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 561st BlankSpruce 632 159 1ms 26 Aug 2024 562nd NickTheEASDude 🇺🇸 631 203 2ms 9 Oct 2024 563rd snoozingnewt 🇨🇦 631 253 276ms 31 Oct 2025 564th bobbysq 628 182 9ms 25 May 2023 564th Andrey135296 628 182 9ms 24 Nov 2024 566th Shanethegamer 🇺🇸 627 166 85ms 13 May 2023 567th GolfingSuccess 🇬🇷 624 161 1ms 1 May 2023 568th MeWhenI 🇻🇦 624 449 489ms 10 Feb 2025 569th MeWhenI 🇻🇦 623 139 705ms 15 Sep 2025 570th Stockoh 🇫🇷 621 184 10ms 1 May 2024 571st TFeld00 🇩🇰 616 111 53ms 3 Sep 2024 572nd ravnskjaer 🇩🇰 616 226 355ms 3 days ago 573rd tobyLovick 614 186 9ms 29 Nov 2023 574th jared-hughes 613 164 2ms 7 Sep 2023 575th Yewzir 🇧🇪 613 182 8ms 11 Feb 2024 576th DialFrost 🇸🇬 611 176 4ms 17 Jun 2024 577th Babafaba 611 187 9ms 25 Oct 2025 578th MeWhenI 🇻🇦 611 263 42ms 4 Sep 2024 579th adoxography 610 183 9ms 22 May 2023 580th KatieLG 🇬🇧 609 159 708ms 6 Apr 2025 581st Natanaelel 🇸🇪 608 188 9ms 5 May 2023 581st nstearns96 🇬🇧 608 188 9ms 12 Nov 2024 583rd blaztoma 🇱🇹 605 113 36ms 26 Oct 2025 584th snoozingnewt 🇨🇦 604 175 408ms 31 Oct 2025 585th Yewzir 🇧🇪 603 265 269ms 5 Jan 2024 586th retrohun 601 163 3ms 27 May 2023 587th MeWhenI 🇻🇦 601 173 111ms 1 May 2023 588th didion0 🇺🇸 600 186 9ms 2 May 2023 588th eranws 600 186 8ms 23 Dec 2024 590th snoozingnewt 🇨🇦 598 145 739ms 31 Oct 2025 591st MeWhenI 🇻🇦 598 218 3ms 24 Jul 2023 592nd MeWhenI 🇻🇦 597 98 2ms 1 May 2023 593rd KatieLG 🇬🇧 597 187 9ms 1 May 2023 594th JRaspass 🇬🇧 596 104 3ms 28 May 2023 595th MeWhenI 🇻🇦 596 325 1,665ms 7 Nov 2025 596th andre-lameirinhas 🇵🇹 595 192 9ms 5 May 2023 597th emgordon154 594 180 133ms 8 Aug 2024 598th MeWhenI 🇻🇦 594 181 4ms 28 May 2023 599th gifti258 593 202 69ms 14 Sep 2023 600th rollershutter 592 193 9ms 3 May 2023 600th Yewzir 🇧🇪 592 193 86ms 27 Jan 2024 602nd MeWhenI 🇻🇦 590 181 140ms 25 Oct 2024 603rd snoozingnewt 🇨🇦 589 147 666ms 21 days ago 604th kaptsanovb 589 194 9ms 24 Sep 2023 604th JunkIce 589 194 11ms 24 Jan 2025 604th dokutan 589 194 9ms 8 Apr 2025 607th snoozingnewt 🇨🇦 586 296 189ms 31 Oct 2025 608th dokutan 584 145 937ms 21 Apr 2025 609th msbranicky 583 166 540ms 17 Jan 2024 610th adamnielson42 🇺🇸 583 196 9ms 1 May 2023 610th inverseLorentz 🇦🇺 583 196 10ms 8 May 2023 610th stertooy 🇧🇪 583 196 28ms 20 Jun 2024 613th adyache 🇺🇸 583 209 7ms 24 May 2023 614th 5pyr 582 220 2ms 16 May 2023 614th Sciman101 582 220 1ms 16 May 2023 616th kkoenig 581 275 270ms 13 Sep 2024 617th tatzyr 🇯🇵 580 118 38ms 24 Feb 2025 618th TheZwierzLF 🇵🇱 580 197 14ms 21 May 2025 619th sanscheese 579 107 4ms 21 Jul 2023 619th snoozingnewt 🇨🇦 579 107 3ms 31 Oct 2025 621st adyache 🇺🇸 578 183 436ms 4 May 2023 622nd retrohun 577 144 2ms 27 May 2023 623rd KrausRaus 🇺🇸 574 239 2ms 11 Oct 2023 624th Yewzir 🇧🇪 572 245 3ms 18 Jan 2024 625th celiendonze 🇨🇭 571 200 9ms 3 May 2023 626th MeWhenI 🇻🇦 569 214 3ms 1 May 2023 627th PhysicDev 🇫🇷 568 201 9ms 25 May 2023 628th MeWhenI 🇻🇦 565 229 40ms 26 Aug 2023 629th weliveinhell 🇭🇹 564 198 9ms 25 Sep 2023 630th Wildst 563 203 9ms 7 Jul 2023 631st snoozingnewt 🇨🇦 562 185 85ms 31 Oct 2025 632nd MeWhenI 🇻🇦 561 296 32ms 6 Jun 2023 633rd Yewzir 🇧🇪 559 237 12ms 4 Apr 2024 634th acollett89 558 200 9ms 8 Aug 2025 635th AbuzarN 557 205 16ms 22 Nov 2023 636th msbranicky 554 231 2ms 28 Sep 2023 637th emgordon154 552 124 44ms 26 Jul 2024 638th dokutan 552 254 3ms 5 Feb 2025 639th Babafaba 547 177 684ms 25 Oct 2025 640th MeWhenI 🇻🇦 546 287 46ms 3 Jul 2023 First Prev 561–640 of 832 Next Last