The Calendar hole will go live in approximately 7 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 emplv 🇱🇻 764 192 264ms 20 Oct 2023 162nd MeWhenI 🇻🇦 763 259 650ms 5 Oct 2023 163rd emgordon154 760 138 123ms 31 Oct 2025 164th snoozingnewt 🇨🇦 760 260 119ms 20 Nov 2025 165th MeWhenI 🇻🇦 758 195 613ms 7 Nov 2025 166th SirBogman 🇺🇸 756 110 304ms 27 Jan 2024 167th inventshah 752 112 64ms 3 Sep 2023 168th snoozingnewt 🇨🇦 752 119 446ms 3 Nov 2025 169th Alex-x90 🇺🇸 750 84 1ms 1 Sep 2023 170th error256 750 174 3ms 28 Sep 2024 171st weliveinhell 🇭🇹 748 184 334ms 27 Sep 2023 172nd emgordon154 746 120 381ms 13 Apr 2025 173rd emgordon154 745 113 58ms 8 days ago 174th sean-niemann 🇺🇸 744 174 2ms 7 Aug 2025 175th nwellnhof 🇩🇪 741 85 2ms 10 Sep 2023 176th error256 738 114 55ms 14 days ago 177th stefangimmillaro 736 187 363ms 20 Jun 2025 178th emgordon154 735 101 46ms 11 Nov 2025 179th snoozingnewt 🇨🇦 734 119 26ms 3 Nov 2025 180th prplz 🇦🇺 733 86 2ms 27 Jan 2025 181st ovs-code 🇩🇪 733 143 120ms 3 Sep 2023 181st error256 733 143 124ms 28 May 2024 183rd stefangimmillaro 730 229 101ms 9 Sep 2023 184th m-tkach 🇺🇦 728 120 11ms 1 Sep 2023 185th emgordon154 728 145 9ms 18 Oct 2024 186th saito-ta 🇯🇵 724 87 2ms 26 Sep 2025 187th lifthrasiir 🇰🇷 724 101 3ms 30 Nov 2024 188th xsot 🇸🇬 723 179 23ms 19 Jun 2025 189th emgordon154 722 121 43ms 13 Apr 2025 190th SirBogman 🇺🇸 721 547 15ms 27 Sep 2023 191st ovs-code 🇩🇪 719 117 58ms 3 Sep 2023 191st MostParsingVex 719 117 65ms 19 Jan 2025 193rd stefangimmillaro 718 206 413ms 6 Oct 2025 194th MostParsingVex 716 88 2ms 20 Jan 2025 194th KasperKivimaeki 🇫🇮 716 88 2ms 28 Oct 2025 196th sean-niemann 🇺🇸 714 207 447ms 26 Sep 2025 197th nwellnhof 🇩🇪 709 149 9ms 11 Sep 2023 198th inventshah 708 89 2ms 3 Sep 2023 199th inventshah 708 148 123ms 3 Sep 2023 200th sean-niemann 🇺🇸 706 195 366ms 20 Jun 2025 201st m-tkach 🇺🇦 705 287 33ms 18 Jan 2024 202nd stefangimmillaro 704 224 3,563ms 11 Nov 2024 203rd lynn 704 274 185ms 12 Jun 2024 204th AlephSquirrel 702 220 8ms 22 Jan 2025 205th MostParsingVex 701 225 3,448ms 11 Nov 2024 206th madeforlosers 700 151 9ms 7 Nov 2023 207th adamnielson42 🇺🇸 694 107 223ms 6 Sep 2023 207th CaedenHarper 🇨🇦 694 107 225ms 30 Jan 2025 209th duckyluuk 🇳🇱 693 126 121ms 5 Jul 2025 210th IanUtley 691 274 596ms 4 Feb 2025 211th error256 690 173 377ms 9 Oct 2024 212th Waffle3z 687 180 2ms 12 Sep 2023 213th weliveinhell 🇭🇹 686 174 277ms 6 Jan 2024 214th edsrzf 🇳🇿 681 346 5ms 18 Oct 2025 215th canissimia 🇦🇶 680 120 54ms 16 Sep 2023 215th sisyphus-ppcg 🇦🇺 680 120 33ms 17 Nov 2023 217th GrayJoKing 🇦🇺 679 104 318ms 17 Nov 2023 218th stefangimmillaro 679 216 273ms 7 Sep 2023 219th duckyluuk 🇳🇱 678 132 466ms 28 Aug 2024 219th albanian-laundromat 678 132 519ms 4 Aug 2025 221st CatsAreFluffy 677 93 2ms 16 Feb 2024 222nd nwellnhof 🇩🇪 674 121 42ms 10 Sep 2023 223rd nwellnhof 🇩🇪 673 105 307ms 15 Nov 2023 224th weliveinhell 🇭🇹 672 130 11ms 14 Oct 2023 225th namelessiw 671 205 386ms 21 Jul 2025 226th Alex-x90 🇺🇸 668 157 114ms 9 Jan 2025 227th MeWhenI 🇻🇦 663 123 51ms 1 Sep 2023 228th dokutan 663 135 353ms 10 Sep 2025 229th albanian-laundromat 662 132 146ms 6 May 2025 230th pardouin 🇫🇷 659 130 930ms 10 Aug 2025 231st ovs-code 🇩🇪 658 124 49ms 13 May 2025 232nd ovs-code 🇩🇪 658 136 503ms 17 Mar 2025 233rd neel11235813 657 113 217ms 10 Oct 2023 234th stefangimmillaro 657 204 27ms 17 Sep 2023 234th targrik 657 204 7ms 15 May 2025 236th edsrzf 🇳🇿 657 235 8ms 15 days ago 237th pardouin 🇫🇷 655 210 416ms 25 Oct 2024 238th KatieLG 🇬🇧 654 137 484ms 28 Oct 2024 239th tayloia 🇬🇧 652 162 9ms 23 Nov 2024 240th pardouin 🇫🇷 651 227 431ms 24 Sep 2025 First Prev 161–240 of 1,346 Next Last