The Calendar hole will go live in approximately 6 days. Why not try and solve it ahead of time?
Topological Sort 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 161st lukegustafson 🇺🇸 668 104 97ms 20 Jul 2025 162nd albanian-laundromat 668 276 2,160ms 25 days ago 163rd jupj 🇫🇮 663 185 3ms 28 Aug 2025 164th GolfingSuccess 🇬🇷 662 95 705ms 11 Jul 2025 165th FEZfan 🇦🇺 662 105 28ms 12 Jul 2025 166th nwellnhof 🇩🇪 652 62 114ms 2 Aug 2025 167th trinityy-7 648 127 11ms 6 Aug 2025 168th bizy-coder 644 108 107ms 25 Jul 2025 168th zacjl 644 108 95ms 26 Jul 2025 170th Shanethegamer 🇺🇸 644 158 4ms 8 Aug 2025 171st edsrzf 🇳🇿 643 167 4,660ms 14 Aug 2025 172nd albanian-laundromat 636 160 291ms 22 Aug 2025 173rd Seek64 🇩🇪 632 110 74ms 30 Jul 2025 174th bizy-coder 629 100 1,346ms 14 Jul 2025 174th KatieLG 🇬🇧 629 100 487ms 6 Oct 2025 176th GolfingSuccess 🇬🇷 626 111 26ms 11 Jul 2025 177th Shanethegamer 🇺🇸 625 106 1,217ms 16 Aug 2025 178th Ripick 625 209 390ms 5 Aug 2025 179th Natanaelel 🇸🇪 622 65 67ms 31 Jul 2025 180th yjgnaw 621 112 17ms 24 Jul 2025 180th 5cw 🇺🇸 621 112 255ms 7 Aug 2025 182nd Shanethegamer 🇺🇸 620 137 2,066ms 4 Aug 2025 183rd ovs-code 🇩🇪 615 113 110ms 10 Jul 2025 184th Shanethegamer 🇺🇸 614 92 49ms 8 Aug 2025 185th Shanethegamer 🇺🇸 614 134 13ms 12 Jul 2025 186th GolfingSuccess 🇬🇷 613 200 3ms 23 Jul 2025 187th Shanethegamer 🇺🇸 609 134 313ms 9 Aug 2025 188th error256 608 93 52ms 6 Aug 2025 189th albanian-laundromat 608 192 446ms 2 Nov 2025 190th Shanethegamer 🇺🇸 606 156 3,083ms 10 Aug 2025 191st ovs-code 🇩🇪 599 105 845ms 10 Jul 2025 191st Shanethegamer 🇺🇸 599 105 693ms 11 Jul 2025 193rd duckyluuk 🇳🇱 599 116 654ms 31 Jul 2025 194th olleicua 🇺🇸 595 95 42ms 5 Aug 2025 195th jerrandolph 595 344 294ms 20 Sep 2025 196th RaBa21 🇭🇺 594 117 16ms 11 Aug 2025 197th tatzyr 🇯🇵 589 96 43ms 12 Aug 2025 198th SirBogman 🇺🇸 587 79 38ms 8 Aug 2025 199th edsrzf 🇳🇿 584 119 30ms 16 Aug 2025 200th duckyluuk 🇳🇱 583 108 1,123ms 31 Jul 2025 201st MeWhenI 🇻🇦 580 50 96ms 30 Jul 2025 201st emgordon154 580 50 940ms 6 Nov 2025 203rd albanian-laundromat 578 226 563ms 22 Aug 2025 204th Shanethegamer 🇺🇸 574 121 135ms 11 Jul 2025 204th SirBogman 🇺🇸 574 121 73ms 30 Jul 2025 206th albanian-laundromat 572 178 106ms 16 Oct 2025 207th inventshah 570 122 16ms 4 Aug 2025 207th ryyyn 🇺🇸 570 122 19ms 5 Nov 2025 207th KasperKivimaeki 🇫🇮 570 122 170ms 26 Nov 2025 207th Emutis 🇱🇹 570 122 15ms 13 days ago 207th blaztoma 🇱🇹 570 122 15ms 13 days ago 212th SirBogman 🇺🇸 569 51 8ms 5 Aug 2025 213th CLOStrophobic 🇮🇹 568 189 58ms 25 hours ago 214th AlephSquirrel 565 123 19ms 10 Jul 2025 214th commandblockguy 🇺🇸 565 123 34ms 11 Jul 2025 214th bzijlema 🇳🇱 565 123 18ms 6 Aug 2025 217th aiwana 562 469 404ms 25 Oct 2025 218th SirBogman 🇺🇸 557 113 936ms 4 Aug 2025 219th Shanethegamer 🇺🇸 554 152 169ms 8 Aug 2025 220th bricknellj 552 126 19ms 14 Jul 2025 221st Shanethegamer 🇺🇸 551 102 20ms 9 Aug 2025 221st albanian-laundromat 551 102 2,136ms 24 Sep 2025 223rd albanian-laundromat 548 183 143ms 30 Oct 2025 224th commandblockguy 🇺🇸 547 115 610ms 1 Sep 2025 225th jared-hughes 545 151 14ms 13 Oct 2025 226th KatieLG 🇬🇧 543 104 92ms 2 Oct 2025 227th Natanaelel 🇸🇪 543 128 117ms 21 Jul 2025 228th AlephSquirrel 540 199 629ms 2 Aug 2025 229th MeWhenI 🇻🇦 539 129 33ms 12 Jul 2025 229th BREMAUCY 🇫🇷 539 129 51ms 6 Aug 2025 231st albanian-laundromat 539 569 56ms 20 days ago 232nd davecame 535 130 20ms 9 Aug 2025 232nd RYNO8 535 130 90ms 6 Oct 2025 234th tailorspy 530 282 2,640ms 12 Aug 2025 235th CaedenHarper 🇨🇦 529 387 319ms 17 Nov 2025 236th emgordon154 527 132 153ms 18 Nov 2025 237th snoozingnewt 🇨🇦 523 337 283ms 23 Nov 2025 238th blaztoma 🇱🇹 522 264 155ms 27 days ago 239th emgordon154 520 121 723ms 18 Nov 2025 240th ahmetdemirag 🇨🇾 519 134 40ms 10 Aug 2025 First Prev 161–240 of 344 Next Last