Yewzir 🇧🇪 430 228 405ms 11 Feb 2024 681st KatieLG 🇬🇧 428 311 519ms 19 Oct 2024 682nd Mikey-Beep 🇬🇧 427 191 16ms 28 Aug 2023 683rd lelbal 425 192 10ms 17 Oct 2024 683rd yjgnaw 425 192 9ms 24 Jul 2025 685th madex 🇩🇪 422 146 38ms 20 Jul 2025 686th rollershutter 422 193 9ms 3 May 2023 687th dokutan 422 394 1ms 6 Dec 2024 688th KatieLG-Transpiler 🇬🇧 421 180 776ms 16 Aug 2024 689th madex 🇩🇪 417 362 257ms 20 Jul 2025 690th adamnielson42 🇺🇸 416 196 9ms 1 May 2023 691st elgan65536 414 197 10ms 9 Nov 2024 691st AstroOrbis 414 197 10ms 23 days ago 693rd MeWhenI 🇻🇦 414 300 4ms 13 Dec 2023 694th bac0id 413 235 2ms 11 Jan 2025 695th Yewzir 🇧🇪 412 184 502ms 4 Feb 2024 696th Masttest 412 198 9ms 31 Jan 2024 696th yokasuretsu 412 198 9ms 14 Jan 2025 698th SirFireball3521 408 132 237ms 26 Feb 2024 699th stephanie-flower 408 235 8ms 2 Nov 2025 700th DrPrettyman 406 201 9ms 25 May 2023 700th mrmena 🇦🇺 406 201 9ms 29 Mar 2024 702nd Maashau 405 240 2ms 3 days ago 703rd m42km 404 202 9ms 3 Feb 2024 704th Widgitty 403 241 2ms 23 Sep 2025 705th ridingqwerty 🇺🇸 402 203 9ms 30 Jan 2024 706th FortuiteMan 🇫🇷 400 204 16ms 11 Jul 2025 707th AbuzarN 398 205 16ms 22 Nov 2023 708th apokryfos 398 241 10ms 20 Aug 2023 708th JOrE20 🇺🇸 398 241 9ms 15 Nov 2025 710th galloj 🇨🇿 396 206 15ms 8 May 2023 711th jameswmccarty 394 207 9ms 6 Apr 2025 712th dokutan 391 318 4ms 7 Dec 2024 713th KatieLG 🇬🇧 388 192 4ms 1 May 2023 714th MeWhenI 🇻🇦 388 412 2ms 1 May 2023 715th ThatAlo 386 211 10ms 11 May 2023 716th dokutan 385 249 9ms 29 Mar 2025 717th ridingqwerty 🇺🇸 383 198 548ms 22 Jan 2024 718th ItsMeNoobieboy 381 214 9ms 6 May 2023 719th fischfood 378 277 4ms 15 Aug 2024 720th yuchuehw 378 352 449ms 3 Jan 2024 First Prev 641–720 of 826 Next Last