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 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 641st MeWhenI 🇻🇦 270 866 3ms 1 Sep 2023 642nd KatieLG 🇬🇧 270 867 3ms 2 Sep 2023 642nd KatieLG-Transpiler 🇬🇧 270 867 3ms 2 Sep 2023 644th plcc0 269 454 9ms 10 Apr 2025 645th rucin93 🇵🇱 267 458 37ms 12 Oct 2023 646th msbranicky 267 626 3ms 12 Sep 2023 647th HumanoidCPU 265 820 2ms 16 Apr 2024 648th InigoK 🇺🇸 265 883 3ms 6 Aug 2025 649th msbranicky 264 590 4,210ms 11 Jan 2025 650th KatieLG 🇬🇧 263 769 3ms 11 Aug 2024 650th Shanethegamer 🇺🇸 263 769 3ms 11 Aug 2024 650th HumanoidCPU 263 769 3ms 13 Aug 2024 650th KatieLG-Transpiler 🇬🇧 263 769 3ms 16 Aug 2024 650th Mabeloid 🇳🇴 263 769 4ms 21 Sep 2024 650th CaedenHarper 🇨🇦 263 769 3ms 22 Jan 2025 650th snoozingnewt 🇨🇦 263 769 5ms 28 Sep 2025 657th eiburns 262 285 2ms 6 Nov 2023 658th tomtheisen 🇺🇸 262 521 357ms 13 Feb 2025 659th msbranicky 260 638 110ms 1 Sep 2023 660th TheZwierzLF 🇵🇱 258 373 2,526ms 11 days ago 661st Stockoh 🇫🇷 258 474 14ms 30 Sep 2024 662nd Yewzir 🇧🇪 258 619 2,614ms 28 Apr 2024 663rd Stanbroek 257 291 2ms 18 Sep 2023 664th dokutan 257 570 1ms 6 Mar 2024 665th Shanethegamer 🇺🇸 257 781 22ms 1 Sep 2023 665th KatieLG 🇬🇧 257 781 21ms 2 Sep 2023 665th KatieLG-Transpiler 🇬🇧 257 781 22ms 2 Sep 2023 665th snoozingnewt 🇨🇦 257 781 23ms 5 Sep 2023 665th vgamula 🇺🇦 257 781 21ms 6 Sep 2023 665th HumanoidCPU 257 781 21ms 16 Apr 2024 665th Mabeloid 🇳🇴 257 781 22ms 21 Sep 2024 665th dokutan 257 781 22ms 18 Oct 2024 665th CaedenHarper 🇨🇦 257 781 23ms 22 Jan 2025 674th ndren 257 782 24ms 20 Jan 2025 675th robin-scragg 255 479 492ms 23 Oct 2025 676th blaztoma 🇱🇹 253 540 403ms 6 Sep 2025 677th MeWhenI 🇻🇦 253 774 2ms 1 Sep 2023 677th Shanethegamer 🇺🇸 253 774 2ms 1 Sep 2023 677th KatieLG 🇬🇧 253 774 2ms 2 Sep 2023 677th KatieLG-Transpiler 🇬🇧 253 774 3ms 2 Sep 2023 677th snoozingnewt 🇨🇦 253 774 2ms 11 Oct 2023 677th theunofficialcoder 253 774 2ms 7 Jan 2024 677th HumanoidCPU 253 774 3ms 16 Apr 2024 677th Mabeloid 🇳🇴 253 774 2ms 21 Sep 2024 677th xyangst 253 774 3ms 12 Oct 2024 677th CaedenHarper 🇨🇦 253 774 3ms 22 Jan 2025 677th ehulinsky 🇺🇸 253 774 2ms 26 Mar 2025 688th Shanethegamer 🇺🇸 251 782 66ms 1 Sep 2023 688th HumanoidCPU 251 782 68ms 27 May 2024 688th dokutan 251 782 66ms 30 Jul 2024 688th Mabeloid 🇳🇴 251 782 66ms 21 Sep 2024 688th CaedenHarper 🇨🇦 251 782 67ms 22 Jan 2025 693rd dokutan 249 588 427ms 24 Sep 2025 694th AbhilashaTandon 248 492 11ms 21 Sep 2023 695th msbranicky 248 590 2ms 28 Sep 2023 696th KatieLG 🇬🇧 248 776 5ms 11 Dec 2023 696th Shanethegamer 🇺🇸 248 776 6ms 11 Dec 2023 696th MeWhenI 🇻🇦 248 776 5ms 13 Dec 2023 696th theunofficialcoder 248 776 5ms 12 Jan 2024 696th HumanoidCPU 248 776 5ms 16 Apr 2024 696th KatieLG-Transpiler 🇬🇧 248 776 5ms 16 Aug 2024 696th Mabeloid 🇳🇴 248 776 4ms 21 Sep 2024 696th CaedenHarper 🇨🇦 248 776 8ms 20 Jan 2025 696th Babafaba 248 776 7ms 29 Oct 2025 705th Yewzir 🇧🇪 247 578 2ms 27 Mar 2024 706th KatieLG 🇬🇧 247 792 67ms 2 Sep 2023 707th fgrosshans 🇫🇷 245 498 16ms 1 Sep 2023 708th neihousaigaai 243 502 9ms 12 Feb 2024 709th dokutan 242 791 122ms 18 Oct 2024 710th KatieLG-Transpiler 🇬🇧 242 809 615ms 2 Sep 2023 711th MeWhenI 🇻🇦 241 779 8ms 1 Sep 2023 711th Shanethegamer 🇺🇸 241 779 8ms 1 Sep 2023 711th HumanoidCPU 241 779 8ms 16 Apr 2024 711th Mabeloid 🇳🇴 241 779 8ms 21 Sep 2024 711th dokutan 241 779 8ms 18 Oct 2024 711th CaedenHarper 🇨🇦 241 779 8ms 22 Jan 2025 717th Shanethegamer 🇺🇸 241 795 109ms 1 Sep 2023 717th KatieLG 🇬🇧 241 795 114ms 2 Sep 2023 717th KatieLG-Transpiler 🇬🇧 241 795 109ms 2 Sep 2023 717th msbranicky 241 795 111ms 11 Sep 2023 First Prev 641–720 of 1,367 Next Last