The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
τ 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 561st daedals 702 90 15ms 6 Jun 2019 561st Attero 🇸🇪 702 90 19ms 5 Oct 2020 561st knutae 🇳🇴 702 90 14ms 14 Jul 2021 561st DrPiranoid 702 90 14ms 26 Mar 2023 561st fourth-bit 702 90 15ms 23 Jun 2023 561st BREMAUCY 🇫🇷 702 90 14ms 29 Apr 2024 561st qpwoeirut 702 90 25ms 2 Oct 2025 568th marcin7Cd 702 93 170ms 13 Mar 2021 569th AlephSquirrel 701 46 54ms 10 Feb 2023 570th Natanaelel 🇸🇪 701 64 1,030ms 21 Apr 2025 571st Babafaba 700 86 492ms 23 Nov 2025 572nd prplz 🇦🇺 699 72 556ms 12 Jun 2020 573rd pardouin 🇫🇷 699 89 4,009ms 24 Jun 2025 574th jared-hughes 698 58 44ms 9 hours ago 575th commandblockguy 🇺🇸 695 56 207ms 7 Nov 2023 576th GeorgeStechman 🇬🇧 693 86 19ms 20 Jun 2022 577th MeWhenI 🇻🇦 691 90 940ms 13 Nov 2022 578th 4hg 🇺🇸 687 47 60ms 22 Jul 2022 579th jacklynnepenick 687 92 21ms 25 Aug 2021 579th Bonjour27891 🇻🇳 687 92 23ms 2 May 2022 579th CatsAreFluffy 687 92 27ms 7 Dec 2022 582nd Alex-x90 🇺🇸 687 146 10ms 10 Aug 2023 582nd madex 🇩🇪 687 146 6ms 28 Oct 2024 584th retrohun 687 857 31ms 3 Jan 2023 585th duckyluuk 🇳🇱 686 176 431ms 25 Sep 2025 586th 52525rr 685 87 10ms 12 Jun 2025 586th JOrE20 🇺🇸 685 87 15ms 27 Nov 2025 588th tfkls 683 57 197ms 16 Oct 2020 588th latvianfarmer17 🇱🇻 683 57 205ms 20 Jul 2023 588th davbass 🇮🇹 683 57 237ms 25 Aug 2023 591st MeWhenI 🇻🇦 681 144 782ms 21 Dec 2022 592nd stefangimmillaro 680 212 266ms 13 Dec 2024 593rd MeWhenI 🇻🇦 680 213 2,251ms 12 Jan 2025 594th tomh1012 679 147 379ms 11 Sep 2025 595th primo-ppcg 🇹🇭 679 178 537ms 13 Jul 2020 595th Lydxn 🇨🇦 679 178 514ms 28 Dec 2021 597th primo-ppcg 🇹🇭 678 54 18ms 29 Nov 2020 597th trinityy-7 678 54 38ms 16 Feb 2024 599th SirBogman 🇺🇸 676 86 846ms 21 Feb 2024 600th Shanethegamer 🇺🇸 675 60 55ms 2 Jun 2022 601st Alex-x90 🇺🇸 675 175 65ms 21 Oct 2022 602nd Mandrzejy 🇵🇱 674 149 6ms 14 Apr 2024 602nd marshallward 🇺🇸 674 149 52ms 6 May 2025 604th ImpressedByRocks 672 94 908ms 22 May 2025 605th Indivicivet 671 58 198ms 30 Mar 2021 606th xyangst 670 89 10ms 12 Oct 2024 606th gigaprofisi 🇺🇸 670 89 78ms 25 Jul 2025 608th BREMAUCY 🇫🇷 669 90 409ms 19 days ago 609th emgordon154 669 93 1,101ms 17 Nov 2024 610th primo-ppcg 🇹🇭 666 197 2,136ms 3 Feb 2022 611th btjones0 665 95 18ms 6 Dec 2021 611th quimey 665 95 87ms 17 Mar 2023 613th prplz 🇦🇺 664 61 48ms 13 Oct 2020 614th CaedenHarper 🇨🇦 664 182 656ms 30 Oct 2025 615th SirBogman 🇺🇸 661 152 42ms 3 Jun 2025 616th pardouin 🇫🇷 660 73 759ms 24 days ago 617th MeWhenI 🇻🇦 660 183 501ms 7 Nov 2025 618th MeWhenI 🇻🇦 656 200 3,055ms 3 Sep 2023 619th CatsAreFluffy 655 92 484ms 15 Jan 2024 620th anter69 🇭🇺 654 95 960ms 22 Feb 2023 621st MeWhenI 🇻🇦 654 901 4ms 11 hours ago 622nd SirBogman 🇺🇸 653 62 52ms 1 Oct 2022 623rd stefangimmillaro 653 185 461ms 6 Oct 2025 624th prestosilver 🇺🇸 652 154 21ms 23 days ago 625th janbehrens 🇩🇪 652 181 418ms 15 May 2023 626th jared-hughes 650 186 457ms 24 Sep 2025 627th itiievskyi 🇺🇦 649 60 200ms 21 Aug 2020 627th heanyang1 649 60 221ms 29 May 2025 629th MeWhenI 🇻🇦 648 183 51ms 17 Feb 2023 630th AlephSquirrel 645 206 132ms 3 Aug 2023 631st Natanaelel 🇸🇪 643 63 41ms 21 Apr 2025 632nd inventshah 643 156 4ms 28 Apr 2023 633rd CaedenHarper 🇨🇦 643 224 276ms 1 Nov 2025 634th MeWhenI 🇻🇦 641 76 706ms 1 Nov 2023 635th olivermrose 🇺🇸 641 93 11ms 6 Oct 2021 636th namelessiw 639 189 491ms 15 Nov 2025 637th albanian-laundromat 639 192 467ms 18 Oct 2025 638th MeWhenI 🇻🇦 638 185 66ms 21 May 2023 639th MeWhenI 🇻🇦 637 79 275ms 28 Jan 2023 640th emgordon154 635 110 3,624ms 12 Jul 2025 First Prev 561–640 of 2,269 Next Last