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 641st Shanethegamer 🇺🇸 630 91 101ms 2 Jun 2022 642nd daedals 628 90 15ms 6 Jun 2019 642nd knutae 🇳🇴 628 90 14ms 14 Jul 2021 642nd DrPiranoid 628 90 14ms 26 Mar 2023 642nd fourth-bit 628 90 15ms 23 Jun 2023 642nd BREMAUCY 🇫🇷 628 90 14ms 29 Apr 2024 642nd qpwoeirut 628 90 25ms 2 Oct 2025 648th emgordon154 628 210 3,568ms 7 Sep 2024 649th stefangimmillaro 627 160 43ms 26 Apr 2025 650th CatsAreFluffy 626 104 215ms 14 Dec 2022 651st tatzyr 🇯🇵 624 65 40ms 27 Apr 2021 651st olleicua 🇺🇸 624 65 39ms 13 Mar 2024 651st emgordon154 624 65 58ms 7 Aug 2024 651st blaztoma 🇱🇹 624 65 63ms 12 Oct 2025 655th stefangimmillaro 624 214 195ms 21 Oct 2023 656th rambox11 623 161 7ms 12 Mar 2019 657th GalladeGuy 🇺🇸 623 180 102ms 25 May 2020 657th Waffle3z 623 180 585ms 8 Apr 2022 659th Natanaelel 🇸🇪 621 62 1,186ms 21 Apr 2025 660th cure-honey 🇯🇵 619 231 267ms 25 Jun 2021 661st Haksell 🇦🇶 615 66 41ms 5 Apr 2020 661st proton 🇩🇪 615 66 45ms 8 Jun 2020 663rd Bonjour27891 🇻🇳 614 92 23ms 2 May 2022 663rd CatsAreFluffy 614 92 27ms 7 Dec 2022 665th KatieLG 🇬🇧 614 97 10ms 5 Oct 2025 666th emgordon154 614 110 44ms 10 Dec 2024 667th alphafalfa 611 63 3,760ms 19 Dec 2024 668th MeWhenI 🇻🇦 608 165 53ms 29 Apr 2025 669th sk- 606 67 54ms 12 Sep 2019 669th tadd 606 67 49ms 17 Apr 2020 669th janbehrens 🇩🇪 606 67 42ms 16 Jan 2021 669th shellbertt 🇨🇦 606 67 53ms 6 Dec 2021 669th purp 606 67 49ms 13 Aug 2022 669th aksyristos 606 67 41ms 3 Feb 2023 669th Lv0Sys 🇵🇱 606 67 41ms 6 Jun 2025 676th MeWhenI 🇻🇦 606 219 115ms 28 Jul 2023 677th Bubbler-4 604 96 2,448ms 25 Jan 2022 678th bendiscz 604 237 279ms 20 Apr 2020 679th janAkali 🇷🇺 603 218 431ms 28 Jun 2025 680th Yewzir 🇧🇪 601 94 16ms 27 May 2023 680th ImpressedByRocks 601 94 908ms 22 May 2025 682nd BREMAUCY 🇫🇷 600 163 381ms 29 Jul 2025 683rd MeWhenI 🇻🇦 600 167 3ms 1 Aug 2023 684th MeWhenI 🇻🇦 600 394 846ms 29 Aug 2023 685th snoozingnewt 🇨🇦 598 79 736ms 21 Nov 2025 686th BREMAUCY 🇫🇷 598 90 409ms 16 days ago 687th Indivicivet 597 68 43ms 30 Mar 2021 687th annaproxy 597 68 44ms 5 Nov 2022 689th stefangabos 🇷🇴 596 100 10ms 26 Aug 2022 690th quimey 595 95 87ms 17 Mar 2023 690th roupiq 🇵🇱 595 95 38ms 18 Apr 2024 692nd cure-honey 🇯🇵 589 227 926ms 7 Jul 2021 693rd duckyluuk 🇳🇱 586 119 4,128ms 29 Oct 2024 694th Mabeloid 🇳🇴 586 236 118ms 26 Oct 2025 695th CatsAreFluffy 585 92 484ms 15 Jan 2024 696th AlephSquirrel 584 46 84ms 10 Feb 2023 697th Thonoton 584 65 229ms 24 Feb 2023 697th Natanaelel 🇸🇪 584 65 239ms 16 Jul 2023 699th Bonjour27891 🇻🇳 584 102 10ms 12 Mar 2022 700th snoozingnewt 🇨🇦 584 229 154ms 21 Nov 2025 701st dokutan 584 237 119ms 11 Jan 2024 702nd kmathis22 583 204 488ms 15 days ago 703rd Yewzir 🇧🇪 582 246 269ms 3 Jan 2024 704th FnControlOption 580 70 41ms 21 Aug 2022 705th unfinishedprogram 578 103 10ms 21 Feb 2024 706th flawr 577 113 752ms 2 Jan 2019 707th dokutan 577 248 290ms 4 Jan 2024 708th KatieLG 🇬🇧 576 98 155ms 11 Dec 2022 708th cingulataluke 576 98 15ms 26 Aug 2023 710th dan-simon 575 67 332ms 29 Dec 2017 711th MeWhenI 🇻🇦 574 167 475ms 13 Oct 2023 712th Yewzir 🇧🇪 573 94 424ms 15 Jan 2024 713th boxjelly 573 175 4ms 7 Feb 2021 714th 4hg 🇺🇸 572 47 82ms 22 Jul 2022 715th yokasuretsu 572 71 49ms 15 Apr 2018 715th Irratix 🇳🇱 572 71 82ms 27 Jun 2022 717th MeWhenI 🇻🇦 572 230 409ms 15 Nov 2022 718th fisxoj 571 86 19ms 28 Apr 2018 719th MeWhenI 🇻🇦 570 61 12ms 15 Feb 2025 720th janbehrens 🇩🇪 570 88 268ms 3 Dec 2023 First Prev 641–720 of 2,257 Next Last