The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
τ in all languages 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 Points Chars Time Submitted 561st GeorgeStechman 🇬🇧 692 86 19ms 20 Jun 2022 562nd commandblockguy 🇺🇸 690 55 258ms 7 Nov 2023 563rd MeWhenI 🇻🇦 690 90 940ms 13 Nov 2022 564th orthoplex 🇨🇽 690 293 2ms 9 Jun 2024 565th Herbert00709 🇵🇱 689 39 99ms 5 May 2024 566th NewDefectus 🇮🇱 689 82 30ms 12 Oct 2020 566th wen1now 689 82 11ms 7 Nov 2023 566th ei14 689 82 30ms 23 May 2024 569th Yax42 🇫🇷 688 142 397ms 25 Dec 2024 570th Alex-x90 🇺🇸 687 146 10ms 10 Aug 2023 570th madex 🇩🇪 687 146 6ms 28 Oct 2024 572nd 52525rr 684 87 10ms 12 Jun 2025 572nd JOrE20 🇺🇸 684 87 15ms 20 days ago 574th clockworknazo 683 98 410ms 23 Oct 2022 575th lynn 680 74 1,341ms 19 Nov 2021 576th tfkls 678 56 253ms 16 Oct 2020 576th latvianfarmer17 🇱🇻 678 56 293ms 20 Jul 2023 576th davbass 🇮🇹 678 56 297ms 25 Aug 2023 579th Shanethegamer 🇺🇸 676 60 77ms 2 Jun 2022 579th KatieLG 🇬🇧 676 60 39ms 2 Oct 2025 581st primo-ppcg 🇹🇭 676 176 547ms 13 Jul 2020 581st Lydxn 🇨🇦 676 176 514ms 28 Dec 2021 581st duckyluuk 🇳🇱 676 176 431ms 25 Sep 2025 584th stefangimmillaro 675 212 266ms 13 Dec 2024 585th SirBogman 🇺🇸 674 86 846ms 21 Feb 2024 586th Alex-x90 🇺🇸 674 175 65ms 21 Oct 2022 587th Mandrzejy 🇵🇱 673 149 6ms 14 Apr 2024 587th marshallward 🇺🇸 673 149 52ms 6 May 2025 589th MeWhenI 🇻🇦 673 196 3ms 12 Aug 2024 590th yokasuretsu 672 84 12ms 14 Apr 2018 591st dokutan 670 197 3ms 12 Aug 2024 592nd xyangst 669 89 10ms 12 Oct 2024 592nd gigaprofisi 🇺🇸 669 89 78ms 25 Jul 2025 594th primo-ppcg 🇹🇭 668 52 18ms 29 Nov 2020 595th ovs-code 🇩🇪 668 118 2,681ms 16 Aug 2023 596th emgordon154 667 93 1,101ms 17 Nov 2024 597th Indivicivet 666 57 265ms 30 Mar 2021 598th jmerle 🇳🇱 665 61 57ms 13 Jul 2023 599th HETHAT 🇩🇿 665 85 18ms 3 Aug 2025 600th tomh1012 665 147 379ms 11 Sep 2025 601st primo-ppcg 🇹🇭 665 197 2,136ms 3 Feb 2022 602nd targrik 661 111 3,410ms 4 Jan 2025 603rd SirBogman 🇺🇸 660 152 42ms 3 Jun 2025 604th trinityy-7 656 53 38ms 16 Feb 2024 605th MeWhenI 🇻🇦 655 200 3,055ms 3 Sep 2023 606th anter69 🇭🇺 653 95 960ms 22 Feb 2023 607th CaedenHarper 🇨🇦 653 182 656ms 30 Oct 2025 608th janbehrens 🇩🇪 652 181 440ms 15 May 2023 609th prestosilver 🇺🇸 651 154 21ms 15 days ago 610th MeWhenI 🇻🇦 650 183 501ms 7 Nov 2025 611th yzhs 🇩🇪 649 87 27ms 25 Oct 2020 612th MeWhenI 🇻🇦 648 83 146ms 3 Aug 2024 613th pardouin 🇫🇷 647 73 759ms 17 days ago 614th XenThe 🇬🇧 647 92 11ms 1 Jul 2025 615th MeWhenI 🇻🇦 647 183 51ms 17 Feb 2023 616th AlephSquirrel 645 206 132ms 3 Aug 2023 617th jaredcrystal 🇺🇸 644 63 43ms 18 Sep 2018 617th BREMAUCY 🇫🇷 644 63 41ms 27 Mar 2024 617th Natanaelel 🇸🇪 644 63 37ms 21 Apr 2025 620th itiievskyi 🇺🇦 643 59 263ms 21 Aug 2020 620th heanyang1 643 59 275ms 29 May 2025 622nd inventshah 643 156 4ms 28 Apr 2023 623rd stefangimmillaro 643 185 461ms 6 Oct 2025 624th RYNO8 642 88 1,992ms 27 Aug 2021 625th olivermrose 🇺🇸 640 93 11ms 6 Oct 2021 626th MeWhenI 🇻🇦 639 76 706ms 1 Nov 2023 627th jared-hughes 639 186 457ms 24 Sep 2025 628th CaedenHarper 🇨🇦 639 224 276ms 1 Nov 2025 629th MeWhenI 🇻🇦 638 185 72ms 21 May 2023 630th albanian-laundromat 638 192 467ms 18 Oct 2025 631st MeWhenI 🇻🇦 637 105 4,072ms 28 Jun 2023 632nd namelessiw 636 187 491ms 15 Nov 2025 633rd MeWhenI 🇻🇦 635 79 275ms 28 Jan 2023 634th glesnick 635 89 34ms 18 Aug 2022 635th janbehrens 🇩🇪 635 158 7ms 15 May 2023 636th stefangimmillaro 635 218 132ms 6 Nov 2023 637th Yewzir 🇧🇪 634 64 41ms 9 Mar 2024 637th DialFrost 🇸🇬 634 64 42ms 1 Jun 2024 637th jared-hughes 634 64 45ms 26 Dec 2024 637th dokutan 634 64 50ms 21 Apr 2025 First Prev 561–640 of 2,258 Next Last