The Calendar hole will go live in approximately 3 days. Why not try and solve it ahead of time?
All holes in Haskell 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 Holes Points Chars Submitted 317th 2b7q8 1 833 96 30 Jul 2024 322nd ffrancesc 🇲🇸 1 825 97 16 Feb 2021 323rd brightly-salty 1 822 129 4 Feb 2022 324th KingSkyrock 🇺🇸 1 800 75 11 Feb 2022 325th rf0444 1 800 100 26 Jun 2020 326th Foxinatel 1 795 83 4 Jan 2022 327th kottbullepizza 1 792 101 8 Oct 2025 328th polyrtm 1 789 90 14 Apr 2022 329th rexim 1 786 308 28 Aug 2020 330th zt14427 3 779 1,365 3 Feb 2025 331st pdcxs 1 778 45 18 Nov 2024 332nd fourtf 1 777 103 28 Aug 2020 333rd ethanmassie 1 769 104 13 Jul 2022 333rd myclevorname 🇺🇸 1 769 104 23 Jul 2024 335th redstarrer 1 761 46 11 Jan 2021 335th minarjos 1 761 46 11 Jan 2021 335th Andrey2001 1 761 46 27 Nov 2025 338th Artemis21 🇬🇧 1 755 98 21 Dec 2024 339th Kudostoy0u 1 748 107 22 Feb 2021 340th Just4FunCoder 2 748 1,076 18 Jun 2025 341st phpboyscout 1 745 47 3 Sep 2019 341st Vexxter9 🇳🇱 1 745 47 22 Sep 2024 343rd wearsunscreen 2 740 859 19 Oct 2023 344th El-PowerPtr 1 735 83 22 Aug 2025 345th olavaga 1 734 109 3 Feb 2022 345th keelimeguy 🇺🇸 1 734 109 23 Oct 2023 347th lukechampine 1 729 48 16 Apr 2020 347th JohanWiltink 1 729 48 12 Feb 2021 347th emgordon154 1 729 48 3 Aug 2024 350th Msleizak 🇫🇷 3 727 1,868 15 Dec 2023 351st jdkleuver 1 722 335 8 Aug 2022 352nd utkarshkukreti 1 721 111 18 May 2022 353rd SB-945 2 716 1,210 11 Oct 2023 354th LeoVanderSteege 1 714 84 25 Nov 2025 355th lillycham 1 714 112 18 Apr 2023 355th Lv0Sys 🇵🇱 1 714 112 30 May 2025 357th LiquidPulsar 1 712 104 24 Jan 2023 358th vonKrafft 2 712 197 26 Mar 2020 359th puzzleninja 1 708 113 19 Jul 2019 360th alaaeelsayed 1 700 50 23 Jul 2018 360th doge1338 1 700 50 15 Dec 2020 360th varhammer 🇷🇺 1 700 50 31 Jan 2022 360th CedricGebistorf 1 700 50 4 Feb 2022 360th ndren 1 700 50 28 Aug 2023 360th weliveinhell 🇭🇹 1 700 50 1 Oct 2023 366th Betuaredead 1 700 70 17 Jan 2023 366th XavierRex 1 700 70 13 May 2024 368th awnion 1 696 102 22 Apr 2021 369th HaroldVemeno 1 696 115 2 Jan 2022 370th zbreit 🇺🇸 1 693 88 25 Jun 2023 371st Jiramide 1 689 177 8 Feb 2021 372nd acodon 1 686 51 11 Jul 2019 373rd LuisGoncalves05 🇵🇹 4 683 6,294 1 Aug 2025 374th Trickermand 1 682 355 25 Jul 2020 375th valentinstoecker 1 678 118 8 Jun 2020 376th howsiyu 3 678 618 8 Apr 2019 377th MEAN-stack 1 676 494 8 Feb 2021 378th relet 1 673 52 9 Aug 2018 378th magnusbakken 1 673 52 6 Dec 2021 380th regob 1 672 119 31 Jul 2021 381st aliakseikalosha 1 667 120 14 Oct 2024 381st Zounon 1 667 120 19 Aug 2025 383rd enmiligi 1 650 123 8 Mar 2023 384th Seiryn21 1 648 54 15 Dec 2021 385th HuggieBo 1 648 108 28 Oct 2023 386th RaBa21 🇭🇺 4 640 3,374 19 Jul 2025 387th thisishowmymindworks 🇳🇴 1 636 55 31 Jul 2020 387th theunofficialcoder 1 636 55 2 Sep 2021 387th fredrik-bakke 🇳🇴 1 636 55 29 Sep 2022 390th jurepustos 1 636 77 11 Dec 2020 390th regr4 1 636 77 13 Nov 2023 392nd tjbcg 1 632 68 8 Apr 2019 393rd SubsTheTechnomancer 1 631 529 28 Mar 2023 394th volpi-m 🇫🇷 1 630 127 19 Mar 2024 394th RedzGoose 🇦🇺 1 630 127 18 Sep 2024 396th neonchickens 1 625 128 10 Nov 2023 397th Ibozz91 1 622 98 20 Nov 2025 398th namelessiw 1 615 130 22 Jan 2024 398th Kesefon 1 615 130 3 Oct 2024 400th andres-dr 1 611 131 13 May 2020 First Prev 321–400 of 544 Next Last