The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
PalindromemordnilaP 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 321st DialFrost 🇸🇬 751 225 453ms 20 Jan 2025 322nd UnderKoen 🇳🇱 750 185 64ms 18 days ago 323rd Shanethegamer 🇺🇸 749 122 6ms 4 Oct 2024 324th error256 748 226 432ms 28 Mar 2025 325th Shanethegamer 🇺🇸 747 70 308ms 5 Sep 2024 325th MarcMush 🇫🇷 747 70 781ms 16 Sep 2024 327th Shanethegamer 🇺🇸 745 95 9ms 1 Sep 2024 328th alemelis 744 78 409ms 1 Sep 2024 328th Shanethegamer 🇺🇸 744 78 426ms 1 Sep 2024 328th SirBogman 🇺🇸 744 78 405ms 4 Sep 2024 328th error256 744 78 490ms 4 Sep 2024 328th commandblockguy 🇺🇸 744 78 399ms 1 Sep 2025 333rd zacjl 743 84 12ms 18 Sep 2024 334th Mikey-Beep 🇬🇧 743 119 397ms 2 Sep 2024 335th stefangimmillaro 739 169 44ms 3 Sep 2024 336th CornerMercury 🇬🇧 735 79 475ms 19 days ago 337th Shanethegamer 🇺🇸 735 105 4ms 1 Sep 2024 338th FlyingPenguin223 734 94 2ms 18 Sep 2024 339th MostParsingVex 734 164 77ms 6 Jan 2025 340th GolfingSuccess 🇬🇷 733 30 54ms 1 Sep 2024 340th MeWhenI 🇻🇦 733 30 67ms 8 Jun 2025 340th CaedenHarper 🇨🇦 733 30 45ms 18 days ago 343rd CaedenHarper 🇨🇦 730 71 748ms 27 Sep 2025 344th dokutan 730 96 6ms 13 Sep 2024 345th targrik 730 97 9ms 8 Feb 2025 345th dokutan 730 97 9ms 15 Jun 2025 347th error256 730 121 377ms 24 Sep 2024 348th albanian-laundromat 728 232 446ms 15 Oct 2025 349th bitsandbeyond 🇳🇱 726 64 281ms 18 days ago 350th MeWhenI 🇻🇦 726 80 440ms 1 Sep 2024 350th GrayJoKing 🇦🇺 726 80 449ms 2 Sep 2024 352nd xsot 🇸🇬 726 86 10ms 1 Sep 2024 352nd Steffan153 🇫🇮 726 86 11ms 1 Sep 2024 352nd SirBogman 🇺🇸 726 86 10ms 2 Sep 2024 352nd stefangimmillaro 726 86 10ms 2 Sep 2024 352nd m-tkach 🇺🇦 726 86 10ms 2 Sep 2024 352nd lynn 726 86 11ms 4 Sep 2024 352nd kops-cg 726 86 10ms 11 Feb 2025 352nd bzijlema 🇳🇱 726 86 10ms 14 May 2025 352nd 5cw 🇺🇸 726 86 10ms 4 Aug 2025 352nd ovs-code 🇩🇪 726 86 10ms 19 days ago 362nd Shanethegamer 🇺🇸 726 95 2ms 2 Sep 2024 363rd emgordon154 725 63 854ms 18 Nov 2024 364th charliegaming 722 98 9ms 7 Sep 2024 365th Shanethegamer 🇺🇸 720 128 377ms 1 Sep 2024 366th dokutan 719 124 3ms 5 Sep 2024 367th GolfingSuccess 🇬🇷 717 87 11ms 1 Sep 2024 367th alemelis 717 87 10ms 1 Sep 2024 367th Shanethegamer 🇺🇸 717 87 10ms 1 Sep 2024 367th cros107 🇦🇺 717 87 14ms 2 Sep 2024 367th inventshah 717 87 11ms 2 Sep 2024 367th annaproxy 717 87 11ms 3 Sep 2024 367th BoBz200 717 87 10ms 20 Sep 2024 367th ehulinsky 🇺🇸 717 87 12ms 3 Apr 2025 367th chartung17 717 87 10ms 7 Apr 2025 367th 40fied4t 717 87 10ms 6 May 2025 367th ryyyn 🇺🇸 717 87 11ms 10 Jun 2025 367th commandblockguy 🇺🇸 717 87 11ms 11 Jul 2025 367th hiichbindermax 717 87 10ms 19 Aug 2025 367th robin-scragg 717 87 10ms 18 Oct 2025 381st Kacarott 🇦🇺 717 132 3ms 4 Sep 2024 382nd anter69 🇭🇺 715 59 72ms 25 Oct 2024 383rd KatieLG 🇬🇧 715 99 9ms 5 Oct 2025 384th snyderek 🇺🇸 712 150 72ms 15 Sep 2024 385th AlephSquirrel 709 88 143ms 1 Sep 2024 385th ahmetdemirag 🇨🇾 709 88 10ms 3 Sep 2024 385th hellwue 709 88 10ms 4 Sep 2024 385th Schreipfelerer 709 88 10ms 11 Sep 2024 385th bob-th 709 88 10ms 17 Sep 2024 385th InigoK 🇺🇸 709 88 10ms 18 Sep 2024 385th moustave 709 88 14ms 24 Oct 2024 385th andrewjc2000 709 88 10ms 10 Mar 2025 393rd emgordon154 708 85 135ms 1 Sep 2024 394th alexsave 708 100 9ms 22 Sep 2024 395th JDiLenarda 🇫🇷 708 170 1,314ms 3 Sep 2024 396th adriweb 🇫🇷 704 98 1ms 4 Sep 2024 396th sean-niemann 🇺🇸 704 98 2ms 5 Sep 2024 396th dokutan 704 98 2ms 14 Sep 2024 399th Shanethegamer 🇺🇸 704 114 102ms 2 Sep 2024 400th ovs-code 🇩🇪 702 128 2ms 1 Sep 2024 First Prev 321–400 of 707 Next Last