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 bytes. 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 Bytes Time Submitted 639th HumanoidCPU 271 862 3ms 4 Aug 2025 642nd MeWhenI 🇻🇦 270 866 3ms 1 Sep 2023 643rd KatieLG 🇬🇧 270 867 3ms 2 Sep 2023 643rd KatieLG-Transpiler 🇬🇧 270 867 3ms 2 Sep 2023 645th plcc0 269 454 9ms 10 Apr 2025 646th rucin93 🇵🇱 267 458 37ms 12 Oct 2023 647th msbranicky 267 626 3ms 12 Sep 2023 648th HumanoidCPU 265 820 2ms 16 Apr 2024 649th InigoK 🇺🇸 265 883 3ms 6 Aug 2025 650th msbranicky 264 590 4,210ms 11 Jan 2025 651st KatieLG 🇬🇧 263 769 3ms 11 Aug 2024 651st Shanethegamer 🇺🇸 263 769 3ms 11 Aug 2024 651st HumanoidCPU 263 769 3ms 13 Aug 2024 651st KatieLG-Transpiler 🇬🇧 263 769 3ms 16 Aug 2024 651st Mabeloid 🇳🇴 263 769 4ms 21 Sep 2024 651st CaedenHarper 🇨🇦 263 769 3ms 22 Jan 2025 651st snoozingnewt 🇨🇦 263 769 5ms 28 Sep 2025 658th eiburns 262 285 2ms 6 Nov 2023 659th tomtheisen 🇺🇸 262 521 357ms 13 Feb 2025 660th msbranicky 260 638 110ms 1 Sep 2023 661st TheZwierzLF 🇵🇱 258 373 2,526ms 12 days ago 662nd Stockoh 🇫🇷 258 474 14ms 30 Sep 2024 663rd Yewzir 🇧🇪 258 619 2,614ms 28 Apr 2024 664th Stanbroek 257 291 2ms 18 Sep 2023 665th dokutan 257 570 1ms 6 Mar 2024 666th Shanethegamer 🇺🇸 257 781 22ms 1 Sep 2023 666th KatieLG 🇬🇧 257 781 21ms 2 Sep 2023 666th KatieLG-Transpiler 🇬🇧 257 781 22ms 2 Sep 2023 666th snoozingnewt 🇨🇦 257 781 23ms 5 Sep 2023 666th vgamula 🇺🇦 257 781 21ms 6 Sep 2023 666th HumanoidCPU 257 781 21ms 16 Apr 2024 666th Mabeloid 🇳🇴 257 781 22ms 21 Sep 2024 666th dokutan 257 781 22ms 18 Oct 2024 666th CaedenHarper 🇨🇦 257 781 23ms 22 Jan 2025 675th ndren 257 782 24ms 20 Jan 2025 676th robin-scragg 255 479 492ms 23 Oct 2025 677th blaztoma 🇱🇹 253 540 403ms 6 Sep 2025 678th MeWhenI 🇻🇦 253 774 2ms 1 Sep 2023 678th Shanethegamer 🇺🇸 253 774 2ms 1 Sep 2023 678th KatieLG 🇬🇧 253 774 2ms 2 Sep 2023 678th KatieLG-Transpiler 🇬🇧 253 774 3ms 2 Sep 2023 678th snoozingnewt 🇨🇦 253 774 2ms 11 Oct 2023 678th theunofficialcoder 253 774 2ms 7 Jan 2024 678th HumanoidCPU 253 774 3ms 16 Apr 2024 678th Mabeloid 🇳🇴 253 774 2ms 21 Sep 2024 678th xyangst 253 774 3ms 12 Oct 2024 678th CaedenHarper 🇨🇦 253 774 3ms 22 Jan 2025 678th ehulinsky 🇺🇸 253 774 2ms 26 Mar 2025 689th Shanethegamer 🇺🇸 251 782 66ms 1 Sep 2023 689th HumanoidCPU 251 782 68ms 27 May 2024 689th dokutan 251 782 66ms 30 Jul 2024 689th Mabeloid 🇳🇴 251 782 66ms 21 Sep 2024 689th CaedenHarper 🇨🇦 251 782 67ms 22 Jan 2025 694th dokutan 249 588 427ms 24 Sep 2025 695th AbhilashaTandon 248 492 11ms 21 Sep 2023 696th msbranicky 248 590 2ms 28 Sep 2023 697th KatieLG 🇬🇧 248 776 5ms 11 Dec 2023 697th Shanethegamer 🇺🇸 248 776 6ms 11 Dec 2023 697th MeWhenI 🇻🇦 248 776 5ms 13 Dec 2023 697th theunofficialcoder 248 776 5ms 12 Jan 2024 697th HumanoidCPU 248 776 5ms 16 Apr 2024 697th KatieLG-Transpiler 🇬🇧 248 776 5ms 16 Aug 2024 697th Mabeloid 🇳🇴 248 776 4ms 21 Sep 2024 697th CaedenHarper 🇨🇦 248 776 8ms 20 Jan 2025 697th Babafaba 248 776 7ms 29 Oct 2025 706th Yewzir 🇧🇪 247 578 2ms 27 Mar 2024 707th KatieLG 🇬🇧 247 792 67ms 2 Sep 2023 708th fgrosshans 🇫🇷 245 498 16ms 1 Sep 2023 709th neihousaigaai 243 502 9ms 12 Feb 2024 710th dokutan 242 791 122ms 18 Oct 2024 711th KatieLG-Transpiler 🇬🇧 242 809 615ms 2 Sep 2023 712th MeWhenI 🇻🇦 241 779 8ms 1 Sep 2023 712th Shanethegamer 🇺🇸 241 779 8ms 1 Sep 2023 712th HumanoidCPU 241 779 8ms 16 Apr 2024 712th Mabeloid 🇳🇴 241 779 8ms 21 Sep 2024 712th dokutan 241 779 8ms 18 Oct 2024 712th CaedenHarper 🇨🇦 241 779 8ms 22 Jan 2025 718th Shanethegamer 🇺🇸 241 795 109ms 1 Sep 2023 718th KatieLG 🇬🇧 241 795 114ms 2 Sep 2023 718th KatieLG-Transpiler 🇬🇧 241 795 109ms 2 Sep 2023 First Prev 641–720 of 1,368 Next Last