The Calendar hole will go live in approximately 11 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 321st edsrzf 🇳🇿 812 99 553ms 19 days ago 322nd ovs-code 🇩🇪 811 52 51ms 1 Sep 2024 323rd error256 811 99 106ms 4 Sep 2024 324th tomtheisen 🇺🇸 811 109 424ms 8 Nov 2024 325th error256 810 77 5ms 1 Sep 2024 326th MostParsingVex 809 153 51ms 3 Oct 2024 327th primo-ppcg 🇹🇭 809 232 145ms 19 days ago 328th JayXon 🇺🇸 808 243 1,894ms 10 Jul 2025 329th SirBogman 🇺🇸 806 155 45ms 3 Sep 2024 330th msbranicky 805 95 11ms 1 Sep 2024 330th Bulmenisaurus 805 95 12ms 4 Sep 2024 330th btjones0 805 95 10ms 13 Sep 2024 330th jfallon1997 805 95 10ms 26 Sep 2024 330th jacekwladzinski 805 95 10ms 7 Oct 2025 330th aalec 805 95 10ms 8 Nov 2025 336th GolfingSuccess 🇬🇷 805 210 471ms 8 Feb 2025 337th RyanMHsiao 804 244 1,930ms 25 Sep 2024 338th error256 803 150 57ms 5 May 2025 339th CornerMercury 🇬🇧 802 79 475ms 19 days ago 340th ovs-code 🇩🇪 802 175 9ms 30 Sep 2024 341st m-tkach 🇺🇦 802 177 27ms 27 Sep 2024 342nd emgordon154 801 211 429ms 24 Jan 2025 343rd MeWhenI 🇻🇦 799 50 3ms 1 Sep 2024 343rd retrohun 799 50 3ms 9 Mar 2025 345th albanian-laundromat 798 202 4ms 44 hours ago 346th fgrosshans 🇫🇷 797 96 10ms 1 Sep 2024 346th Mikey-Beep 🇬🇧 797 96 10ms 2 Sep 2024 346th JudeTyrrell 797 96 10ms 22 Sep 2024 349th nwellnhof 🇩🇪 797 134 566ms 2 Sep 2024 349th tailorspy 797 134 631ms 16 Sep 2024 351st namelessiw 796 111 405ms 22 Apr 2025 352nd MeWhenI 🇻🇦 795 101 105ms 3 Sep 2024 353rd lifthrasiir 🇰🇷 793 32 2ms 29 Nov 2024 354th MeWhenI 🇻🇦 792 80 440ms 1 Sep 2024 354th GrayJoKing 🇦🇺 792 80 449ms 2 Sep 2024 356th o0BlackDragon0o 789 97 13ms 8 Sep 2024 356th Bombalech 789 97 10ms 8 Sep 2024 356th scpchicken 🇵🇼 789 97 248ms 8 Sep 2024 356th Carlettos1 789 97 12ms 14 Sep 2024 360th stefangimmillaro 789 166 254ms 4 Sep 2024 361st mousetail 🇳🇱 785 62 66ms 3 Sep 2024 361st GolfingSuccess 🇬🇷 785 62 12ms 18 days ago 363rd MeWhenI 🇻🇦 785 157 15ms 7 Sep 2024 364th emplv 🇱🇻 783 79 133ms 1 Nov 2024 365th sean-niemann 🇺🇸 782 113 415ms 5 Sep 2024 366th albanian-laundromat 782 114 3ms 23 days ago 367th HumanoidCPU 781 98 12ms 2 Sep 2024 367th dtbao20 🇻🇳 781 98 16ms 30 Sep 2024 367th YAJUE114514 781 98 10ms 30 Jul 2025 367th luuumine 🇫🇷 781 98 10ms 15 Oct 2025 371st rzv-me 780 80 6ms 5 Oct 2024 372nd KingSkyrock 🇺🇸 778 91 9ms 14 Oct 2024 373rd MeWhenI 🇻🇦 777 39 33ms 2 Sep 2024 374th stefangimmillaro 775 114 392ms 4 Sep 2024 375th the-zammers 774 114 117ms 1 Dec 2024 376th jatloe 773 99 11ms 4 Sep 2024 376th alexeldridge 773 99 10ms 14 Sep 2024 376th Just4FunCoder 773 99 10ms 14 Sep 2025 376th 0xjac 🇨🇭 773 99 10ms 26 days ago 380th dokutan 773 104 124ms 1 Sep 2024 381st snoozingnewt 🇨🇦 772 82 433ms 22 Nov 2025 382nd error256 769 139 573ms 24 Sep 2024 383rd emgordon154 767 156 350ms 4 Mar 2025 384th Kacarott 🇦🇺 765 100 10ms 3 Sep 2024 384th Artemis21 🇬🇧 765 100 11ms 4 Jan 2025 386th CatsAreFluffy 763 64 53ms 4 Nov 2024 387th dokutan 763 83 480ms 3 Sep 2024 387th lifthrasiir 🇰🇷 763 83 429ms 2 Dec 2024 387th albanian-laundromat 763 83 453ms 4 Aug 2025 387th CaedenHarper 🇨🇦 763 83 487ms 9 Aug 2025 391st error256 760 116 122ms 2 Sep 2024 392nd madex 🇩🇪 757 101 14ms 1 Sep 2024 392nd RedzGoose 🇦🇺 757 101 10ms 15 Oct 2024 392nd JunkIce 757 101 11ms 25 Oct 2024 392nd Flekay 🇩🇪 757 101 11ms 10 Jul 2025 396th kg583 🇺🇸 757 102 5ms 37 hours ago 397th sean-niemann 🇺🇸 755 118 3ms 16 Jan 2025 398th albanian-laundromat 754 69 741ms 12 Sep 2025 399th Shanethegamer 🇺🇸 754 117 119ms 1 Sep 2024 400th stefangimmillaro 753 94 9ms 4 Sep 2024 First Prev 321–400 of 713 Next Last