The Calendar hole will go live in approximately 8 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 Herbert00709 🇵🇱 689 39 99ms 5 May 2024 562nd NewDefectus 🇮🇱 689 82 30ms 12 Oct 2020 562nd wen1now 689 82 11ms 7 Nov 2023 562nd ei14 689 82 30ms 23 May 2024 565th Yax42 🇫🇷 689 142 397ms 25 Dec 2024 566th Alex-x90 🇺🇸 687 146 10ms 10 Aug 2023 566th madex 🇩🇪 687 146 6ms 28 Oct 2024 568th 52525rr 685 87 10ms 12 Jun 2025 568th JOrE20 🇺🇸 685 87 15ms 26 days ago 570th clockworknazo 683 98 410ms 23 Oct 2022 571st lynn 680 74 1,341ms 19 Nov 2021 572nd tfkls 678 56 253ms 16 Oct 2020 572nd latvianfarmer17 🇱🇻 678 56 293ms 20 Jul 2023 572nd davbass 🇮🇹 678 56 297ms 25 Aug 2023 575th Shanethegamer 🇺🇸 676 60 77ms 2 Jun 2022 575th KatieLG 🇬🇧 676 60 39ms 2 Oct 2025 577th primo-ppcg 🇹🇭 676 176 547ms 13 Jul 2020 577th Lydxn 🇨🇦 676 176 514ms 28 Dec 2021 577th duckyluuk 🇳🇱 676 176 431ms 25 Sep 2025 580th stefangimmillaro 675 212 266ms 13 Dec 2024 581st SirBogman 🇺🇸 674 86 846ms 21 Feb 2024 582nd Alex-x90 🇺🇸 674 175 65ms 21 Oct 2022 583rd Mandrzejy 🇵🇱 673 149 6ms 14 Apr 2024 583rd marshallward 🇺🇸 673 149 52ms 6 May 2025 585th MeWhenI 🇻🇦 673 196 3ms 12 Aug 2024 586th yokasuretsu 672 84 12ms 14 Apr 2018 587th dokutan 670 197 3ms 12 Aug 2024 588th xyangst 669 89 10ms 12 Oct 2024 588th gigaprofisi 🇺🇸 669 89 78ms 25 Jul 2025 590th primo-ppcg 🇹🇭 668 52 18ms 29 Nov 2020 591st ovs-code 🇩🇪 668 118 2,681ms 16 Aug 2023 592nd emgordon154 667 93 1,101ms 17 Nov 2024 593rd Indivicivet 666 57 265ms 30 Mar 2021 594th jmerle 🇳🇱 665 61 57ms 13 Jul 2023 595th HETHAT 🇩🇿 665 85 18ms 3 Aug 2025 596th tomh1012 665 147 379ms 11 Sep 2025 597th primo-ppcg 🇹🇭 665 197 2,136ms 3 Feb 2022 598th targrik 661 111 3,591ms 4 Jan 2025 599th SirBogman 🇺🇸 660 152 42ms 3 Jun 2025 600th trinityy-7 656 53 38ms 16 Feb 2024 601st MeWhenI 🇻🇦 655 200 3,055ms 3 Sep 2023 602nd anter69 🇭🇺 653 95 960ms 22 Feb 2023 603rd CaedenHarper 🇨🇦 653 182 656ms 30 Oct 2025 604th janbehrens 🇩🇪 652 181 440ms 15 May 2023 605th prestosilver 🇺🇸 651 154 21ms 21 days ago 606th MeWhenI 🇻🇦 650 183 501ms 7 Nov 2025 607th yzhs 🇩🇪 649 87 27ms 25 Oct 2020 608th MeWhenI 🇻🇦 648 83 146ms 3 Aug 2024 609th pardouin 🇫🇷 647 73 759ms 22 days ago 610th XenThe 🇬🇧 647 92 11ms 1 Jul 2025 611th MeWhenI 🇻🇦 647 183 51ms 17 Feb 2023 612th AlephSquirrel 645 206 132ms 3 Aug 2023 613th jaredcrystal 🇺🇸 644 63 43ms 18 Sep 2018 613th BREMAUCY 🇫🇷 644 63 41ms 27 Mar 2024 613th Natanaelel 🇸🇪 644 63 37ms 21 Apr 2025 616th itiievskyi 🇺🇦 643 59 263ms 21 Aug 2020 616th heanyang1 643 59 275ms 29 May 2025 618th inventshah 643 156 4ms 28 Apr 2023 619th stefangimmillaro 643 185 461ms 6 Oct 2025 620th RYNO8 642 88 1,992ms 27 Aug 2021 621st olivermrose 🇺🇸 640 93 11ms 6 Oct 2021 622nd MeWhenI 🇻🇦 639 76 706ms 1 Nov 2023 623rd jared-hughes 639 186 457ms 24 Sep 2025 624th CaedenHarper 🇨🇦 639 224 276ms 1 Nov 2025 625th MeWhenI 🇻🇦 638 185 72ms 21 May 2023 626th albanian-laundromat 638 192 467ms 18 Oct 2025 627th MeWhenI 🇻🇦 637 105 4,072ms 28 Jun 2023 628th namelessiw 636 187 491ms 15 Nov 2025 629th MeWhenI 🇻🇦 635 79 275ms 28 Jan 2023 630th glesnick 635 89 34ms 18 Aug 2022 631st janbehrens 🇩🇪 635 158 7ms 15 May 2023 632nd stefangimmillaro 635 218 132ms 6 Nov 2023 633rd Yewzir 🇧🇪 634 64 41ms 9 Mar 2024 633rd DialFrost 🇸🇬 634 64 42ms 1 Jun 2024 633rd jared-hughes 634 64 45ms 26 Dec 2024 633rd dokutan 634 64 50ms 21 Apr 2025 637th emgordon154 634 110 4,060ms 12 Jul 2025 638th emgordon154 632 194 751ms 1 Jun 2025 639th cure-honey 🇯🇵 632 276 67ms 8 Jul 2021 640th SirBogman 🇺🇸 632 374 216ms 12 Jul 2023 First Prev 561–640 of 2,257 Next Last