The Calendar hole will go live in approximately 32 hours. Why not try and solve it ahead of time?
Card Number Validation 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 241st ovs-code 🇩🇪 802 119 14ms 1 Oct 2024 242nd Kacarott 🇦🇺 801 73 1,111ms 1 Oct 2024 242nd chunes3 🇺🇸 801 73 1,046ms 2 Oct 2024 244th stefangimmillaro 801 89 409ms 4 Oct 2024 245th MeWhenI 🇻🇦 801 127 2ms 5 Oct 2024 245th albanian-laundromat 801 127 3ms 3 Nov 2025 247th Shanethegamer 🇺🇸 801 208 1,488ms 14 Apr 2025 247th DialFrost 🇸🇬 801 208 521ms 18 Apr 2025 249th sean-niemann 🇺🇸 799 92 112ms 1 Oct 2025 250th snoozingnewt 🇨🇦 798 72 334ms 23 days ago 251st Babafaba 798 81 19ms 11 Nov 2025 252nd albanian-laundromat 797 74 765ms 3 Nov 2025 253rd 2bular 796 49 31ms 8 Nov 2025 254th tayloia 🇬🇧 795 81 9ms 3 Oct 2024 254th targrik 795 81 9ms 8 Feb 2025 254th Lv0Sys 🇵🇱 795 81 10ms 20 days ago 257th DialFrost 🇸🇬 795 85 7ms 1 Oct 2024 257th xsot 🇸🇬 795 85 4ms 7 Oct 2024 259th stefangimmillaro 794 87 99ms 4 Oct 2024 260th Shanethegamer 🇺🇸 794 102 384ms 4 Oct 2024 261st Shanethegamer 🇺🇸 794 128 2ms 3 Oct 2024 262nd DialFrost 🇸🇬 793 84 3,150ms 26 Oct 2024 263rd albanian-laundromat 793 120 42ms 3 Nov 2025 264th MeWhenI 🇻🇦 792 90 435ms 2 Oct 2024 265th MeWhenI 🇻🇦 791 109 394ms 2 Oct 2024 266th jared-hughes 791 203 101ms 20 Dec 2024 267th saito-ta 🇯🇵 790 74 7ms 1 Oct 2024 268th emgordon154 789 151 262ms 17 Jan 2025 269th Natanaelel 🇸🇪 788 48 160ms 1 Oct 2024 270th SB-945 788 82 16ms 1 Oct 2024 270th HumanoidCPU 788 82 61ms 7 Mar 2025 270th fkantelberg 788 82 11ms 11 Jul 2025 270th BrunoVisnadi 🇧🇷 788 82 10ms 21 Sep 2025 274th emgordon154 787 164 1,837ms 7 days ago 275th KingSkyrock 🇺🇸 785 82 9ms 14 Oct 2024 276th Shanethegamer 🇺🇸 785 88 99ms 4 Oct 2024 277th kg583 🇺🇸 785 94 4ms 13 Nov 2025 278th SirBogman 🇺🇸 785 138 39ms 11 Jul 2025 279th edsrzf 🇳🇿 784 119 150ms 23 Jul 2025 279th namelessiw 784 119 440ms 9 Oct 2025 281st Shanethegamer 🇺🇸 784 152 264ms 3 Oct 2024 281st targrik 784 152 264ms 7 Jul 2025 283rd stefangimmillaro 783 61 42ms 1 Oct 2024 284th Shanethegamer 🇺🇸 783 91 416ms 3 Oct 2024 285th SirBogman 🇺🇸 780 50 34ms 8 Jul 2025 286th ovs-code 🇩🇪 780 75 1,104ms 1 Oct 2024 287th MeWhenI 🇻🇦 780 122 39ms 5 Oct 2024 288th MeWhenI 🇻🇦 779 88 1ms 2 Oct 2024 289th sean-niemann 🇺🇸 779 107 332ms 3 Oct 2024 290th Bmrl7 778 83 10ms 3 Oct 2024 291st bizy-coder 777 74 461ms 1 Oct 2024 291st m-tkach 🇺🇦 777 74 474ms 3 Oct 2024 293rd Shanethegamer 🇺🇸 777 120 454ms 24 Sep 2025 294th DialFrost 🇸🇬 776 76 745ms 30 Aug 2025 295th adriweb 🇫🇷 776 102 1ms 5 Oct 2024 296th m-tkach 🇺🇦 776 131 3ms 4 Oct 2024 297th uttumuttu 🇫🇮 775 83 9ms 1 Oct 2024 297th KatieLG 🇬🇧 775 83 9ms 1 Oct 2024 297th Larento 775 83 9ms 4 Nov 2024 297th Andrey-Plotnikov 775 83 9ms 13 Jan 2025 297th nathanadams 🇳🇿 775 83 9ms 6 Oct 2025 302nd duckyluuk 🇳🇱 775 97 9ms 25 Nov 2025 303rd Natanaelel 🇸🇪 775 143 145ms 20 Apr 2025 304th sean-niemann 🇺🇸 771 105 440ms 1 Oct 2024 305th DialFrost 🇸🇬 771 121 349ms 24 Sep 2025 306th sisyphus-ppcg 🇦🇺 770 62 36ms 3 Oct 2024 307th retrohun 769 63 20ms 2 Oct 2024 308th edsrzf 🇳🇿 769 76 1,005ms 1 Oct 2024 309th AlephSquirrel 769 84 19ms 1 Oct 2024 309th kops-cg 769 84 19ms 22 Feb 2025 309th xnor-gate 769 84 19ms 23 Feb 2025 309th plcc0 769 84 17ms 6 Apr 2025 309th KatieLG 🇬🇧 769 84 25ms 25 May 2025 314th DialFrost 🇸🇬 769 90 2ms 18 Nov 2025 315th Waffle3z 769 103 2ms 2 Oct 2024 316th targrik 768 88 8ms 7 Feb 2025 317th lifthrasiir 🇰🇷 767 37 2ms 27 Nov 2024 318th didion0 🇺🇸 766 84 9ms 10 Jan 2025 319th DialFrost 🇸🇬 766 131 7ms 11 Dec 2024 320th MeWhenI 🇻🇦 765 109 334ms 2 Oct 2024 First Prev 241–320 of 849 Next Last