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 161st ashtraypettingzoo 🇺🇸 875 29 3ms 1 Sep 2024 161st GolfingSuccess 🇬🇷 875 29 3ms 25 Mar 2025 163rd GolfingSuccess 🇬🇷 875 48 6ms 13 Dec 2024 163rd MeWhenI 🇻🇦 875 48 6ms 31 Dec 2024 165th emplv 🇱🇻 874 81 9ms 16 Sep 2024 165th vlpx 🇫🇮 874 81 9ms 23 Sep 2024 165th lukegustafson 🇺🇸 874 81 9ms 26 May 2025 168th JayXon 🇺🇸 874 91 103ms 10 Sep 2024 169th JayXon 🇺🇸 873 137 211ms 10 Jul 2025 169th acotis 873 137 225ms 24 Sep 2025 171st AdrienHache 🇫🇷 872 56 52ms 15 days ago 172nd alemelis 872 60 309ms 1 Sep 2024 172nd antimon2 🇯🇵 872 60 400ms 23 Oct 2024 174th pardouin 🇫🇷 872 71 126ms 17 Apr 2025 175th error256 872 87 6ms 16 Apr 2025 175th edsrzf 🇳🇿 872 87 6ms 17 days ago 177th AlephSquirrel 869 88 143ms 1 Sep 2024 177th ahmetdemirag 🇨🇾 869 88 10ms 3 Sep 2024 177th anter69 🇭🇺 869 88 10ms 3 Sep 2024 177th hellwue 869 88 10ms 4 Sep 2024 177th Schreipfelerer 869 88 10ms 11 Sep 2024 177th abhishekg999 869 88 10ms 17 Sep 2024 177th bob-th 869 88 10ms 17 Sep 2024 177th InigoK 🇺🇸 869 88 10ms 18 Sep 2024 177th moustave 869 88 14ms 24 Oct 2024 177th andrewjc2000 869 88 10ms 10 Mar 2025 187th JayXon 🇺🇸 868 151 251ms 10 Sep 2024 187th nwellnhof 🇩🇪 868 151 251ms 10 Sep 2024 187th 0xjac 🇨🇭 868 151 260ms 22 days ago 190th error256 866 74 79ms 6 Sep 2024 191st Frowny 865 35 33ms 1 Sep 2024 191st Natanaelel 🇸🇪 865 35 32ms 1 Sep 2024 191st 4hg 🇺🇸 865 35 33ms 5 Sep 2024 194th error256 865 93 532ms 24 Jul 2025 195th error256 864 72 3,794ms 24 Oct 2024 196th sean-niemann 🇺🇸 863 62 696ms 22 Sep 2025 197th voytxt 🇨🇿 863 82 9ms 1 Sep 2024 197th dmrichwa 🇺🇸 863 82 9ms 2 Sep 2024 199th JayXon 🇺🇸 862 53 840ms 2 Sep 2024 199th pardouin 🇫🇷 862 53 878ms 4 Sep 2025 201st sean-niemann 🇺🇸 862 88 7ms 16 Aug 2025 202nd error256 862 112 453ms 24 Sep 2025 202nd sean-niemann 🇺🇸 862 112 490ms 24 Sep 2025 202nd MeWhenI 🇻🇦 862 112 453ms 7 Nov 2025 205th GrayJoKing 🇦🇺 861 57 6ms 20 Mar 2025 206th OllieBoyne 🇬🇧 860 89 10ms 9 Sep 2024 206th davecame 860 89 11ms 17 Sep 2024 206th Bmrl7 860 89 9ms 3 Oct 2024 206th DialFrost 🇸🇬 860 89 10ms 21 Nov 2024 206th CommandLeo 🇮🇹 860 89 10ms 21 days ago 206th KasperKivimaeki 🇫🇮 860 89 10ms 17 days ago 212th kumavale 860 139 223ms 28 Oct 2025 213th xsot 🇸🇬 859 66 15ms 10 Jul 2025 214th edsrzf 🇳🇿 859 84 100ms 17 days ago 215th MeWhenI 🇻🇦 858 59 21ms 13 Jun 2025 216th duckyluuk 🇳🇱 857 49 5ms 21 days ago 217th ovs-code 🇩🇪 857 61 313ms 1 Sep 2024 218th lyphyser 856 57 49ms 5 Jan 2025 219th duckyluuk 🇳🇱 856 74 554ms 1 Sep 2024 220th JayXon 🇺🇸 856 94 530ms 23 Jul 2025 221st KasperKivimaeki 🇫🇮 856 105 2ms 17 Aug 2025 222nd MeWhenI 🇻🇦 854 57 8ms 1 Sep 2024 223rd JayXon 🇺🇸 854 94 103ms 10 Sep 2024 224th DialFrost 🇸🇬 854 103 172ms 21 Nov 2024 225th edsrzf 🇳🇿 854 107 6ms 19 Oct 2025 226th tayloia 🇬🇧 853 83 9ms 1 Sep 2024 226th Lv0Sys 🇵🇱 853 83 10ms 8 days ago 228th JayXon 🇺🇸 851 87 2ms 20 Sep 2024 229th firegene 🇮🇪 850 90 10ms 3 Sep 2024 229th snoozingnewt 🇨🇦 850 90 11ms 25 days ago 231st JayXon 🇺🇸 849 105 3ms 17 Nov 2025 232nd error256 846 94 108ms 1 Sep 2024 233rd ovs-code 🇩🇪 846 95 89ms 1 Sep 2024 233rd JayXon 🇺🇸 846 95 99ms 24 May 2025 235th CLOStrophobic 🇮🇹 846 108 6ms 19 Feb 2025 236th edsrzf 🇳🇿 844 99 4ms 9 Jan 2025 236th retrohun 844 99 506ms 8 days ago 238th sean-niemann 🇺🇸 843 74 5ms 19 Dec 2024 239th GrayJoKing 🇦🇺 843 84 9ms 2 Sep 2024 239th uttumuttu 🇫🇮 843 84 9ms 30 Sep 2024 First Prev 161–240 of 710 Next Last