The Calendar hole will go live in approximately 13 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 241st dokutan 647 135 11ms 10 Sep 2025 242nd GrayJoKing 🇦🇺 642 127 40ms 18 Nov 2023 243rd SirBogman 🇺🇸 640 231 405ms 27 Sep 2023 244th SirBogman 🇺🇸 638 132 63ms 5 Mar 2024 245th KatieLG 🇬🇧 638 137 117ms 29 Jul 2024 245th ovs-code 🇩🇪 638 137 34ms 17 Mar 2025 247th emgordon154 638 151 121ms 18 Oct 2024 248th dvargas46 🇺🇸 636 164 7ms 7 Sep 2023 249th weliveinhell 🇭🇹 630 284 2ms 15 Jan 2024 250th blaztoma 🇱🇹 629 118 269ms 19 Oct 2025 251st CaedenHarper 🇨🇦 629 235 456ms 10 Oct 2025 252nd AlephSquirrel 628 139 30ms 4 Feb 2024 253rd error256 628 163 367ms 8 Sep 2024 254th xnor-gate 624 140 363ms 9 Sep 2023 254th wh3n3v3r 🇨🇿 624 140 111ms 18 Nov 2024 256th DialFrost 🇸🇬 624 237 368ms 24 Sep 2025 257th emplv 🇱🇻 621 155 137ms 19 Oct 2025 258th lifthrasiir 🇰🇷 621 170 10ms 23 Nov 2024 259th edsrzf 🇳🇿 619 141 9ms 9 days ago 260th Natanaelel 🇸🇪 618 132 58ms 10 Sep 2023 261st emgordon154 618 366 100ms 10 days ago 262nd acotis 617 170 139ms 29 May 2025 263rd stefangimmillaro 616 222 41ms 26 Apr 2025 264th nwellnhof 🇩🇪 615 142 36ms 15 Nov 2023 264th bizy-coder 615 142 16ms 29 Oct 2024 266th Babafaba 613 146 376ms 30 Oct 2025 267th CaedenHarper 🇨🇦 613 239 275ms 4 Nov 2025 268th dokutan 612 682 400ms 6 days ago 269th ovs-code 🇩🇪 610 168 284ms 12 May 2024 270th iczelia 🇩🇪 608 122 341ms 8 Nov 2025 271st weliveinhell 🇭🇹 607 141 1,099ms 6 Jun 2024 272nd luuumine 🇫🇷 607 144 17ms 27 days ago 273rd GolfingSuccess 🇬🇷 604 338 4ms 19 Aug 2024 274th MeWhenI 🇻🇦 603 142 1,056ms 1 Sep 2023 275th lyphyser 603 174 133ms 8 Sep 2023 276th canissimia 🇦🇶 602 145 88ms 9 Sep 2023 276th SB-945 602 145 51ms 12 Sep 2025 278th SirBogman 🇺🇸 601 149 523ms 20 Jan 2024 279th emgordon154 600 105 2ms 27 Sep 2025 280th SirBogman 🇺🇸 600 204 1,324ms 21 Sep 2023 281st Babafaba 598 146 26ms 30 Oct 2025 282nd GrayJoKing 🇦🇺 597 150 771ms 16 Jan 2024 283rd CaedenHarper 🇨🇦 596 231 376ms 19 Oct 2025 284th emgordon154 596 283 5ms 10 Jan 2025 285th annaproxy 595 318 15ms 1 Sep 2023 286th inventshah 594 249 396ms 3 Sep 2023 287th dcgjb 590 141 355ms 5 Jun 2024 288th juliusgeo 590 148 21ms 17 Sep 2023 288th 5cw 🇺🇸 590 148 443ms 17 Jul 2025 290th MeWhenI 🇻🇦 587 246 6ms 11 Oct 2023 291st emgordon154 587 348 4ms 30 Aug 2024 292nd anter69 🇭🇺 586 146 920ms 12 days ago 293rd vhoulbreque 🇫🇷 582 150 29ms 15 days ago 294th duckyluuk 🇳🇱 582 570 6ms 13 Jun 2025 295th JOrE20 🇺🇸 582 736 7ms 21 days ago 296th AdrienHache 🇫🇷 581 143 224ms 2 Jan 2024 297th MeWhenI 🇻🇦 581 154 449ms 17 Jan 2024 298th anter69 🇭🇺 578 141 33ms 12 days ago 299th GrayJoKing 🇦🇺 578 151 25ms 15 Nov 2023 299th yzhs 🇩🇪 578 151 17ms 24 Mar 2024 301st janbehrens 🇩🇪 578 232 4ms 30 Dec 2023 302nd Yax42 🇫🇷 578 238 404ms 20 Jun 2025 303rd FlorianCassayre 🇫🇷 575 152 11ms 18 Sep 2023 303rd Seek64 🇩🇪 575 152 22ms 5 Jun 2024 305th Yewzir 🇧🇪 575 577 6ms 18 Dec 2024 306th jared-hughes 571 185 9ms 7 Sep 2023 306th stefangimmillaro 571 185 12ms 30 Sep 2024 308th MeWhenI 🇻🇦 567 154 40ms 1 Sep 2023 309th Argeento 🇵🇱 565 187 9ms 4 Oct 2023 310th sisyphus-ppcg 🇦🇺 564 155 12ms 2 days ago 311th snoozingnewt 🇨🇦 563 280 4,978ms 3 Nov 2025 312th jmerle 🇳🇱 563 760 7ms 1 Sep 2023 313th dokutan 558 767 7ms 12 Jan 2024 313th error256 558 767 7ms 7 Jul 2024 313th KatieLG 🇬🇧 558 767 7ms 31 Jul 2024 313th Shanethegamer 🇺🇸 558 767 9ms 11 May 2025 313th snoozingnewt 🇨🇦 558 767 7ms 3 Oct 2025 318th MeWhenI 🇻🇦 555 186 730ms 15 Sep 2025 319th Steffan153 🇫🇮 554 241 41ms 20 Jul 2024 320th ndren 551 777 9ms 1 Sep 2023 First Prev 241–320 of 1,340 Next Last