The Calendar hole will go live in approximately 8 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 316th Babafaba 812 78 409ms 22 Oct 2025 322nd edsrzf 🇳🇿 812 99 553ms 22 days ago 323rd ovs-code 🇩🇪 811 52 51ms 1 Sep 2024 324th error256 811 99 106ms 4 Sep 2024 325th tomtheisen 🇺🇸 811 109 424ms 8 Nov 2024 326th error256 810 77 7ms 1 Sep 2024 327th MostParsingVex 809 153 51ms 3 Oct 2024 328th primo-ppcg 🇹🇭 809 232 145ms 22 days ago 329th JayXon 🇺🇸 808 243 1,894ms 10 Jul 2025 330th SirBogman 🇺🇸 806 155 45ms 3 Sep 2024 331st msbranicky 805 95 11ms 1 Sep 2024 331st Bulmenisaurus 805 95 12ms 4 Sep 2024 331st btjones0 805 95 10ms 13 Sep 2024 331st jfallon1997 805 95 10ms 26 Sep 2024 331st jacekwladzinski 805 95 10ms 7 Oct 2025 331st aalec 805 95 10ms 8 Nov 2025 337th GolfingSuccess 🇬🇷 805 210 471ms 8 Feb 2025 338th RyanMHsiao 804 244 1,930ms 25 Sep 2024 339th error256 803 150 57ms 5 May 2025 340th CornerMercury 🇬🇧 802 79 475ms 22 days ago 341st ovs-code 🇩🇪 802 175 9ms 30 Sep 2024 342nd m-tkach 🇺🇦 802 177 27ms 27 Sep 2024 343rd emgordon154 801 211 429ms 24 Jan 2025 344th MeWhenI 🇻🇦 799 50 3ms 1 Sep 2024 344th retrohun 799 50 3ms 9 Mar 2025 346th albanian-laundromat 798 202 4ms 4 days ago 347th fgrosshans 🇫🇷 797 96 10ms 1 Sep 2024 347th Mikey-Beep 🇬🇧 797 96 10ms 2 Sep 2024 347th JudeTyrrell 797 96 10ms 22 Sep 2024 350th nwellnhof 🇩🇪 797 134 566ms 2 Sep 2024 350th tailorspy 797 134 631ms 16 Sep 2024 352nd namelessiw 796 111 405ms 22 Apr 2025 353rd MeWhenI 🇻🇦 795 101 105ms 3 Sep 2024 354th lifthrasiir 🇰🇷 793 32 2ms 29 Nov 2024 355th MeWhenI 🇻🇦 792 80 440ms 1 Sep 2024 355th GrayJoKing 🇦🇺 792 80 449ms 2 Sep 2024 357th o0BlackDragon0o 789 97 13ms 8 Sep 2024 357th Bombalech 789 97 10ms 8 Sep 2024 357th scpchicken 🇵🇼 789 97 248ms 8 Sep 2024 357th Carlettos1 789 97 12ms 14 Sep 2024 361st stefangimmillaro 789 166 254ms 4 Sep 2024 362nd mousetail 🇳🇱 787 62 66ms 3 Sep 2024 362nd GolfingSuccess 🇬🇷 787 62 12ms 21 days ago 364th MeWhenI 🇻🇦 785 157 15ms 7 Sep 2024 365th emplv 🇱🇻 783 79 133ms 1 Nov 2024 366th sean-niemann 🇺🇸 782 113 415ms 5 Sep 2024 367th albanian-laundromat 782 114 3ms 26 days ago 368th HumanoidCPU 781 98 12ms 2 Sep 2024 368th dtbao20 🇻🇳 781 98 16ms 30 Sep 2024 368th YAJUE114514 781 98 10ms 30 Jul 2025 368th luuumine 🇫🇷 781 98 10ms 15 Oct 2025 372nd rzv-me 780 80 8ms 5 Oct 2024 373rd KingSkyrock 🇺🇸 778 91 9ms 14 Oct 2024 374th MeWhenI 🇻🇦 777 39 33ms 2 Sep 2024 375th stefangimmillaro 775 114 392ms 4 Sep 2024 376th the-zammers 774 114 117ms 1 Dec 2024 377th jatloe 773 99 11ms 4 Sep 2024 377th alexeldridge 773 99 10ms 14 Sep 2024 377th Just4FunCoder 773 99 10ms 14 Sep 2025 377th 0xjac 🇨🇭 773 99 10ms 24 Nov 2025 381st dokutan 773 104 124ms 1 Sep 2024 382nd snoozingnewt 🇨🇦 772 82 433ms 22 Nov 2025 383rd error256 769 139 573ms 24 Sep 2024 384th emgordon154 767 156 350ms 4 Mar 2025 385th Kacarott 🇦🇺 765 100 10ms 3 Sep 2024 385th Artemis21 🇬🇧 765 100 11ms 4 Jan 2025 387th CatsAreFluffy 763 64 53ms 4 Nov 2024 388th dokutan 763 83 480ms 3 Sep 2024 388th lifthrasiir 🇰🇷 763 83 429ms 2 Dec 2024 388th albanian-laundromat 763 83 453ms 4 Aug 2025 388th CaedenHarper 🇨🇦 763 83 487ms 9 Aug 2025 392nd error256 760 116 122ms 2 Sep 2024 393rd madex 🇩🇪 757 101 14ms 1 Sep 2024 393rd RedzGoose 🇦🇺 757 101 10ms 15 Oct 2024 393rd JunkIce 757 101 11ms 25 Oct 2024 393rd Flekay 🇩🇪 757 101 11ms 10 Jul 2025 397th kg583 🇺🇸 757 102 5ms 4 days ago 398th sean-niemann 🇺🇸 755 118 3ms 16 Jan 2025 399th albanian-laundromat 754 69 741ms 12 Sep 2025 400th Shanethegamer 🇺🇸 754 117 119ms 1 Sep 2024 First Prev 321–400 of 714 Next Last