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 480th madex 🇩🇪 693 165 10ms 20 Jul 2025 482nd SirBogman 🇺🇸 692 93 144ms 28 Aug 2023 483rd CaedenHarper 🇨🇦 691 153 372ms 17 Oct 2025 484th BlankSpruce 690 175 433ms 28 Aug 2024 485th helbling 🇨🇭 689 162 9ms 24 Sep 2024 485th a6166231 🇨🇳 689 162 9ms 16 May 2025 487th msbranicky 688 166 9ms 5 Aug 2023 488th Yax42 🇫🇷 688 185 115ms 15 Oct 2025 489th pardouin 🇫🇷 684 100 39ms 23 Jul 2025 490th guilhem-roy 🇫🇷 684 167 9ms 29 Jun 2023 490th fkantelberg 684 167 10ms 25 Jul 2023 492nd croc54 680 168 9ms 2 Dec 2024 493rd MeWhenI 🇻🇦 680 195 6ms 9 May 2024 494th adamnielson42 🇺🇸 678 116 3ms 10 Jan 2024 495th DialFrost 🇸🇬 677 101 37ms 2 Jun 2024 496th AlephSquirrel 677 143 593ms 21 Jan 2024 497th zakariamouhid 676 165 9ms 11 May 2023 498th ehulinsky 🇺🇸 676 169 9ms 16 May 2023 498th briankuder 676 169 9ms 20 Jun 2023 498th jmerle 🇳🇱 676 169 9ms 11 Jul 2023 501st Shanethegamer 🇺🇸 675 149 2ms 1 May 2023 502nd Yax42 🇫🇷 674 179 3,043ms 14 Nov 2025 503rd snoozingnewt 🇨🇦 672 144 609ms 12 Oct 2025 504th janbehrens 🇩🇪 672 160 4ms 2 Jul 2023 505th OllieBoyne 🇬🇧 672 170 10ms 1 May 2023 505th Chimplement 672 170 9ms 13 Dec 2023 507th SirBogman 🇺🇸 671 102 41ms 28 Aug 2023 508th Shanethegamer 🇺🇸 671 124 1ms 2 May 2023 509th ZakkkkAttackkkk 🇵🇭 670 150 2ms 12 Nov 2023 510th Shanethegamer 🇺🇸 669 114 243ms 12 May 2023 511th TaserTheFox 🇺🇸 668 171 10ms 1 May 2023 512th DialFrost 🇸🇬 667 125 4ms 17 Aug 2024 513th emgordon154 667 243 2ms 10 Jun 2025 514th MeWhenI 🇻🇦 666 151 2ms 25 Aug 2023 515th Shanethegamer 🇺🇸 664 103 52ms 1 May 2023 516th niklv 🇷🇺 664 168 9ms 14 May 2023 517th CedricGebistorf 664 172 9ms 3 May 2023 517th luuumine 🇫🇷 664 172 10ms 9 Nov 2025 517th vhoulbreque 🇫🇷 664 172 10ms 15 days ago 520th Vaekor 660 173 9ms 9 Jul 2023 521st Yax42 🇫🇷 657 153 2ms 14 Oct 2025 522nd yzhs 🇩🇪 657 174 9ms 22 Jun 2023 523rd MeWhenI 🇻🇦 656 178 138ms 5 Sep 2023 524th edsrzf 🇳🇿 655 135 2ms 16 Jun 2025 525th msbranicky 655 214 2ms 17 Aug 2023 526th albanian-laundromat 654 148 521ms 4 Aug 2025 527th MeWhenI 🇻🇦 654 157 3,875ms 2 Dec 2024 527th aditsu 654 157 4,071ms 12 Aug 2025 529th MeWhenI 🇻🇦 653 160 14ms 21 May 2023 530th FranklinJiaChen 653 175 10ms 3 Aug 2024 531st angel-p57 🇯🇵 652 259 2ms 10 Dec 2023 532nd Aurel300 🇨🇭 652 266 204ms 21 Jul 2024 533rd msbranicky 650 267 179ms 1 Oct 2023 534th emgordon154 649 172 9ms 13 Jun 2024 535th AbhilashaTandon 649 176 9ms 21 Sep 2023 536th snoozingnewt 🇨🇦 649 196 101ms 31 Oct 2025 537th msbranicky 649 246 274ms 31 Aug 2023 538th stackotter 648 222 522ms 29 May 2023 539th eiburns 646 177 9ms 5 May 2023 540th MeWhenI 🇻🇦 646 187 495ms 1 May 2023 541st billings7 🇬🇧 645 164 366ms 20 May 2024 542nd albanian-laundromat 644 201 41ms 7 Nov 2025 543rd yuchuehw 642 178 9ms 3 Jan 2024 543rd Flekay 🇩🇪 642 178 9ms 11 Jul 2025 545th Sora1248 🇩🇪 640 157 2ms 21 May 2023 546th cbrt-x 639 207 117ms 20 Jan 2025 547th ShiraJoseph 🇺🇸 638 175 9ms 21 Jul 2023 547th r-schmidtke 638 175 9ms 26 Apr 2024 549th mbittner20 638 179 9ms 27 May 2023 549th BREMAUCY 🇫🇷 638 179 9ms 8 Sep 2025 549th Matter1024 🇮🇳 638 179 9ms 15 Nov 2025 552nd postie77 637 166 394ms 11 Jul 2023 553rd greenstuartj 636 110 34ms 24 Jul 2023 554th MeWhenI 🇻🇦 636 120 229ms 1 May 2023 555th jeff-at-tamer-dot-codes 🇺🇸 635 180 9ms 17 May 2023 555th KatieLG-Transpiler 🇬🇧 635 180 10ms 16 Aug 2024 557th MeWhenI 🇻🇦 635 231 1,328ms 1 May 2023 558th Maximizer02 634 209 7ms 10 Jan 2025 559th DialFrost 🇸🇬 633 217 2ms 26 Jan 2024 560th Shanethegamer 🇺🇸 633 274 174ms 17 May 2023 First Prev 481–560 of 830 Next Last