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 561st snoozingnewt 🇨🇦 560 175 408ms 31 Oct 2025 562nd snoozingnewt 🇨🇦 559 145 739ms 31 Oct 2025 563rd MeWhenI 🇻🇦 558 98 2ms 1 May 2023 564th OllieBoyne 🇬🇧 558 146 10ms 1 May 2023 564th Chimplement 558 146 9ms 13 Dec 2023 566th KatieLG 🇬🇧 557 287 2ms 1 May 2023 567th commandblockguy 🇺🇸 555 147 16ms 1 May 2023 567th SniperSmiley 🇺🇸 555 147 9ms 15 Aug 2023 567th fourth-bit 555 147 15ms 2 Jul 2024 567th logvp 555 147 9ms 7 Oct 2024 571st MeWhenI 🇻🇦 555 229 40ms 26 Aug 2023 572nd Mabeloid 🇳🇴 553 137 715ms 4 May 2025 573rd MeWhenI 🇻🇦 553 296 32ms 6 Jun 2023 574th vhoulbreque 🇫🇷 551 148 10ms 15 days ago 575th weliveinhell 🇭🇹 551 174 9ms 25 Sep 2023 576th Shanethegamer 🇺🇸 551 274 174ms 17 May 2023 577th commandblockguy 🇺🇸 549 138 693ms 1 Sep 2025 578th ovs-code 🇩🇪 548 165 3ms 27 Sep 2024 579th scpchicken 🇵🇼 547 149 9ms 1 May 2023 579th Vaekor 547 149 9ms 9 Jul 2023 579th Emutis 🇱🇹 547 149 9ms 26 Oct 2025 582nd MeWhenI 🇻🇦 546 325 1,665ms 7 Nov 2025 583rd edsrzf 🇳🇿 545 156 67ms 3 Jul 2025 584th acollett89 545 176 9ms 8 Aug 2025 585th jerrandolph 545 288 284ms 2 Nov 2023 586th DialFrost 🇸🇬 544 151 128ms 28 Oct 2024 587th dokutan 542 246 45ms 26 Aug 2024 588th FranklinJiaChen 540 151 10ms 3 Aug 2024 588th Anonymousellama21 540 151 9ms 9 Aug 2024 590th dokutan 538 230 3ms 5 Feb 2025 591st MeWhenI 🇻🇦 537 287 46ms 3 Jul 2023 592nd AbhilashaTandon 536 152 9ms 21 Sep 2023 593rd snoozingnewt 🇨🇦 536 196 101ms 31 Oct 2025 594th Maximizer02 535 185 7ms 10 Jan 2025 595th AlephSquirrel 533 153 9ms 1 May 2023 595th MaxElf999 533 153 9ms 2 May 2023 595th eiburns 533 153 9ms 5 May 2023 598th AlephSquirrel 530 143 593ms 21 Jan 2024 599th madex 🇩🇪 525 185 1ms 23 Jul 2025 600th Natanaelel 🇸🇪 525 245 155ms 5 May 2023 601st adoxography 524 183 9ms 22 May 2023 602nd hellwue 523 156 10ms 3 May 2023 602nd hiichbindermax 523 156 9ms 4 May 2023 604th dokutan 518 119 51ms 21 Apr 2025 605th Yewzir 🇧🇪 518 221 2,716ms 9 Feb 2024 606th MeWhenI 🇻🇦 517 160 14ms 21 May 2023 607th Mabeloid 🇳🇴 517 188 2ms 2 Oct 2024 608th alemelis 516 158 9ms 5 Oct 2024 608th Andrey135296 516 158 9ms 24 Nov 2024 610th Yewzir 🇧🇪 514 189 2ms 9 Feb 2024 611th andrewjc2000 513 159 9ms 30 Apr 2025 612th snoozingnewt 🇨🇦 512 147 666ms 21 days ago 613th dokutan 512 220 154ms 29 Jun 2024 614th IISResetMe 510 144 276ms 24 Feb 2024 615th snoozingnewt 🇨🇦 510 296 189ms 31 Oct 2025 616th mrmena 🇦🇺 507 189 8ms 29 Mar 2024 617th snoozingnewt 🇨🇦 507 279 108ms 8 Oct 2025 618th chartung17 506 161 9ms 1 Jan 2024 619th Yewzir 🇧🇪 505 245 3ms 18 Jan 2024 620th tobyLovick 503 162 9ms 29 Nov 2023 621st Yewzir 🇧🇪 502 197 9ms 4 Apr 2024 622nd msbranicky 502 231 2ms 28 Sep 2023 623rd Babafaba 500 163 9ms 25 Oct 2025 624th logalex8369 🇺🇸 499 192 14ms 33 mins ago 625th emgordon154 497 124 44ms 26 Jul 2024 626th KatieLG 🇬🇧 497 163 963ms 1 May 2023 627th adoxography 497 164 9ms 22 May 2023 627th nstearns96 🇬🇧 497 164 9ms 12 Nov 2024 627th snydej 497 164 9ms 21 Nov 2024 630th daniel-cardone 497 193 9ms 8 Sep 2023 631st MeWhenI 🇻🇦 496 163 2ms 1 May 2023 632nd Babafaba 495 153 684ms 25 Oct 2025 633rd rozium 494 165 9ms 11 Oct 2024 633rd madex 🇩🇪 494 165 10ms 20 Jul 2025 635th The-Wolfson 492 288 153ms 9 Feb 2025 636th msbranicky 491 166 9ms 5 Aug 2023 637th Schmitt-Very-Cool 488 273 486ms 26 Sep 2025 638th andre-lameirinhas 🇵🇹 485 168 9ms 5 May 2023 638th croc54 485 168 9ms 2 Dec 2024 638th BREMAUCY 🇫🇷 485 168 10ms 21 Aug 2025 First Prev 561–640 of 828 Next Last