The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
All holes in C# 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 Holes Points Bytes Submitted 881st bachmanntobias 1 465 159 8 May 2022 882nd DevDomJ 1 463 160 6 Jul 2022 882nd chrisevs-117 1 463 160 24 Jul 2023 884th SohelPerves 2 463 752 15 Jan 2025 885th patagonic 1 451 164 21 Nov 2021 885th alphafalfa 1 451 164 26 Aug 2024 887th janfalek 1 448 165 21 Nov 2021 888th alpfautz 1 448 194 21 Nov 2021 889th Sanctuspaladin 1 446 166 11 May 2023 890th GuacoIV 1 446 471 21 Nov 2021 891st MCausc78 🇺🇦 1 444 286 2 Jan 2023 892nd GWStuart 2 442 1,244 15 Sep 2023 893rd RYSF13 🇨🇳 1 440 166 10 Jul 2025 894th chartung17 1 438 169 1 Jan 2024 895th RedzGoose 🇦🇺 1 435 170 17 Sep 2024 896th brandon32389 1 433 171 21 Nov 2021 896th KiwiGeek 1 433 171 15 Mar 2025 898th antonfridh 1 433 201 17 Aug 2022 899th Noah-Fox 1 432 118 1 Jun 2022 900th AlephSquirrel 1 430 172 21 Nov 2021 901st KevinLaux 1 429 1,005 4 Dec 2022 902nd AcharyaS97 1 427 192 7 Aug 2022 903rd jiaminglimjm 🇲🇾 1 424 184 21 Nov 2021 904th Yareeeema 1 423 175 10 Jan 2023 905th kurkale6ka 3 421 2,672 21 Nov 2021 906th AiTlbx 1 420 176 30 Aug 2022 907th sentiww 1 413 179 21 Nov 2021 908th Anthony-Williams-06 1 411 124 30 Nov 2022 909th JiaC25 1 410 234 27 Jun 2023 910th b-smyers 1 410 312 30 Jan 2025 911th atazzam 🇺🇸 1 409 181 3 Sep 2022 912th stoyandimov 1 408 515 4 Sep 2024 913th tuxillator 1 405 519 20 Jan 2023 914th valgardg 🇮🇸 1 404 183 11 May 2022 915th 5si 1 402 184 21 Nov 2021 916th SniperSmiley 🇺🇸 1 400 185 1 Aug 2022 917th jcsawyer123 1 398 186 21 Nov 2021 918th Cloudy80 1 396 187 21 Nov 2021 918th ScienceSmart 1 396 187 21 Nov 2021 918th SergioMM0 1 396 187 24 Aug 2022 921st mpogudintrade 1 396 485 30 Oct 2023 922nd JensIssa 1 394 188 24 Aug 2022 922nd KyanJeuring 1 394 188 7 Sep 2022 924th ozefe 🇹🇷 1 388 188 21 Nov 2021 925th twocatsinatrenchcoat 1 387 191 25 Apr 2022 926th TonyProxy 2 387 866 21 Nov 2021 927th jackkav 1 381 194 31 Dec 2021 928th 0xDomi 1 380 216 6 Apr 2023 929th willpiam 1 369 168 20 Oct 2023 930th jakub-zidek 1 366 202 21 Nov 2021 931st varhammer 🇷🇺 1 365 200 31 Jan 2022 932nd atomlovelace 1 365 203 21 Nov 2021 933rd roguh 🇬🇹 1 357 319 18 Oct 2024 934th pronic32 1 356 208 21 Nov 2021 935th RokasBakutis 1 354 288 10 Apr 2023 936th BharadwajSridharan 🇮🇳 4 352 4,534 21 Nov 2021 937th boxjelly 1 351 222 21 Nov 2021 938th 0culist 1 348 603 27 Dec 2023 939th jaclynsmorris 1 342 1,261 26 Apr 2023 940th nicklas0110 1 341 217 24 Aug 2022 941st RaBa21 🇭🇺 3 341 3,167 19 Jul 2025 942nd SB-945 3 333 3,760 30 Nov 2024 943rd cdort 1 332 223 21 Nov 2021 944th troutser 1 329 225 11 Jan 2025 945th maximilliandeval 1 320 231 20 Feb 2024 946th zwxzwxzwx21 2 320 59,713 14 Feb 2025 947th theunofficialcoder 1 316 234 21 Nov 2021 948th spenceryonce 1 314 236 21 Nov 2021 948th JackieAlacrity2373 1 314 236 9 Jan 2023 950th hotmanga 1 314 277 18 Oct 2023 951st moziray 1 307 241 21 Nov 2021 952nd dis-justin 1 302 245 22 May 2024 953rd MrPancakes39 1 298 248 21 Mar 2023 954th jeff-at-tamer-dot-codes 🇺🇸 1 296 385 25 Aug 2023 955th Bananapants22 1 293 174 21 Aug 2022 956th JOrE-Softwares 2 288 1,820 3 Jun 2025 957th Viet-Khoa 1 286 259 26 Dec 2021 958th plainoldcheese 🇦🇶 1 274 270 17 Jan 2024 959th darren-richard 1 273 271 21 Nov 2021 960th dortega88 1 269 275 9 Dec 2021 First Prev 881–960 of 1,020 Next Last