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 800th thehylian 451 140 23ms 17 Sep 2023 802nd yzhs 🇩🇪 450 145 2,527ms 27 Jul 2021 803rd klixel 🇨🇦 448 141 32ms 17 Oct 2024 803rd Code-Coder-coder 448 141 140ms 13 Oct 2025 805th stefangimmillaro 448 156 3,492ms 8 Dec 2024 806th iznax 447 223 387ms 21 Nov 2021 807th kenny14231 445 142 1,325ms 5 Aug 2022 807th dirckvdende 445 142 16ms 2 Aug 2025 809th sleepyStick 442 143 16ms 7 Dec 2021 809th asadullayev 442 143 36ms 8 Jul 2022 809th suwat513 442 143 37ms 16 Jun 2023 812th marcin7Cd 439 112 42ms 4 Feb 2021 813th mueller14003 439 144 25ms 19 Apr 2018 813th Starwort 🇬🇧 439 144 15ms 28 May 2019 813th dzshn 439 144 30ms 18 Aug 2021 813th smokestacklightnin 🇺🇸 439 144 26ms 23 Feb 2024 817th Yewzir 🇧🇪 436 138 452ms 15 Jan 2024 818th ly0va 436 145 15ms 3 Jan 2019 818th michelebastione 🇮🇹 436 145 28ms 7 Jul 2019 818th cingulataluke 436 145 15ms 26 Aug 2023 818th rollershutter 436 145 35ms 26 Sep 2025 822nd boxjelly 436 277 423ms 2 Mar 2021 823rd guliyevemil1 🇦🇿 433 146 15ms 17 Apr 2020 823rd KatieLG 🇬🇧 433 146 150ms 1 Nov 2020 823rd m42km 433 146 10ms 10 Oct 2023 826th piano-miles 432 138 3,761ms 19 Feb 2023 827th MeWhenI 🇻🇦 430 112 827ms 15 Sep 2025 828th MaxElf999 430 147 17ms 27 Sep 2022 829th AkashTandon167 429 234 3ms 6 Nov 2019 830th lukechampine 429 336 275ms 16 Apr 2020 831st cthierfelder 🇲🇨 427 148 163ms 4 Sep 2025 832nd albanian-laundromat 426 278 583ms 22 Aug 2025 833rd Mabeloid 🇳🇴 424 149 24ms 7 Sep 2024 833rd blaztoma 🇱🇹 424 149 28ms 4 Oct 2025 835th BrenSchaap 422 96 60ms 12 Nov 2021 836th saito-ta 🇯🇵 422 1,396 2ms 1 Aug 2023 837th bkshrader 421 150 315ms 30 Dec 2018 837th bac0id 421 150 15ms 20 Sep 2023 839th pschmid0 🇺🇸 420 209 105ms 17 Oct 2022 840th skps2010 419 151 30ms 12 Jan 2019 840th sultan 419 151 28ms 9 Mar 2024 842nd lifthrasiir 🇰🇷 419 597 7ms 11 Dec 2024 843rd Ralac07 🇦🇺 413 153 33ms 4 Jul 2024 843rd gthayden23 413 153 33ms 4 Oct 2024 845th KatieLG 🇬🇧 412 146 763ms 15 Jan 2024 846th Shanethegamer 🇺🇸 410 120 98ms 2 Jun 2022 847th trist224 🇫🇷 410 154 15ms 29 Nov 2022 847th SniperSmiley 🇺🇸 410 154 41ms 24 Dec 2022 849th boxjelly 405 156 71ms 10 Jan 2021 849th nullie 405 156 558ms 18 Jun 2022 851st Mabeloid 🇳🇴 404 149 772ms 22 Sep 2024 852nd gigaprofisi 🇺🇸 403 157 25ms 2 Mar 2025 853rd albanian-laundromat 402 277 1,072ms 5 Sep 2025 854th jacobly0 🇺🇸 400 158 10ms 8 Oct 2023 854th christensendaniel 400 158 30ms 13 May 2024 854th Andrey2001 400 158 1,051ms 7 days ago 857th dcgjb 399 126 326ms 14 May 2024 858th NickTheEASDude 🇺🇸 398 92 3,588ms 26 Apr 2024 859th adamnielson42 🇺🇸 398 150 17ms 24 Apr 2023 860th DABANANAMAN120 397 159 63ms 28 Jun 2025 861st lahell 396 127 260ms 23 Jul 2020 862nd elgan65536 396 305 2,646ms 17 Apr 2024 863rd itiievskyi 🇺🇦 395 160 34ms 6 Aug 2020 863rd 0dyse 395 160 997ms 23 Apr 2025 865th inventshah 392 308 483ms 20 Apr 2021 866th zakariamouhid 390 153 15ms 18 May 2023 867th PyPylia 🇦🇺 388 163 28ms 7 Aug 2020 867th jmerle 🇳🇱 388 163 15ms 6 Jul 2023 867th cefqrn 388 163 15ms 13 Apr 2025 870th doge1338 387 372 293ms 20 Mar 2021 871st ashwinvis 385 164 36ms 18 Apr 2020 871st brobbins2001 385 164 33ms 17 Oct 2022 871st codewrite 🇬🇧 385 164 16ms 28 Jun 2025 874th dymowski 383 165 12ms 3 May 2020 875th jtaxen 381 166 14ms 26 Mar 2024 876th Pena86 378 167 12ms 6 Jan 2022 877th Waffle3z 378 298 554ms 29 Oct 2020 878th edre 377 158 60ms 6 May 2018 879th msrawson 376 168 14ms 29 Aug 2018 880th LiamKrenn 374 169 36ms 21 Jul 2022 First Prev 801–880 of 2,268 Next Last