The Calendar hole will go live in approximately 7 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 c0d3-4-F00d 🇩🇪 261 241 2ms 4 Dec 2023 642nd helbling 🇨🇭 260 242 2ms 25 Jul 2024 643rd Shanethegamer 🇺🇸 259 781 22ms 1 Sep 2023 643rd KatieLG 🇬🇧 259 781 21ms 2 Sep 2023 643rd KatieLG-Transpiler 🇬🇧 259 781 22ms 2 Sep 2023 643rd snoozingnewt 🇨🇦 259 781 23ms 5 Sep 2023 643rd vgamula 🇺🇦 259 781 21ms 6 Sep 2023 643rd HumanoidCPU 259 781 21ms 16 Apr 2024 643rd Mabeloid 🇳🇴 259 781 22ms 21 Sep 2024 643rd dokutan 259 781 22ms 18 Oct 2024 643rd CaedenHarper 🇨🇦 259 781 22ms 22 Jan 2025 652nd ndren 259 782 24ms 20 Jan 2025 653rd Martymoose98 258 244 1ms 30 May 2025 654th JunkIce 258 338 9ms 13 Feb 2025 655th blaztoma 🇱🇹 255 540 372ms 6 Sep 2025 656th 1231234md5 🇨🇳 254 344 17ms 12 Dec 2023 657th Shanethegamer 🇺🇸 253 782 66ms 1 Sep 2023 657th HumanoidCPU 253 782 68ms 27 May 2024 657th dokutan 253 782 66ms 30 Jul 2024 657th Mabeloid 🇳🇴 253 782 66ms 21 Sep 2024 657th CaedenHarper 🇨🇦 253 782 66ms 22 Jan 2025 662nd rak1507 🇬🇧 252 347 49ms 1 Sep 2023 663rd dokutan 251 588 427ms 24 Sep 2025 664th KatieLG 🇬🇧 251 712 3ms 22 Aug 2024 665th KatieLG 🇬🇧 250 792 67ms 2 Sep 2023 666th gigaprofisi 🇺🇸 248 254 2ms 16 Jul 2025 667th KatieLG 🇬🇧 246 430 9ms 5 Oct 2025 668th kallmi28 🇨🇿 244 258 2ms 8 Nov 2023 669th dokutan 244 791 122ms 18 Oct 2024 670th KatieLG-Transpiler 🇬🇧 244 809 615ms 2 Sep 2023 671st MeWhenI 🇻🇦 243 779 8ms 1 Sep 2023 671st Shanethegamer 🇺🇸 243 779 8ms 1 Sep 2023 671st HumanoidCPU 243 779 8ms 16 Apr 2024 671st Mabeloid 🇳🇴 243 779 8ms 21 Sep 2024 671st dokutan 243 779 8ms 18 Oct 2024 671st CaedenHarper 🇨🇦 243 779 8ms 22 Jan 2025 677th Shanethegamer 🇺🇸 243 795 109ms 1 Sep 2023 677th KatieLG 🇬🇧 243 795 114ms 2 Sep 2023 677th KatieLG-Transpiler 🇬🇧 243 795 109ms 2 Sep 2023 677th msbranicky 243 795 111ms 11 Sep 2023 677th HumanoidCPU 243 795 104ms 16 Apr 2024 677th Mabeloid 🇳🇴 243 795 123ms 21 Sep 2024 677th CaedenHarper 🇨🇦 243 795 109ms 21 Jan 2025 684th yzhs 🇩🇪 242 260 1ms 24 Mar 2024 685th msbranicky 242 596 1ms 10 Oct 2023 686th msbranicky 242 637 6ms 1 Sep 2023 687th snoozingnewt 🇨🇦 242 798 105ms 4 Sep 2023 688th LostSyntax21 🇬🇧 241 363 33ms 23 Oct 2025 689th MeWhenI 🇻🇦 241 800 109ms 1 Sep 2023 690th msbranicky 238 625 82ms 1 Sep 2023 691st KatieLG 🇬🇧 237 797 8ms 2 Sep 2023 691st KatieLG-Transpiler 🇬🇧 237 797 8ms 2 Sep 2023 693rd roguh 🇬🇹 235 268 2ms 23 Jan 2024 694th cbrt-x 235 821 109ms 9 Oct 2023 695th bac0id 234 587 356ms 9 Jan 2025 696th msbranicky 234 678 1,676ms 17 Sep 2025 697th annaproxy 233 270 2ms 1 Sep 2023 698th Maximizer02 231 578 6ms 22 Mar 2024 699th msbranicky 231 635 279ms 1 Sep 2023 700th AbhilashaTandon 230 380 17ms 21 Sep 2023 701st Shanethegamer 🇺🇸 229 448 390ms 1 Sep 2023 702nd Shanethegamer 🇺🇸 228 783 2ms 1 Sep 2023 702nd theunofficialcoder 228 783 2ms 21 Jan 2024 702nd Mabeloid 🇳🇴 228 783 3ms 21 Sep 2024 702nd CaedenHarper 🇨🇦 228 783 2ms 22 Jan 2025 706th dokutan 227 569 2ms 6 Jun 2024 707th KatieLG-Transpiler 🇬🇧 227 787 2ms 2 Sep 2023 708th dokutan 226 324 3ms 13 Nov 2024 709th TheZwierzLF 🇵🇱 226 373 2,526ms 17 days ago 710th alphafalfa 226 572 14ms 1 Aug 2025 711th voytxt 🇨🇿 226 609 369ms 4 Nov 2024 712th msbranicky 223 594 83ms 1 Sep 2023 713th msbranicky 223 617 351ms 8 Sep 2023 714th eiburns 221 285 2ms 6 Nov 2023 715th dokutan 221 427 92ms 2 Apr 2024 716th dokutan 221 624 324ms 5 Jun 2024 717th KatieLG-Transpiler 🇬🇧 221 802 2ms 2 Sep 2023 718th msbranicky 218 678 393ms 8 Sep 2023 719th Shanethegamer 🇺🇸 218 775 3ms 1 Sep 2023 719th CaedenHarper 🇨🇦 218 775 3ms 22 Jan 2025 First Prev 641–720 of 1,346 Next Last