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 160th GolfingSuccess 🇬🇷 875 29 3ms 25 Mar 2025 162nd GolfingSuccess 🇬🇷 875 48 6ms 13 Dec 2024 162nd MeWhenI 🇻🇦 875 48 6ms 31 Dec 2024 164th emplv 🇱🇻 874 81 9ms 16 Sep 2024 164th vlpx 🇫🇮 874 81 9ms 23 Sep 2024 164th lukegustafson 🇺🇸 874 81 9ms 26 May 2025 167th JayXon 🇺🇸 874 91 103ms 10 Sep 2024 168th JayXon 🇺🇸 873 137 211ms 10 Jul 2025 168th acotis 873 137 225ms 24 Sep 2025 170th AdrienHache 🇫🇷 872 56 52ms 15 days ago 171st alemelis 872 60 309ms 1 Sep 2024 171st antimon2 🇯🇵 872 60 400ms 23 Oct 2024 173rd pardouin 🇫🇷 872 71 126ms 17 Apr 2025 174th error256 872 87 6ms 16 Apr 2025 174th edsrzf 🇳🇿 872 87 6ms 17 days ago 176th AlephSquirrel 869 88 143ms 1 Sep 2024 176th ahmetdemirag 🇨🇾 869 88 10ms 3 Sep 2024 176th anter69 🇭🇺 869 88 10ms 3 Sep 2024 176th hellwue 869 88 10ms 4 Sep 2024 176th Schreipfelerer 869 88 10ms 11 Sep 2024 176th abhishekg999 869 88 10ms 17 Sep 2024 176th bob-th 869 88 10ms 17 Sep 2024 176th InigoK 🇺🇸 869 88 10ms 18 Sep 2024 176th moustave 869 88 14ms 24 Oct 2024 176th andrewjc2000 869 88 10ms 10 Mar 2025 186th JayXon 🇺🇸 868 151 251ms 10 Sep 2024 186th nwellnhof 🇩🇪 868 151 251ms 10 Sep 2024 186th 0xjac 🇨🇭 868 151 260ms 23 days ago 189th error256 866 74 79ms 6 Sep 2024 190th Frowny 865 35 33ms 1 Sep 2024 190th Natanaelel 🇸🇪 865 35 32ms 1 Sep 2024 190th 4hg 🇺🇸 865 35 33ms 5 Sep 2024 193rd error256 865 93 532ms 24 Jul 2025 194th error256 864 72 3,794ms 24 Oct 2024 195th DialFrost 🇸🇬 863 61 729ms 31 Aug 2025 196th voytxt 🇨🇿 863 82 9ms 1 Sep 2024 196th dmrichwa 🇺🇸 863 82 9ms 2 Sep 2024 198th JayXon 🇺🇸 862 53 840ms 2 Sep 2024 198th pardouin 🇫🇷 862 53 878ms 4 Sep 2025 200th sean-niemann 🇺🇸 862 88 7ms 16 Aug 2025 201st error256 862 112 453ms 24 Sep 2025 201st sean-niemann 🇺🇸 862 112 490ms 24 Sep 2025 201st MeWhenI 🇻🇦 862 112 453ms 7 Nov 2025 204th GrayJoKing 🇦🇺 861 57 6ms 20 Mar 2025 205th OllieBoyne 🇬🇧 860 89 10ms 9 Sep 2024 205th davecame 860 89 11ms 17 Sep 2024 205th Bmrl7 860 89 9ms 3 Oct 2024 205th DialFrost 🇸🇬 860 89 10ms 21 Nov 2024 205th CommandLeo 🇮🇹 860 89 10ms 21 days ago 205th KasperKivimaeki 🇫🇮 860 89 10ms 18 days ago 211th kumavale 860 139 223ms 28 Oct 2025 212th xsot 🇸🇬 859 66 15ms 10 Jul 2025 213th edsrzf 🇳🇿 859 84 100ms 17 days ago 214th MeWhenI 🇻🇦 858 59 21ms 13 Jun 2025 215th duckyluuk 🇳🇱 857 49 5ms 22 days ago 216th ovs-code 🇩🇪 857 61 313ms 1 Sep 2024 217th lyphyser 856 57 49ms 5 Jan 2025 218th duckyluuk 🇳🇱 856 74 554ms 1 Sep 2024 219th JayXon 🇺🇸 856 94 530ms 23 Jul 2025 220th KasperKivimaeki 🇫🇮 856 105 2ms 17 Aug 2025 221st MeWhenI 🇻🇦 854 57 8ms 1 Sep 2024 222nd JayXon 🇺🇸 854 94 103ms 10 Sep 2024 223rd DialFrost 🇸🇬 854 103 172ms 21 Nov 2024 224th edsrzf 🇳🇿 854 107 6ms 19 Oct 2025 225th tayloia 🇬🇧 853 83 9ms 1 Sep 2024 225th Lv0Sys 🇵🇱 853 83 10ms 8 days ago 227th JayXon 🇺🇸 851 87 2ms 20 Sep 2024 228th firegene 🇮🇪 850 90 10ms 3 Sep 2024 228th snoozingnewt 🇨🇦 850 90 11ms 26 days ago 230th sean-niemann 🇺🇸 849 62 696ms 22 Sep 2025 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 9 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