The Calendar hole will go live in approximately 8 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 240th Steffan153 🇫🇮 648 163 8ms 19 Oct 2023 240th snoozingnewt 🇨🇦 648 163 8ms 4 Nov 2025 243rd dokutan 647 135 11ms 10 Sep 2025 244th GrayJoKing 🇦🇺 642 127 40ms 18 Nov 2023 245th SirBogman 🇺🇸 640 231 405ms 27 Sep 2023 246th SirBogman 🇺🇸 638 132 63ms 5 Mar 2024 247th KatieLG 🇬🇧 638 137 117ms 29 Jul 2024 247th ovs-code 🇩🇪 638 137 34ms 17 Mar 2025 249th emgordon154 638 151 121ms 18 Oct 2024 250th dvargas46 🇺🇸 636 164 7ms 7 Sep 2023 251st weliveinhell 🇭🇹 630 284 2ms 15 Jan 2024 252nd blaztoma 🇱🇹 629 118 269ms 19 Oct 2025 253rd CaedenHarper 🇨🇦 629 235 456ms 10 Oct 2025 254th AlephSquirrel 628 139 30ms 4 Feb 2024 255th error256 628 163 367ms 8 Sep 2024 256th xnor-gate 624 140 363ms 9 Sep 2023 256th wh3n3v3r 🇨🇿 624 140 111ms 18 Nov 2024 258th DialFrost 🇸🇬 624 237 368ms 24 Sep 2025 259th emplv 🇱🇻 621 155 137ms 19 Oct 2025 260th lifthrasiir 🇰🇷 621 170 10ms 23 Nov 2024 261st edsrzf 🇳🇿 619 141 9ms 14 days ago 262nd Natanaelel 🇸🇪 618 132 58ms 10 Sep 2023 263rd emgordon154 618 366 100ms 14 days ago 264th acotis 617 170 139ms 29 May 2025 265th stefangimmillaro 616 222 41ms 26 Apr 2025 266th nwellnhof 🇩🇪 615 142 36ms 15 Nov 2023 266th bizy-coder 615 142 16ms 29 Oct 2024 268th Babafaba 613 146 376ms 30 Oct 2025 269th CaedenHarper 🇨🇦 613 239 275ms 4 Nov 2025 270th dokutan 612 682 400ms 10 days ago 271st ovs-code 🇩🇪 610 168 284ms 12 May 2024 272nd iczelia 🇩🇪 608 122 341ms 8 Nov 2025 273rd weliveinhell 🇭🇹 607 141 1,099ms 6 Jun 2024 274th luuumine 🇫🇷 607 144 17ms 21 Nov 2025 275th GolfingSuccess 🇬🇷 604 338 4ms 19 Aug 2024 276th MeWhenI 🇻🇦 603 142 1,056ms 1 Sep 2023 277th lyphyser 603 174 133ms 8 Sep 2023 278th canissimia 🇦🇶 602 145 88ms 9 Sep 2023 278th SB-945 602 145 51ms 12 Sep 2025 280th SirBogman 🇺🇸 601 149 523ms 20 Jan 2024 281st emgordon154 600 105 2ms 27 Sep 2025 282nd SirBogman 🇺🇸 600 204 1,324ms 21 Sep 2023 283rd Babafaba 598 146 26ms 30 Oct 2025 284th GrayJoKing 🇦🇺 597 150 771ms 16 Jan 2024 285th CaedenHarper 🇨🇦 596 231 376ms 19 Oct 2025 286th emgordon154 596 283 5ms 10 Jan 2025 287th annaproxy 595 318 15ms 1 Sep 2023 288th inventshah 594 249 396ms 3 Sep 2023 289th dcgjb 590 141 355ms 5 Jun 2024 290th juliusgeo 590 148 21ms 17 Sep 2023 290th 5cw 🇺🇸 590 148 443ms 17 Jul 2025 292nd MeWhenI 🇻🇦 587 246 6ms 11 Oct 2023 293rd emgordon154 587 348 4ms 30 Aug 2024 294th anter69 🇭🇺 586 146 920ms 17 days ago 295th vhoulbreque 🇫🇷 582 150 29ms 20 days ago 296th duckyluuk 🇳🇱 582 570 6ms 13 Jun 2025 297th JOrE20 🇺🇸 582 736 7ms 25 days ago 298th AdrienHache 🇫🇷 581 143 224ms 2 Jan 2024 299th MeWhenI 🇻🇦 581 154 449ms 17 Jan 2024 300th anter69 🇭🇺 579 141 33ms 17 days ago 301st GrayJoKing 🇦🇺 578 151 25ms 15 Nov 2023 301st yzhs 🇩🇪 578 151 17ms 24 Mar 2024 303rd janbehrens 🇩🇪 578 232 6ms 30 Dec 2023 304th Yax42 🇫🇷 578 238 404ms 20 Jun 2025 305th FlorianCassayre 🇫🇷 575 152 11ms 18 Sep 2023 305th Seek64 🇩🇪 575 152 22ms 5 Jun 2024 307th Yewzir 🇧🇪 575 577 6ms 18 Dec 2024 308th jared-hughes 571 185 9ms 7 Sep 2023 308th stefangimmillaro 571 185 12ms 30 Sep 2024 310th MeWhenI 🇻🇦 567 154 40ms 1 Sep 2023 311th Argeento 🇵🇱 565 187 9ms 4 Oct 2023 312th sisyphus-ppcg 🇦🇺 564 155 12ms 7 days ago 313th snoozingnewt 🇨🇦 563 280 4,978ms 3 Nov 2025 314th jmerle 🇳🇱 563 760 7ms 1 Sep 2023 315th dokutan 558 767 7ms 12 Jan 2024 315th error256 558 767 7ms 7 Jul 2024 315th KatieLG 🇬🇧 558 767 7ms 31 Jul 2024 315th Shanethegamer 🇺🇸 558 767 9ms 11 May 2025 315th snoozingnewt 🇨🇦 558 767 7ms 3 Oct 2025 320th MeWhenI 🇻🇦 555 186 730ms 15 Sep 2025 First Prev 241–320 of 1,343 Next Last