The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Rijndael S-box 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 MeWhenI 🇻🇦 763 259 650ms 5 Oct 2023 162nd emgordon154 760 138 123ms 31 Oct 2025 163rd snoozingnewt 🇨🇦 760 260 119ms 20 Nov 2025 164th MeWhenI 🇻🇦 758 195 613ms 7 Nov 2025 165th SirBogman 🇺🇸 756 110 307ms 27 Jan 2024 166th inventshah 752 112 83ms 3 Sep 2023 167th snoozingnewt 🇨🇦 752 119 446ms 3 Nov 2025 168th Alex-x90 🇺🇸 750 84 1ms 1 Sep 2023 169th error256 750 174 3ms 28 Sep 2024 170th weliveinhell 🇭🇹 748 184 334ms 27 Sep 2023 171st emgordon154 746 120 381ms 13 Apr 2025 172nd emgordon154 745 113 75ms 4 days ago 173rd nwellnhof 🇩🇪 741 85 2ms 10 Sep 2023 174th error256 738 114 55ms 9 days ago 175th stefangimmillaro 736 187 393ms 20 Jun 2025 176th emgordon154 735 101 46ms 11 Nov 2025 177th snoozingnewt 🇨🇦 734 119 26ms 3 Nov 2025 178th prplz 🇦🇺 733 86 2ms 27 Jan 2025 179th ovs-code 🇩🇪 733 143 120ms 3 Sep 2023 179th error256 733 143 124ms 28 May 2024 181st stefangimmillaro 730 229 101ms 9 Sep 2023 182nd m-tkach 🇺🇦 728 120 11ms 1 Sep 2023 183rd emgordon154 728 145 9ms 18 Oct 2024 184th saito-ta 🇯🇵 724 87 2ms 26 Sep 2025 185th lifthrasiir 🇰🇷 724 101 3ms 30 Nov 2024 186th emgordon154 722 121 43ms 13 Apr 2025 187th SirBogman 🇺🇸 721 547 15ms 27 Sep 2023 188th ovs-code 🇩🇪 719 117 64ms 3 Sep 2023 188th MostParsingVex 719 117 79ms 19 Jan 2025 190th stefangimmillaro 718 206 413ms 6 Oct 2025 191st MostParsingVex 716 88 2ms 20 Jan 2025 191st KasperKivimaeki 🇫🇮 716 88 2ms 28 Oct 2025 193rd sean-niemann 🇺🇸 714 207 447ms 26 Sep 2025 194th nwellnhof 🇩🇪 709 149 9ms 11 Sep 2023 195th inventshah 708 89 2ms 3 Sep 2023 196th inventshah 708 148 123ms 3 Sep 2023 197th sean-niemann 🇺🇸 706 195 393ms 20 Jun 2025 198th m-tkach 🇺🇦 705 287 33ms 18 Jan 2024 199th stefangimmillaro 704 224 4,123ms 11 Nov 2024 200th lynn 704 274 185ms 12 Jun 2024 201st AlephSquirrel 702 220 8ms 22 Jan 2025 202nd MostParsingVex 701 225 4,115ms 11 Nov 2024 203rd madeforlosers 700 151 9ms 7 Nov 2023 204th adamnielson42 🇺🇸 694 107 223ms 6 Sep 2023 204th CaedenHarper 🇨🇦 694 107 294ms 30 Jan 2025 206th duckyluuk 🇳🇱 693 126 121ms 5 Jul 2025 207th IanUtley 691 274 596ms 4 Feb 2025 208th error256 690 173 377ms 9 Oct 2024 209th Waffle3z 687 180 2ms 12 Sep 2023 210th weliveinhell 🇭🇹 686 174 277ms 6 Jan 2024 211th edsrzf 🇳🇿 681 346 5ms 18 Oct 2025 212th canissimia 🇦🇶 680 120 55ms 16 Sep 2023 212th sisyphus-ppcg 🇦🇺 680 120 41ms 17 Nov 2023 214th GrayJoKing 🇦🇺 679 104 484ms 17 Nov 2023 215th stefangimmillaro 679 216 273ms 7 Sep 2023 216th duckyluuk 🇳🇱 678 132 466ms 28 Aug 2024 216th albanian-laundromat 678 132 519ms 4 Aug 2025 218th CatsAreFluffy 677 93 2ms 16 Feb 2024 219th nwellnhof 🇩🇪 674 121 42ms 10 Sep 2023 220th nwellnhof 🇩🇪 673 105 533ms 15 Nov 2023 221st weliveinhell 🇭🇹 672 130 11ms 14 Oct 2023 222nd namelessiw 671 205 386ms 21 Jul 2025 223rd Alex-x90 🇺🇸 668 157 114ms 9 Jan 2025 224th MeWhenI 🇻🇦 663 123 51ms 1 Sep 2023 225th dokutan 663 135 353ms 10 Sep 2025 226th albanian-laundromat 662 132 146ms 6 May 2025 227th pardouin 🇫🇷 659 130 930ms 10 Aug 2025 228th ovs-code 🇩🇪 658 124 68ms 13 May 2025 229th ovs-code 🇩🇪 658 136 503ms 17 Mar 2025 230th neel11235813 657 113 217ms 10 Oct 2023 231st stefangimmillaro 657 204 26ms 17 Sep 2023 231st targrik 657 204 6ms 15 May 2025 233rd edsrzf 🇳🇿 657 235 8ms 11 days ago 234th pardouin 🇫🇷 655 210 416ms 25 Oct 2024 235th KatieLG 🇬🇧 654 137 484ms 28 Oct 2024 236th tayloia 🇬🇧 652 162 9ms 23 Nov 2024 237th pardouin 🇫🇷 651 227 431ms 24 Sep 2025 238th AlephSquirrel 649 138 563ms 4 Feb 2024 239th sisyphus-ppcg 🇦🇺 648 163 9ms 1 Sep 2023 239th Steffan153 🇫🇮 648 163 8ms 19 Oct 2023 First Prev 161–240 of 1,341 Next Last