The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
PalindromemordnilaP 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 239th didion0 🇺🇸 843 84 9ms 30 May 2025 242nd edsrzf 🇳🇿 843 125 45ms 31 Dec 2024 242nd kg583 🇺🇸 843 125 43ms 25 Mar 2025 244th SirBogman 🇺🇸 841 36 33ms 11 Sep 2024 245th Kacarott 🇦🇺 841 89 68ms 1 Sep 2024 245th error256 841 89 63ms 7 days ago 247th BlankSpruce 841 91 9ms 1 Sep 2024 247th KatieLG 🇬🇧 841 91 10ms 1 Sep 2024 247th ZakkkkAttackkkk 🇵🇭 841 91 10ms 1 Sep 2024 247th BREMAUCY 🇫🇷 841 91 10ms 3 Sep 2024 247th charliegaming 841 91 10ms 7 Sep 2024 247th mbittner20 841 91 10ms 9 Sep 2024 247th neihousaigaai 841 91 9ms 28 Sep 2024 247th Rubiksmath 841 91 11ms 1 Oct 2024 247th lifthrasiir 🇰🇷 841 91 11ms 20 Nov 2024 247th jameswmccarty 841 91 10ms 2 Dec 2024 247th croc54 841 91 11ms 12 Jan 2025 247th Pyroan 841 91 11ms 24 Feb 2025 247th plcc0 841 91 11ms 6 Mar 2025 247th WillowWispy 841 91 11ms 21 Mar 2025 247th keelimeguy 🇺🇸 841 91 10ms 17 May 2025 247th albanian-laundromat 841 91 11ms 5 Jun 2025 247th clayboll99 841 91 11ms 15 Jul 2025 247th blaztoma 🇱🇹 841 91 10ms 21 Sep 2025 247th vhoulbreque 🇫🇷 841 91 10ms 27 days ago 247th FortuiteMan 🇫🇷 841 91 11ms 18 days ago 247th LostSyntax21 🇬🇧 841 91 10ms 18 days ago 247th CaedenHarper 🇨🇦 841 91 30ms 17 days ago 247th Lv0Sys 🇵🇱 841 91 9ms 8 days ago 270th rhdqor213 840 107 2ms 9 days ago 271st AlephSquirrel 839 109 6ms 18 Feb 2025 272nd Shanethegamer 🇺🇸 838 96 98ms 24 May 2025 273rd sean-niemann 🇺🇸 836 74 141ms 4 Aug 2025 274th Shanethegamer 🇺🇸 836 202 1,426ms 1 Mar 2025 275th xnor-gate 834 82 14ms 5 Mar 2025 276th nwellnhof 🇩🇪 833 48 4ms 1 Sep 2024 277th MeWhenI 🇻🇦 832 75 5ms 3 Sep 2024 277th xsot 🇸🇬 832 75 5ms 17 hours ago 279th JayXon 🇺🇸 832 77 74ms 18 Jun 2025 280th dokutan 832 92 10ms 3 Sep 2024 280th fourth-bit 832 92 10ms 4 Sep 2024 280th bnic24 832 92 10ms 5 Sep 2024 283rd nwellnhof 🇩🇪 832 108 2ms 10 Sep 2024 284th JayXon 🇺🇸 831 111 379ms 20 Sep 2024 285th MeWhenI 🇻🇦 830 45 3ms 1 Sep 2024 286th MeWhenI 🇻🇦 830 55 875ms 1 Sep 2024 286th Natanaelel 🇸🇪 830 55 858ms 1 Sep 2024 288th Shanethegamer 🇺🇸 830 145 1,289ms 4 Sep 2024 288th m-tkach 🇺🇦 830 145 81ms 27 Sep 2024 290th MeWhenI 🇻🇦 829 75 4,629ms 24 Oct 2024 290th duckyluuk 🇳🇱 829 75 3,884ms 25 Oct 2024 292nd emgordon154 825 59 10ms 15 Nov 2024 293rd error256 825 146 1,371ms 2 May 2025 294th emplv 🇱🇻 824 159 251ms 18 Sep 2024 295th duckyluuk 🇳🇱 823 86 9ms 1 Sep 2024 296th adamnielson42 🇺🇸 823 93 9ms 7 Oct 2024 296th guilhem-roy 🇫🇷 823 93 14ms 31 May 2025 298th sean-niemann 🇺🇸 823 112 385ms 4 Sep 2024 299th emgordon154 822 77 392ms 22 Nov 2024 300th MeWhenI 🇻🇦 821 98 407ms 2 Sep 2024 301st rak1507 🇬🇧 819 31 3ms 11 Sep 2024 302nd sean-niemann 🇺🇸 819 151 57ms 16 Jan 2025 303rd kg583 🇺🇸 816 112 7ms 9 May 2025 304th canissimia 🇦🇶 816 116 13ms 4 Sep 2024 305th m-tkach 🇺🇦 816 170 666ms 15 Jan 2025 306th rucin93 🇵🇱 814 76 132ms 31 Oct 2024 307th GrayJoKing 🇦🇺 814 84 13ms 1 Sep 2024 307th annaproxy 814 84 17ms 22 Oct 2024 309th mousetail 🇳🇱 814 94 13ms 1 Sep 2024 309th ljweel 814 94 10ms 12 Sep 2024 309th qpwoeirut 814 94 12ms 7 Feb 2025 312th alemelis 812 78 409ms 1 Sep 2024 312th Shanethegamer 🇺🇸 812 78 426ms 1 Sep 2024 312th SirBogman 🇺🇸 812 78 405ms 4 Sep 2024 312th error256 812 78 490ms 4 Sep 2024 312th commandblockguy 🇺🇸 812 78 399ms 1 Sep 2025 312th Babafaba 812 78 409ms 22 Oct 2025 318th edsrzf 🇳🇿 812 99 553ms 17 days ago 319th ovs-code 🇩🇪 811 52 51ms 1 Sep 2024 320th error256 811 99 106ms 4 Sep 2024 First Prev 241–320 of 710 Next Last