The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
All holes in Ruby 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 Holes Points Bytes Submitted 479th lilyyy411 1 735 34 10 Sep 2021 479th MichaelMBradley 🇨🇦 1 735 34 21 Mar 2022 479th oceko 1 735 34 26 Nov 2022 479th nstearns96 🇬🇧 1 735 34 15 Dec 2022 479th CheeseCake628 🇳🇴 1 735 34 15 Feb 2023 479th hellopatrick 1 735 34 26 Dec 2023 479th Andrey2001 1 735 34 27 days ago 488th aliakseikalosha 1 735 68 22 Apr 2022 489th gabe-gallegos 1 731 52 15 May 2024 490th bstrautin 1 727 77 12 Jun 2020 491st dunghopper 1 726 106 26 Oct 2023 492nd rholliday 2 726 283 2 Mar 2021 493rd McTano 1 725 69 17 Nov 2020 493rd peculiarination 1 725 69 3 May 2021 495th dvargas46 🇺🇸 1 723 119 26 Mar 2022 496th TheAristos 5 716 4,142 11 Dec 2019 497th cefqrn 1 714 35 26 May 2024 498th croc54 1 714 49 10 Dec 2024 499th lux9 1 714 70 5 Oct 2020 499th No-Jons 1 714 70 27 Oct 2020 499th Xyberista 1 714 70 29 Mar 2021 499th dylanarmstrong 1 714 70 18 Dec 2023 499th TheDrawingCoder-Gamer 1 714 70 2 Jul 2025 504th yrral86 1 710 62 9 Mar 2018 504th drkameleon 🇪🇸 1 710 62 28 Jan 2020 506th volpi-m 🇫🇷 2 709 2,466 19 Mar 2024 507th RaBa21 🇭🇺 2 708 1,787 19 Jul 2025 508th germania 1 704 71 4 Jan 2020 508th c99zealot 1 704 71 1 Aug 2020 508th SpeedyNinja 1 704 71 20 Oct 2020 508th techeverri 1 704 71 21 Apr 2022 508th DxSper 1 704 71 16 Feb 2024 513th vrnprkh 1 700 70 30 Mar 2023 514th olliebaum 1 698 63 12 Jul 2018 515th amazingalek 1 694 72 4 days ago 516th rambox11 2 694 125 30 Jan 2019 517th roguh 🇬🇹 1 688 48 14 Jan 2024 518th rachelambda 1 685 73 7 Jun 2020 518th mwarvik 1 685 73 6 days ago 520th DragonaireM 1 677 62 6 Feb 2023 520th arctouch-cristiannevianna 1 677 62 20 Oct 2023 520th trinityy-7 1 677 62 29 Jul 2025 523rd ted 1 677 65 17 Apr 2018 524th 5quiwyrm 1 676 37 31 Aug 2022 525th aglahir1 1 676 74 5 Nov 2021 526th joshuaballoch 1 675 292 15 Jan 2020 527th gfund 1 674 46 5 Oct 2022 528th dymowski 2 671 1,078 15 Jul 2019 529th DmitryArtyomov 1 667 75 25 Apr 2020 530th MichalMarsalek 🇨🇿 2 667 1,048 2 Sep 2022 531st murcielago09z 1 660 50 11 Aug 2025 532nd Pyroan 1 658 38 5 days ago 533rd MichaelWarnecke 1 658 76 27 Apr 2020 533rd Cobrabb 1 658 76 7 Oct 2021 535th 0dyse 1 656 61 6 May 2025 536th polyrtm 1 644 45 29 Mar 2023 537th angetheo 1 641 39 19 Jan 2018 537th okkun-oreo 1 641 39 2 Nov 2020 537th TheRealOhead 🇺🇸 1 641 39 24 Nov 2022 537th Maximizer02 1 641 39 17 Sep 2025 541st martynas-sm 1 641 78 13 Apr 2021 542nd llwwns 1 636 143 1 May 2023 543rd th1rt3en 1 633 49 13 May 2018 544th dCSeven 1 629 70 21 Mar 2019 545th Heathcorp 🇦🇺 1 625 40 26 Nov 2022 546th Shirish111 1 625 80 12 Sep 2019 546th torokmark 1 625 80 17 Nov 2019 546th javmorin 1 625 80 17 May 2020 546th CodeF53 1 625 80 6 Mar 2025 550th Zach1031 2 624 354 15 Nov 2025 551st ptarjan 1 620 71 25 Mar 2018 551st alabhyajindal 1 620 71 3 Apr 2025 553rd anna328p 1 617 81 22 Feb 2019 553rd elisherer 🇮🇱 1 617 81 3 Apr 2019 555th SpareManiKatti 3 611 2,163 19 Apr 2022 556th jacobmichaelis 1 610 82 27 May 2022 556th TEdFlow18 1 610 82 2 Jan 2023 558th domgetter 1 608 51 10 Jun 2020 559th nico-bachner 2 605 2,434 28 Dec 2020 560th trist224 🇫🇷 3 603 397 30 Nov 2022 First Prev 481–560 of 810 Next Last