The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Evil Numbers in Ruby 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 1st primo-ppcg 🇹🇭 1,000 26 34ms 3 Jan 2020 1st sisyphus-ppcg 🇦🇺 1,000 26 41ms 10 Feb 2021 1st JayXon 🇺🇸 1,000 26 34ms 20 Feb 2021 1st Lydxn 🇨🇦 1,000 26 32ms 17 Aug 2021 1st nwellnhof 🇩🇪 1,000 26 34ms 30 Dec 2021 1st stefangimmillaro 1,000 26 49ms 3 Aug 2023 1st MeWhenI 🇻🇦 1,000 26 33ms 3 Aug 2023 1st radarek 🇵🇱 1,000 26 39ms 16 Dec 2024 1st pardouin 🇫🇷 1,000 26 32ms 11 Apr 2025 10th Steffan153 🇫🇮 963 27 41ms 25 Apr 2023 10th sean-niemann 🇺🇸 963 27 44ms 8 Apr 2025 12th janlelis 929 28 35ms 5 Jan 2020 12th lynn 929 28 32ms 4 Feb 2022 12th OhmNomNom 929 28 36ms 30 Oct 2022 12th Shanethegamer 🇺🇸 929 28 43ms 22 Mar 2023 12th xsot 🇸🇬 929 28 37ms 25 May 2023 12th Natanaelel 🇸🇪 929 28 35ms 14 Mar 2024 12th ovs-code 🇩🇪 929 28 34ms 22 Apr 2024 12th fuzzylojik-golf 🇺🇸 929 28 44ms 29 Aug 2025 20th FlyingPenguin223 839 31 36ms 1 Nov 2024 21st prplz 🇦🇺 813 32 35ms 16 Mar 2020 21st GrayJoKing 🇦🇺 813 32 44ms 25 Jan 2021 21st emgordon154 813 32 53ms 21 Sep 2024 24th jaredcrystal 🇺🇸 788 33 35ms 10 Dec 2018 24th yzhs 🇩🇪 788 33 35ms 8 Sep 2020 24th Waffle3z 788 33 37ms 11 Jan 2021 24th razetime 788 33 37ms 25 Jan 2021 24th rak1507 🇬🇧 788 33 36ms 25 Jan 2021 24th rbviz 788 33 34ms 29 Mar 2021 24th 4hg 🇺🇸 788 33 36ms 6 Jul 2022 24th m-tkach 🇺🇦 788 33 34ms 9 May 2023 24th CaedenHarper 🇨🇦 788 33 33ms 28 Aug 2025 24th blaztoma 🇱🇹 788 33 43ms 13 Nov 2025 34th j55d 765 34 35ms 3 Dec 2017 34th SirBogman 🇺🇸 765 34 47ms 14 Feb 2020 34th janbehrens 🇩🇪 765 34 34ms 24 Mar 2021 34th hugolgst 765 34 42ms 4 Jun 2021 34th anter69 🇭🇺 765 34 38ms 27 Jun 2021 34th Marin-Kitagawa 765 34 32ms 18 Jul 2021 34th olivermrose 🇺🇸 765 34 42ms 27 Aug 2021 34th o0lit3 🇺🇸 765 34 56ms 11 Sep 2021 34th UladzimirSukharukau 765 34 35ms 13 Sep 2021 34th KatieLG 🇬🇧 765 34 35ms 1 Oct 2021 34th akshatj27 🇦🇶 765 34 38ms 11 Jan 2022 34th Irratix 🇳🇱 765 34 35ms 4 Mar 2022 34th orthoplex 🇨🇽 765 34 40ms 1 Apr 2022 34th Mortis66666 765 34 34ms 14 Jul 2022 34th jared-hughes 765 34 35ms 9 Sep 2022 34th Andriamanitra 🇫🇮 765 34 47ms 22 Sep 2022 34th DialFrost 🇸🇬 765 34 40ms 29 Jan 2023 34th Yewzir 🇧🇪 765 34 35ms 17 Nov 2023 34th dokutan 765 34 33ms 17 Jul 2025 53rd hrrs01 743 35 35ms 14 Mar 2020 53rd proton 🇩🇪 743 35 34ms 9 Jun 2020 53rd hiddicop 🇸🇪 743 35 35ms 29 Jan 2021 53rd liemvo 🇻🇳 743 35 32ms 16 Apr 2021 53rd ls-samer-abuthaher 743 35 32ms 7 Oct 2022 53rd muraterogl 🇹🇷 743 35 35ms 31 Dec 2022 53rd beirigo 🇧🇷 743 35 44ms 27 days ago 60th vonagam 722 36 41ms 8 Nov 2017 60th sk- 722 36 36ms 12 Sep 2019 60th gilufin 722 36 40ms 23 May 2021 60th daninnm 722 36 38ms 23 Jul 2021 60th jbbarth 🇫🇷 722 36 35ms 21 Aug 2021 60th annaproxy 722 36 39ms 24 Aug 2022 66th jimworm 703 37 32ms 8 Nov 2017 66th acornellier 703 37 45ms 1 Dec 2021 66th pilaf 🇦🇷 703 37 34ms 14 Apr 2022 66th Haksell 🇦🇶 703 37 35ms 22 Feb 2023 66th rniii 703 37 35ms 21 Aug 2023 66th aaronze 🇦🇺 703 37 37ms 17 Sep 2023 66th olleicua 🇺🇸 703 37 35ms 27 Dec 2023 66th Lv0Sys 🇵🇱 703 37 56ms 20 days ago 74th graft 684 38 36ms 11 Mar 2018 74th nexaitch 684 38 35ms 7 Jul 2020 74th galloj 🇨🇿 684 38 36ms 14 Sep 2022 74th RuyiLi 684 38 35ms 7 Apr 2023 74th tatzyr 🇯🇵 684 38 49ms 8 Jan 2025 74th ejini6969 684 38 44ms 13 Jun 2025 80th n1LS 667 39 34ms 2 Oct 2019 1–80 of 184 Next Last