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 78th Natanaelel 🇸🇪 897 47 50ms 24 Jan 2025 82nd JayXon 🇺🇸 897 69 136ms 31 Oct 2024 83rd JayXon 🇺🇸 896 77 2ms 9 Jan 2025 83rd GrayJoKing 🇦🇺 896 77 2ms 12 Jul 2025 83rd edsrzf 🇳🇿 896 77 2ms 17 days ago 86th pardouin 🇫🇷 895 41 181ms 7 Jan 2025 87th GrayJoKing 🇦🇺 894 47 6ms 23 days ago 88th nwellnhof 🇩🇪 894 52 261ms 1 Sep 2024 89th JayXon 🇺🇸 893 99 414ms 11 Jul 2025 89th AdrienHache 🇫🇷 893 99 432ms 17 Sep 2025 89th Yax42 🇫🇷 893 99 402ms 8 Oct 2025 92nd edsrzf 🇳🇿 892 59 957ms 2 hours ago 93rd emplv 🇱🇻 891 70 6ms 17 Sep 2024 94th xsot 🇸🇬 890 86 10ms 1 Sep 2024 94th Steffan153 🇫🇮 890 86 11ms 1 Sep 2024 94th SB-945 890 86 11ms 1 Sep 2024 94th SirBogman 🇺🇸 890 86 10ms 2 Sep 2024 94th stefangimmillaro 890 86 10ms 2 Sep 2024 94th m-tkach 🇺🇦 890 86 10ms 2 Sep 2024 94th lynn 890 86 11ms 4 Sep 2024 94th emgordon154 890 86 10ms 22 Nov 2024 94th kops-cg 890 86 10ms 11 Feb 2025 94th bzijlema 🇳🇱 890 86 10ms 14 May 2025 94th 5cw 🇺🇸 890 86 10ms 4 Aug 2025 94th ovs-code 🇩🇪 890 86 10ms 18 days ago 94th hallvabo 🇳🇴 890 86 11ms 16 days ago 94th Mukundan314 890 86 11ms 16 days ago 108th JayXon 🇺🇸 890 101 2ms 18 Sep 2024 109th emgordon154 889 70 4,640ms 8 Nov 2024 110th pardouin 🇫🇷 889 99 118ms 1 Sep 2024 110th Natanaelel 🇸🇪 889 99 116ms 1 Sep 2024 110th ovs-code 🇩🇪 889 99 120ms 1 Sep 2024 110th sean-niemann 🇺🇸 889 99 119ms 4 Sep 2024 110th JayXon 🇺🇸 889 99 117ms 6 Sep 2024 110th lynn 889 99 119ms 8 Jan 2025 110th xnor-gate 889 99 119ms 4 Mar 2025 110th Sakisan 🇧🇪 889 99 115ms 22 Apr 2025 110th tobeannouncd 889 99 133ms 25 Apr 2025 110th HPWiz 🇳🇿 889 99 117ms 27 Sep 2025 120th pardouin 🇫🇷 886 59 362ms 2 Sep 2024 120th HPWiz 🇳🇿 886 59 292ms 12 days ago 122nd nwellnhof 🇩🇪 886 109 472ms 25 Sep 2025 122nd JayXon 🇺🇸 886 109 464ms 25 Sep 2025 124th btnlq 885 55 6ms 1 Sep 2024 124th ovs-code 🇩🇪 885 55 15ms 20 Oct 2024 124th sean-niemann 🇺🇸 885 55 7ms 29 Dec 2024 127th Natanaelel 🇸🇪 885 80 9ms 1 Sep 2024 127th MeWhenI 🇻🇦 885 80 8ms 1 Sep 2024 127th helbling 🇨🇭 885 80 9ms 11 Jul 2025 130th nwellnhof 🇩🇪 884 100 421ms 22 Jul 2025 131st ovs-code 🇩🇪 880 25 50ms 1 Sep 2024 132nd sean-niemann 🇺🇸 880 72 484ms 12 days ago 133rd GrayJoKing 🇦🇺 879 60 12ms 3 Sep 2024 133rd error256 879 60 12ms 3 Sep 2024 133rd edsrzf 🇳🇿 879 60 12ms 17 days ago 136th GolfingSuccess 🇬🇷 879 87 11ms 1 Sep 2024 136th kg583 🇺🇸 879 87 14ms 1 Sep 2024 136th alemelis 879 87 10ms 1 Sep 2024 136th Shanethegamer 🇺🇸 879 87 10ms 1 Sep 2024 136th zbreit 🇺🇸 879 87 10ms 1 Sep 2024 136th cros107 🇦🇺 879 87 14ms 2 Sep 2024 136th inventshah 879 87 11ms 2 Sep 2024 136th annaproxy 879 87 11ms 3 Sep 2024 136th starfihs 879 87 10ms 6 Sep 2024 136th BoBz200 879 87 10ms 20 Sep 2024 136th ehulinsky 🇺🇸 879 87 12ms 3 Apr 2025 136th chartung17 879 87 10ms 7 Apr 2025 136th 40fied4t 879 87 10ms 6 May 2025 136th ryyyn 🇺🇸 879 87 11ms 10 Jun 2025 136th commandblockguy 🇺🇸 879 87 11ms 11 Jul 2025 136th hiichbindermax 879 87 10ms 19 Aug 2025 136th Babafaba 879 87 10ms 22 Oct 2025 153rd radarek 🇵🇱 878 52 864ms 10 Sep 2024 154th xsot 🇸🇬 878 60 886ms 18 hours ago 155th IanUtley 877 78 14ms 1 Sep 2024 155th kops-cg 877 78 14ms 6 Mar 2025 157th JayXon 🇺🇸 876 71 3,940ms 8 Nov 2024 157th pardouin 🇫🇷 876 71 4,777ms 17 Nov 2024 159th JayXon 🇺🇸 876 122 534ms 18 Sep 2024 160th ashtraypettingzoo 🇺🇸 875 29 3ms 1 Sep 2024 First Prev 81–160 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