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 641st Shanethegamer 🇺🇸 259 781 22ms 1 Sep 2023 641st KatieLG 🇬🇧 259 781 21ms 2 Sep 2023 641st KatieLG-Transpiler 🇬🇧 259 781 22ms 2 Sep 2023 641st snoozingnewt 🇨🇦 259 781 23ms 5 Sep 2023 641st vgamula 🇺🇦 259 781 21ms 6 Sep 2023 641st HumanoidCPU 259 781 21ms 16 Apr 2024 641st Mabeloid 🇳🇴 259 781 22ms 21 Sep 2024 641st dokutan 259 781 22ms 18 Oct 2024 641st CaedenHarper 🇨🇦 259 781 23ms 22 Jan 2025 650th ndren 259 782 24ms 20 Jan 2025 651st Martymoose98 258 244 1ms 30 May 2025 652nd JunkIce 258 338 9ms 13 Feb 2025 653rd blaztoma 🇱🇹 255 540 403ms 6 Sep 2025 654th 1231234md5 🇨🇳 254 344 17ms 12 Dec 2023 655th Shanethegamer 🇺🇸 253 782 66ms 1 Sep 2023 655th HumanoidCPU 253 782 68ms 27 May 2024 655th dokutan 253 782 66ms 30 Jul 2024 655th Mabeloid 🇳🇴 253 782 66ms 21 Sep 2024 655th CaedenHarper 🇨🇦 253 782 67ms 22 Jan 2025 660th rak1507 🇬🇧 252 347 49ms 1 Sep 2023 661st dokutan 251 588 427ms 24 Sep 2025 662nd KatieLG 🇬🇧 251 712 3ms 22 Aug 2024 663rd KatieLG 🇬🇧 250 792 67ms 2 Sep 2023 664th gigaprofisi 🇺🇸 248 254 2ms 16 Jul 2025 665th KatieLG 🇬🇧 246 430 9ms 5 Oct 2025 666th kallmi28 🇨🇿 244 258 2ms 8 Nov 2023 667th dokutan 244 791 122ms 18 Oct 2024 668th KatieLG-Transpiler 🇬🇧 244 809 615ms 2 Sep 2023 669th MeWhenI 🇻🇦 243 779 8ms 1 Sep 2023 669th Shanethegamer 🇺🇸 243 779 8ms 1 Sep 2023 669th HumanoidCPU 243 779 8ms 16 Apr 2024 669th Mabeloid 🇳🇴 243 779 8ms 21 Sep 2024 669th dokutan 243 779 8ms 18 Oct 2024 669th CaedenHarper 🇨🇦 243 779 8ms 22 Jan 2025 675th Shanethegamer 🇺🇸 243 795 109ms 1 Sep 2023 675th KatieLG 🇬🇧 243 795 114ms 2 Sep 2023 675th KatieLG-Transpiler 🇬🇧 243 795 109ms 2 Sep 2023 675th msbranicky 243 795 111ms 11 Sep 2023 675th HumanoidCPU 243 795 104ms 16 Apr 2024 675th Mabeloid 🇳🇴 243 795 123ms 21 Sep 2024 675th CaedenHarper 🇨🇦 243 795 109ms 21 Jan 2025 682nd yzhs 🇩🇪 242 260 1ms 24 Mar 2024 683rd msbranicky 242 596 1ms 10 Oct 2023 684th msbranicky 242 637 6ms 1 Sep 2023 685th snoozingnewt 🇨🇦 242 798 105ms 4 Sep 2023 686th LostSyntax21 🇬🇧 241 363 33ms 23 Oct 2025 687th MeWhenI 🇻🇦 241 800 109ms 1 Sep 2023 688th msbranicky 238 625 82ms 1 Sep 2023 689th msbranicky 238 678 1,676ms 17 Sep 2025 690th KatieLG 🇬🇧 237 797 8ms 2 Sep 2023 690th KatieLG-Transpiler 🇬🇧 237 797 8ms 2 Sep 2023 692nd roguh 🇬🇹 235 268 2ms 23 Jan 2024 693rd cbrt-x 235 821 109ms 9 Oct 2023 694th bac0id 234 587 356ms 9 Jan 2025 695th annaproxy 233 270 2ms 1 Sep 2023 696th Maximizer02 231 578 6ms 22 Mar 2024 697th msbranicky 231 635 279ms 1 Sep 2023 698th AbhilashaTandon 230 380 17ms 21 Sep 2023 699th Shanethegamer 🇺🇸 229 448 411ms 1 Sep 2023 700th Shanethegamer 🇺🇸 228 783 2ms 1 Sep 2023 700th theunofficialcoder 228 783 2ms 21 Jan 2024 700th Mabeloid 🇳🇴 228 783 3ms 21 Sep 2024 700th CaedenHarper 🇨🇦 228 783 2ms 22 Jan 2025 704th KatieLG-Transpiler 🇬🇧 227 787 2ms 2 Sep 2023 705th dokutan 226 324 3ms 13 Nov 2024 706th TheZwierzLF 🇵🇱 226 373 2,526ms 12 days ago 707th voytxt 🇨🇿 226 609 369ms 4 Nov 2024 708th msbranicky 223 594 83ms 1 Sep 2023 709th msbranicky 223 617 351ms 8 Sep 2023 710th eiburns 221 285 2ms 6 Nov 2023 711th dokutan 221 427 92ms 2 Apr 2024 712th KatieLG-Transpiler 🇬🇧 221 802 2ms 2 Sep 2023 713th dokutan 220 624 324ms 5 Jun 2024 714th msbranicky 218 678 393ms 8 Sep 2023 715th Shanethegamer 🇺🇸 218 775 3ms 1 Sep 2023 715th CaedenHarper 🇨🇦 218 775 3ms 22 Jan 2025 717th HumanoidCPU 218 820 2ms 16 Apr 2024 718th msbranicky 217 614 6ms 24 Dec 2023 719th MeWhenI 🇻🇦 217 776 3ms 1 Sep 2023 719th KatieLG-Transpiler 🇬🇧 217 776 4ms 2 Sep 2023 First Prev 641–720 of 1,341 Next Last