The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
Roman to Arabic 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 797th tobyLovick 617 154 19ms 7 Dec 2023 797th chartung17 617 154 25ms 14 Jan 2024 797th EnTerr 617 154 19ms 25 Aug 2024 797th Pyroan 617 154 22ms 3 Nov 2025 805th retrohun 616 111 15ms 21 Sep 2024 806th Shanethegamer 🇺🇸 615 130 29ms 4 Oct 2024 807th CaedenHarper 🇨🇦 614 131 410ms 17 Aug 2025 808th filharmonista 614 138 3ms 13 Mar 2020 808th TeodorDyakov 🇧🇬 614 138 3ms 3 Jul 2025 810th hiddicop 🇸🇪 613 94 56ms 1 Feb 2021 811th neihousaigaai 613 124 15ms 28 Apr 2021 811th Andrey-Plotnikov 613 124 13ms 9 Aug 2025 813th dzhang314 613 155 19ms 14 Aug 2019 813th za3k 613 155 22ms 11 Oct 2022 813th r-benson 🇬🇧 613 155 27ms 1 Feb 2023 813th Hortaros 613 155 19ms 14 Apr 2023 813th HumanoidCPU 613 155 21ms 7 Jun 2024 818th TomvdPeet 611 129 29ms 14 days ago 819th dokutan 610 132 330ms 7 Apr 2025 820th G33kDude 609 156 18ms 20 Mar 2019 820th cellobix 609 156 23ms 15 Aug 2019 820th mokymok 🇺🇸 609 156 19ms 11 Oct 2021 820th BREMAUCY 🇫🇷 609 156 25ms 2 Jan 2024 820th hiichbindermax 609 156 20ms 15 Sep 2024 820th M4rc0g1 609 156 21ms 21 Nov 2025 826th dsntzn 🇸🇰 608 125 14ms 1 Mar 2021 826th smclaughlin-cf 608 125 14ms 8 Apr 2025 828th cure-honey 🇯🇵 608 200 43ms 26 Apr 2020 829th MeWhenI 🇻🇦 607 105 29ms 12 Nov 2022 830th targrik 606 130 16ms 27 Oct 2025 831st Phil-RGOMEGA 606 149 10ms 30 Aug 2023 832nd adamnielson42 🇺🇸 605 79 39ms 7 Dec 2023 833rd ndren 605 130 558ms 5 May 2024 834th janbehrens 🇩🇪 605 140 4ms 18 May 2023 835th tpaxman 🇨🇦 605 157 22ms 2 Dec 2020 836th ollyspooner 603 126 13ms 18 Oct 2023 837th albanian-laundromat 603 178 40ms 22 Aug 2025 838th snoozingnewt 🇨🇦 602 164 118ms 20 Nov 2025 839th lynn 602 182 19ms 18 Nov 2021 840th Jacob385 601 131 507ms 3 Apr 2024 840th Stockoh 🇫🇷 601 131 701ms 24 Jun 2024 842nd DialFrost 🇸🇬 601 133 31ms 11 Dec 2024 843rd not-a-pokemon 601 141 4ms 9 Sep 2025 844th sisyphus-ppcg 🇦🇺 599 114 221ms 24 Jun 2022 845th eranws 599 127 14ms 9 Sep 2022 846th timvermeulen 599 190 161ms 4 Jan 2020 847th zdzc 598 159 22ms 10 Jul 2018 847th rzhade3 598 159 21ms 1 Jul 2021 847th NicoAdams 598 159 19ms 21 Nov 2021 847th rowboat1 598 159 656ms 18 Jun 2022 851st avartanii 594 128 22ms 17 Jan 2021 851st MathisBullinger 594 128 22ms 15 Nov 2021 853rd abailey2020 🇺🇸 594 160 21ms 13 Dec 2020 853rd Espiobest 594 160 22ms 13 Feb 2021 853rd knutae 🇳🇴 594 160 18ms 17 Nov 2021 853rd jfallon1997 594 160 22ms 5 Jan 2023 853rd AtengChen 594 160 19ms 29 Aug 2024 858th CaedenHarper 🇨🇦 593 124 3,442ms 18 Aug 2025 859th yzhs 🇩🇪 592 75 41ms 7 Jun 2022 860th CaedenHarper 🇨🇦 592 98 5ms 18 Aug 2025 861st emgordon154 592 133 1,037ms 25 Sep 2024 862nd CaedenHarper 🇨🇦 592 135 123ms 18 Aug 2025 863rd timvermeulen 592 167 94ms 19 Jan 2020 864th mtirado1 590 153 6ms 18 Apr 2023 865th hardlyBearable 590 161 21ms 11 May 2019 865th Psirving 590 161 20ms 1 Aug 2020 865th SniperSmiley 🇺🇸 590 161 19ms 25 Jun 2022 865th GulgDev 590 161 21ms 21 Mar 2023 869th ian-odonnell 589 129 14ms 9 Mar 2018 869th JohnSBarden 589 129 13ms 9 Nov 2021 871st CaedenHarper 🇨🇦 588 144 4ms 16 Nov 2025 872nd KatieLG 🇬🇧 588 168 694ms 15 Jan 2023 873rd TheZwierzLF 🇵🇱 587 134 976ms 22 Nov 2025 874th msrawson 587 162 21ms 15 Aug 2018 875th ian-h-chamberlain 🇺🇸 587 194 159ms 6 Jan 2020 876th omurakazuaki 🇯🇵 585 130 13ms 16 Feb 2021 877th MeWhenI 🇻🇦 585 168 1,370ms 16 Jun 2023 878th SirBogman 🇺🇸 585 403 81ms 23 Nov 2022 879th fgrosshans 🇫🇷 583 163 25ms 10 Jun 2024 879th Papushkado 583 163 19ms 10 Nov 2025 First Prev 801–880 of 1,455 Next Last