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 bytes. 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 Bytes Time Submitted 641st madex 🇩🇪 543 185 1ms 23 Jul 2025 642nd ThatAlo 542 211 10ms 11 May 2023 642nd RaBa21 🇭🇺 542 211 9ms 19 Jul 2025 644th yzhs 🇩🇪 540 245 148ms 25 Jun 2023 645th Kloppermand 🇩🇰 539 212 10ms 26 May 2023 645th mdnestor 539 212 9ms 27 May 2024 647th KatieLG-Transpiler 🇬🇧 538 180 776ms 16 Aug 2024 648th Yewzir 🇧🇪 538 229 11ms 30 Dec 2024 649th dokutan 537 227 3ms 29 Apr 2025 650th Mabeloid 🇳🇴 535 188 2ms 2 Oct 2024 651st adoxography 534 128 57ms 22 May 2023 652nd Mikey-Beep 🇬🇧 531 215 16ms 28 Aug 2023 653rd msbranicky 530 259 1ms 11 Oct 2023 654th lelbal 529 216 10ms 17 Oct 2024 654th yjgnaw 529 216 9ms 24 Jul 2025 656th Yewzir 🇧🇪 526 184 502ms 4 Feb 2024 657th mrmena 🇦🇺 524 213 8ms 29 Mar 2024 658th KatieLG 🇬🇧 521 311 2ms 1 May 2023 659th JunkIce 520 186 755ms 24 Jan 2025 659th dokutan 520 186 837ms 8 Apr 2025 661st logalex8369 🇺🇸 517 216 14ms 116 mins ago 662nd kzheng808 517 221 9ms 14 Jun 2023 662nd elgan65536 517 221 10ms 9 Nov 2024 662nd AstroOrbis 517 221 10ms 23 days ago 665th MeWhenI 🇻🇦 517 528 12ms 28 Aug 2023 666th msbranicky 515 202 85ms 18 Aug 2023 667th Masttest 515 222 9ms 31 Jan 2024 667th yokasuretsu 515 222 9ms 14 Jan 2025 669th snoozingnewt 🇨🇦 515 279 108ms 8 Oct 2025 670th daniel-cardone 514 217 9ms 8 Sep 2023 671st jerrandolph 512 312 284ms 2 Nov 2023 672nd MeWhenI 🇻🇦 510 163 2ms 1 May 2023 673rd DrPrettyman 508 225 9ms 25 May 2023 673rd mrmena 🇦🇺 508 225 9ms 29 Mar 2024 675th TheZwierzLF 🇵🇱 507 191 447ms 26 days ago 676th m42km 506 226 9ms 3 Feb 2024 677th Schmitt-Very-Cool 506 275 486ms 26 Sep 2025 678th ridingqwerty 🇺🇸 503 227 9ms 30 Jan 2024 679th klixel 🇨🇦 503 345 173ms 23 Jul 2025 680th FortuiteMan 🇫🇷 501 228 16ms 11 Jul 2025 681st msbranicky 497 174 241ms 9 Jan 2025 682nd galloj 🇨🇿 497 230 15ms 8 May 2023 683rd jameswmccarty 495 231 9ms 6 Apr 2025 684th Yewzir 🇧🇪 493 245 2,716ms 9 Feb 2024 685th Natanaelel 🇸🇪 492 269 155ms 5 May 2023 686th keelimeguy 🇺🇸 484 236 29ms 6 May 2025 687th prplz 🇦🇺 483 208 1ms 9 May 2023 688th ItsMeNoobieboy 480 238 9ms 6 May 2023 689th dokutan 479 244 154ms 29 Jun 2024 690th madex 🇩🇪 479 362 257ms 20 Jul 2025 691st dokutan 478 143 51ms 21 Apr 2025 692nd msbranicky 473 217 4,022ms 9 Jan 2025 693rd HenryTy83 473 236 9ms 3 May 2023 694th Yewzir 🇧🇪 472 213 2ms 9 Feb 2024 695th janbehrens 🇩🇪 471 208 53ms 1 May 2023 696th madex 🇩🇪 469 146 38ms 20 Jul 2025 697th Yewzir 🇧🇪 464 228 405ms 11 Feb 2024 698th aksyristos 464 246 10ms 28 Oct 2024 699th Jacob-Gendelman 463 247 9ms 27 Jul 2023 699th epic-programmer-guy 463 247 10ms 1 Jan 2024 701st dokutan 462 277 1ms 16 Jul 2024 702nd The-Wolfson 461 312 153ms 9 Feb 2025 703rd IISResetMe 454 168 276ms 24 Feb 2024 704th KatieLG 🇬🇧 453 187 963ms 1 May 2023 705th dokutan 447 360 42ms 25 Aug 2024 706th jtaxen 445 257 10ms 26 Apr 2024 707th xPMo 441 222 3ms 28 Jun 2024 708th MassimoParisi 441 259 12ms 20 Sep 2024 709th tomh1012 439 241 439ms 17 Sep 2025 710th snoozingnewt 🇨🇦 438 147 353ms 31 Oct 2025 711th ridingqwerty 🇺🇸 436 222 548ms 22 Jan 2024 712th cmccandless 434 263 9ms 16 Oct 2023 713th stephanie-flower 431 259 8ms 2 Nov 2025 714th bac0id 431 280 495ms 11 Jan 2025 715th dokutan 428 394 1ms 6 Dec 2024 716th puffertron 423 270 9ms 10 Jan 2024 716th ComputerKWasTaken 🇺🇸 423 270 9ms 21 Jan 2025 718th TheZwierzLF 🇵🇱 422 162 40ms 23 hours ago 719th OCNeve 422 271 9ms 18 Jun 2024 720th apokryfos 421 265 10ms 20 Aug 2023 First Prev 641–720 of 832 Next Last