The Calendar hole will go live in approximately 10 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 481st Shanethegamer 🇺🇸 689 206 30ms 4 Sep 2024 482nd JunkIce 688 92 718ms 3 Dec 2024 483rd GolfingSuccess 🇬🇷 686 131 2ms 1 Sep 2024 484th kaascevich 685 116 1,645ms 15 Sep 2025 485th emgordon154 682 288 1,927ms 2 Oct 2024 486th DialFrost 🇸🇬 681 62 45ms 30 Jan 2025 487th olleicua 🇺🇸 681 104 9ms 11 Sep 2024 487th charliegaming 681 104 9ms 28 Nov 2024 489th DialFrost 🇸🇬 681 118 93ms 22 Jun 2025 490th MeWhenI 🇻🇦 679 117 113ms 2 Sep 2024 490th stefangimmillaro 679 117 101ms 2 Sep 2024 492nd edsrzf 🇳🇿 678 92 5ms 10 Oct 2024 493rd BlankSpruce 676 158 86ms 1 Sep 2024 494th madex 🇩🇪 676 177 212ms 17 Sep 2024 495th dcgjb 674 69 292ms 11 Sep 2024 496th stefangimmillaro 670 63 52ms 2 Sep 2024 496th SirBogman 🇺🇸 670 63 37ms 5 Sep 2024 498th alicethecatwhisperermeow 669 132 395ms 14 Sep 2024 499th madeforlosers 668 106 8ms 23 Oct 2024 500th chunes3 🇺🇸 668 112 68ms 1 Sep 2024 501st DialFrost 🇸🇬 666 76 16ms 1 Aug 2025 502nd voytxt 🇨🇿 665 93 134ms 17 Apr 2025 503rd dokutan 662 79 245ms 3 Sep 2024 504th Maznek 662 107 9ms 8 Oct 2024 504th dokutan 662 107 9ms 5 Jun 2025 506th DialFrost 🇸🇬 661 181 193ms 12 Apr 2025 506th error256 661 181 175ms 22 May 2025 508th GolfingSuccess 🇬🇷 660 162 538ms 1 Sep 2024 508th ovs-code 🇩🇪 660 162 2,853ms 1 Sep 2024 510th LeoCh01 659 116 9ms 1 Sep 2024 511th NickTheEASDude 🇺🇸 657 105 2ms 7 Oct 2025 512th msbranicky 656 136 3ms 1 Sep 2024 513th msbranicky 655 95 3,872ms 8 Jan 2025 514th Shanethegamer 🇺🇸 655 135 422ms 1 Sep 2024 515th albanian-laundromat 655 189 44ms 14 Sep 2025 516th lukechampine 655 200 255ms 7 Jun 2025 516th jerrandolph 655 200 264ms 21 Sep 2025 518th Shanethegamer 🇺🇸 651 95 141ms 8 Jan 2025 519th AlephSquirrel 650 248 3ms 29 Sep 2024 520th TFeld00 🇩🇰 649 65 53ms 3 Sep 2024 521st ShiraJoseph 🇺🇸 649 109 9ms 22 Sep 2024 522nd msbranicky 646 203 257ms 1 Sep 2024 523rd error256 645 106 13ms 18 Apr 2025 524th Waffle3z 645 107 2ms 2 Oct 2024 525th stefangimmillaro 643 71 819ms 3 Sep 2024 526th mrxz 🇳🇱 643 110 9ms 22 Sep 2024 526th weliveinhell 🇭🇹 643 110 9ms 28 Sep 2024 528th Zhenyu-Bo 643 119 11ms 1 Aug 2025 529th BlankSpruce 642 140 2ms 1 Sep 2024 530th stefangimmillaro 640 151 437ms 6 Oct 2025 531st anter69 🇭🇺 639 66 51ms 25 Oct 2024 532nd emgordon154 639 113 112ms 17 days ago 533rd aDwarfNamedUrist 639 138 119ms 4 Sep 2024 534th SirBogman 🇺🇸 637 73 308ms 23 Jul 2025 535th lhulinsky 637 120 11ms 23 Oct 2024 535th arjunarya1 637 120 10ms 11 Sep 2025 537th stefangimmillaro 636 188 199ms 4 Jun 2025 538th emgordon154 635 40 3ms 20 Nov 2025 539th Shanethegamer 🇺🇸 634 72 861ms 1 Sep 2024 539th anter69 🇭🇺 634 72 858ms 25 Oct 2024 541st weeble 634 77 8ms 12 hours ago 542nd Ripick 633 127 392ms 6 Sep 2024 543rd KatieLG 🇬🇧 632 112 9ms 1 Sep 2024 543rd CaedenHarper 🇨🇦 632 112 10ms 22 Aug 2025 545th dokutan 632 120 6ms 1 Sep 2024 545th Shanethegamer 🇺🇸 632 120 6ms 2 Sep 2024 547th olleicua 🇺🇸 630 67 44ms 6 Sep 2024 548th RedzGoose 🇦🇺 627 101 475ms 15 Oct 2024 549th kevinnaviapaiva 627 122 12ms 16 Feb 2025 550th BalaM314 626 113 8ms 4 Feb 2025 551st cthierfelder 🇲🇨 624 193 77ms 5 Sep 2025 552nd kmathis22 623 155 356ms 6 days ago 553rd SirBogman 🇺🇸 622 59 158ms 23 Jul 2025 554th DialFrost 🇸🇬 622 111 2ms 22 Nov 2024 555th eddvrs 622 123 11ms 29 Sep 2024 556th KrausRaus 🇺🇸 621 114 11ms 1 Sep 2024 557th Shanethegamer 🇺🇸 620 68 37ms 1 Sep 2024 557th emgordon154 620 68 38ms 1 Sep 2024 557th rvs314 620 68 40ms 24 Sep 2024 557th tatzyr 🇯🇵 620 68 38ms 10 Oct 2025 First Prev 481–560 of 714 Next Last