The Calendar hole will go live in approximately 12 days. Why not try and solve it ahead of time?
λ 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 321st janbehrens 🇩🇪 735 196 739ms 7 Nov 2021 322nd inventshah 735 219 46ms 16 Jun 2022 323rd Yewzir 🇧🇪 735 688 6ms 19 Dec 2024 324th duckyluuk 🇳🇱 733 245 4,498ms 8 Jul 2025 325th tatzyr 🇯🇵 731 204 178ms 1 Jan 2025 326th marcin7Cd 729 221 3,460ms 17 Dec 2020 327th CaedenHarper 🇨🇦 728 233 104ms 2 Sep 2025 328th Waffle3z 727 713 1ms 8 Jul 2021 328th Lydxn 🇨🇦 727 713 2ms 26 Aug 2021 330th primo-ppcg 🇹🇭 726 714 2ms 13 Feb 2019 331st Herbert00709 🇵🇱 722 223 274ms 4 Jun 2024 332nd emgordon154 721 233 165ms 5 Sep 2024 333rd Kacarott 🇦🇺 721 240 118ms 13 Sep 2024 334th emgordon154 721 268 2,242ms 9 Dec 2024 335th yzhs 🇩🇪 720 200 728ms 21 Jun 2022 336th roguh 🇬🇹 719 262 134ms 26 Jan 2024 337th inventshah 718 236 23ms 16 Jun 2022 338th plcc0 716 225 46ms 30 Mar 2025 339th targrik 716 694 5ms 23 May 2025 340th CaedenHarper 🇨🇦 715 295 543ms 26 Oct 2025 341st retrohun 715 846 30ms 3 Jan 2023 342nd NewDefectus 🇮🇱 713 226 455ms 25 Oct 2020 343rd CaedenHarper 🇨🇦 711 209 1,022ms 22 Oct 2025 344th SirBogman 🇺🇸 710 155 83ms 29 Oct 2022 345th madex 🇩🇪 709 227 57ms 26 Jul 2025 346th ArmaanAS 709 239 23ms 2 Apr 2021 347th MeWhenI 🇻🇦 708 703 2ms 10 Sep 2022 348th MeWhenI 🇻🇦 707 269 570ms 15 Aug 2022 349th roguh 🇬🇹 706 228 88ms 31 May 2024 349th qpwoeirut 706 228 4,013ms 11 Oct 2025 351st dmrichwa 🇺🇸 706 240 24ms 8 Oct 2023 352nd orthoplex 🇨🇽 706 718 3ms 28 Sep 2020 353rd primo-ppcg 🇹🇭 704 754 2ms 2 Oct 2020 353rd btnlq 704 754 2ms 3 Oct 2020 355th Lv0Sys 🇵🇱 703 212 1,713ms 18 days ago 356th itsh01 701 242 23ms 21 Nov 2022 356th scpchicken 🇵🇼 701 242 106ms 22 Feb 2023 358th Yewzir 🇧🇪 701 710 2ms 18 Jan 2024 359th prplz 🇦🇺 700 721 88ms 18 Jan 2020 360th frosster 699 742 1ms 30 Apr 2025 361st flawr 698 270 621ms 1 Jan 2019 362nd prplz 🇦🇺 697 764 25ms 17 Apr 2022 363rd emgordon154 696 207 2,567ms 2 Oct 2024 364th roguh 🇬🇹 695 278 250ms 8 Dec 2024 365th MichalMarsalek 🇨🇿 694 232 144ms 13 Jan 2023 366th primo-ppcg 🇹🇭 692 769 25ms 12 May 2023 367th prplz 🇦🇺 690 724 206ms 16 Oct 2020 368th MeWhenI 🇻🇦 689 246 24ms 8 Dec 2021 369th primo-ppcg 🇹🇭 689 725 227ms 17 Oct 2020 370th primo-ppcg 🇹🇭 689 733 76ms 20 Jan 2020 371st knutae 🇳🇴 688 234 128ms 14 Jul 2021 372nd canissimia 🇦🇶 688 396 1,165ms 27 May 2023 373rd Shanethegamer 🇺🇸 687 261 929ms 5 Apr 2023 374th CedricGebistorf 685 235 48ms 10 Mar 2022 375th orthoplex 🇨🇽 685 774 2ms 9 Jun 2024 376th primo-ppcg 🇹🇭 683 709 100ms 10 Dec 2022 377th commandblockguy 🇺🇸 682 236 55ms 17 Nov 2023 377th andrewjc2000 682 236 98ms 2 May 2025 379th ydevor 🇮🇱 679 237 1,946ms 22 Feb 2021 379th DialFrost 🇸🇬 679 237 50ms 13 Jul 2024 379th Babafaba 679 237 48ms 7 Nov 2025 382nd snoozingnewt 🇨🇦 679 370 131ms 12 days ago 383rd Shanethegamer 🇺🇸 678 250 23ms 5 Apr 2023 384th thospel 678 256 780ms 14 Jun 2018 385th MeWhenI 🇻🇦 676 213 416ms 15 Feb 2023 386th MeWhenI 🇻🇦 675 163 87ms 26 Jul 2022 387th commandblockguy 🇺🇸 673 236 483ms 15 Jan 2024 388th snoozingnewt 🇨🇦 673 750 611ms 6 Nov 2025 389th MeWhenI 🇻🇦 673 898 4ms 25 May 2022 390th Babafaba 671 237 637ms 7 Nov 2025 391st Shanethegamer 🇺🇸 671 240 47ms 5 Apr 2023 392nd Yewzir 🇧🇪 671 722 114ms 6 Jul 2023 393rd Shanethegamer 🇺🇸 668 223 69ms 5 Apr 2023 394th nstearns96 🇬🇧 668 241 56ms 20 Jan 2023 395th snoozingnewt 🇨🇦 668 725 99ms 6 Nov 2025 396th billings7 🇬🇧 667 316 413ms 18 Apr 2022 397th KatieLG 🇬🇧 665 242 97ms 28 Nov 2020 398th pandapawskat 665 255 23ms 28 Sep 2021 399th MeWhenI 🇻🇦 664 253 164ms 3 Aug 2024 400th snoozingnewt 🇨🇦 664 745 73ms 4 Nov 2025 First Prev 321–400 of 2,452 Next Last