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 481st prplz 🇦🇺 618 132 9ms 12 May 2023 481st uttumuttu 🇫🇮 618 132 9ms 22 Dec 2023 481st edsrzf 🇳🇿 618 132 10ms 7 days ago 484th rucin93 🇵🇱 618 133 135ms 21 Feb 2025 485th edsrzf 🇳🇿 616 147 3ms 26 days ago 486th emgordon154 614 246 175ms 14 Mar 2025 487th annaproxy 613 133 9ms 1 May 2023 487th ryyyn 🇺🇸 613 133 9ms 18 Jan 2025 489th MeWhenI 🇻🇦 613 187 495ms 1 May 2023 490th MeWhenI 🇻🇦 612 120 229ms 1 May 2023 491st janbehrens 🇩🇪 612 123 661ms 1 May 2023 492nd iczelia 🇩🇪 611 157 8ms 23 Oct 2025 493rd BlankSpruce 611 159 1ms 26 Aug 2024 494th DialFrost 🇸🇬 610 101 37ms 2 Jun 2024 495th bricknellj 608 134 9ms 9 Jul 2024 496th MeWhenI 🇻🇦 608 425 489ms 10 Feb 2025 497th Yewzir 🇧🇪 607 158 8ms 11 Feb 2024 498th billings7 🇬🇧 605 162 366ms 20 May 2024 499th SirBogman 🇺🇸 604 102 41ms 28 Aug 2023 500th GolfingSuccess 🇬🇷 603 161 1ms 1 May 2023 501st Bmrl7 599 136 9ms 20 Feb 2024 502nd Yewzir 🇧🇪 597 263 268ms 5 Jan 2024 503rd emgordon154 596 166 8ms 7 Jan 2025 504th edsrzf 🇳🇿 595 111 2ms 16 Jun 2025 505th xdaniel-lim 595 137 9ms 27 Jan 2025 505th Mabeloid 🇳🇴 595 137 9ms 4 May 2025 507th ravnskjaer 🇩🇰 594 224 355ms 3 days ago 508th CaedenHarper 🇨🇦 592 128 570ms 11 Aug 2025 509th didion0 🇺🇸 592 162 9ms 2 May 2023 509th eranws 592 162 8ms 23 Dec 2024 509th a6166231 🇨🇳 592 162 9ms 16 May 2025 512th jared-hughes 592 164 2ms 7 Sep 2023 513th zbreit 🇺🇸 591 138 15ms 5 May 2023 513th StefanHabel 🇨🇦 591 138 10ms 13 Aug 2023 513th markusgraube 591 138 10ms 26 Mar 2024 516th postie77 591 166 394ms 11 Jul 2023 517th 5pyr 591 196 2ms 16 May 2023 517th Sciman101 591 196 1ms 16 May 2023 519th Yewzir 🇧🇪 589 205 11ms 30 Dec 2024 520th DialFrost 🇸🇬 588 129 728ms 17 Jan 2024 521st KatieLG 🇬🇧 588 163 9ms 1 May 2023 522nd Shanethegamer 🇺🇸 588 166 85ms 13 May 2023 523rd zhaohm14 587 139 9ms 23 Jul 2025 523rd blaztoma 🇱🇹 587 139 10ms 18 days ago 523rd YAJUE114514 587 139 10ms 4 days ago 526th MeWhenI 🇻🇦 586 218 3ms 24 Jul 2023 527th MeWhenI 🇻🇦 584 139 705ms 15 Sep 2025 528th sanscheese 583 103 4ms 21 Jul 2023 529th ahmetdemirag 🇨🇾 582 140 10ms 30 Oct 2024 530th yzhs 🇩🇪 582 221 148ms 25 Jun 2023 531st MeWhenI 🇻🇦 579 131 569ms 24 May 2024 532nd msbranicky 579 214 2ms 17 Aug 2023 533rd rschwa6308 🇺🇸 578 141 16ms 5 May 2023 533rd MeWhenI 🇻🇦 578 141 9ms 26 Feb 2025 535th MeWhenI 🇻🇦 578 181 4ms 28 May 2023 536th msbranicky 575 235 1ms 11 Oct 2023 537th GolfingSuccess 🇬🇷 574 142 9ms 1 May 2023 537th janbehrens 🇩🇪 574 142 10ms 1 May 2023 537th MichalMarsalek 🇨🇿 574 142 9ms 1 May 2023 537th doktoren 574 142 9ms 7 Dec 2023 537th KasperKivimaeki 🇫🇮 574 142 9ms 2 Nov 2025 542nd adyache 🇺🇸 573 171 398ms 4 May 2023 543rd kkoenig 571 275 270ms 13 Sep 2024 544th GolfingSuccess 🇬🇷 570 133 677ms 2 Mar 2024 545th guilhem-roy 🇫🇷 570 143 9ms 29 Jun 2023 545th knutae 🇳🇴 570 143 9ms 13 Nov 2023 545th davecame 570 143 15ms 30 Nov 2023 545th keelimeguy 🇺🇸 570 143 30ms 7 May 2025 545th stefangimmillaro 570 143 11ms 23 May 2025 550th Aurel300 🇨🇭 568 266 204ms 21 Jul 2024 551st cros107 🇦🇺 566 144 9ms 26 Oct 2023 552nd msbranicky 566 267 179ms 1 Oct 2023 553rd MeWhenI 🇻🇦 565 173 111ms 1 May 2023 553rd snoozingnewt 🇨🇦 565 173 83ms 18 Oct 2025 555th dokutan 565 205 1ms 22 Apr 2024 556th SirBogman 🇺🇸 562 135 747ms 16 Jan 2024 557th mathisfun271 562 145 10ms 18 Feb 2024 557th neihousaigaai 562 145 9ms 10 Apr 2025 559th Shanethegamer 🇺🇸 562 147 15ms 17 May 2023 560th snoozingnewt 🇨🇦 561 107 3ms 31 Oct 2025 First Prev 481–560 of 828 Next Last