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 560th hacker112 🇸🇪 304 348 9ms 22 Jun 2024 562nd msbranicky 303 591 2ms 1 Sep 2023 563rd bobbysq 300 291 10ms 20 May 2024 564th dokutan 299 788 4ms 1 Aug 2024 564th Shanethegamer 🇺🇸 299 788 3ms 6 Dec 2024 564th CaedenHarper 🇨🇦 299 788 3ms 20 Jan 2025 564th BREMAUCY 🇫🇷 299 788 3ms 13 Aug 2025 564th fuzzylojik-golf 🇺🇸 299 788 3ms 7 Sep 2025 569th Natanaelel 🇸🇪 297 212 1ms 4 Sep 2023 569th iczelia 🇩🇪 297 212 1ms 17 Oct 2025 571st brimstonetrader 297 294 97ms 10 Jan 2024 572nd dokutan 295 489 2ms 21 Jun 2025 573rd MateuszPietrzak 🇵🇱 294 286 2,512ms 17 Jan 2024 574th CaedenHarper 🇨🇦 293 215 3ms 30 Jan 2025 575th KatieLG 🇬🇧 292 783 1ms 2 Sep 2023 575th snoozingnewt 🇨🇦 292 783 1ms 7 Sep 2023 575th Shanethegamer 🇺🇸 292 783 1ms 16 Jan 2024 575th HumanoidCPU 292 783 1ms 16 Apr 2024 575th CaedenHarper 🇨🇦 292 783 1ms 22 Jan 2025 580th KatieLG-Transpiler 🇬🇧 292 784 1ms 2 Sep 2023 580th Mabeloid 🇳🇴 292 784 1ms 21 Sep 2024 582nd msbranicky 291 785 1ms 20 Sep 2023 583rd logvp 289 218 1ms 1 Feb 2024 584th Stanbroek 289 291 67ms 18 Sep 2023 585th dokutan 289 354 433ms 20 Mar 2025 586th Yewzir 🇧🇪 288 219 2ms 7 Nov 2023 587th HumanoidCPU 288 311 359ms 12 Nov 2025 588th Shanethegamer 🇺🇸 287 788 98ms 20 days ago 589th HumanoidCPU 286 790 103ms 4 Aug 2025 590th janbehrens 🇩🇪 284 222 1ms 30 Dec 2023 591st rifatx 283 223 1ms 16 Jul 2024 592nd snoozingnewt 🇨🇦 281 224 1ms 4 Nov 2025 593rd hellwue 281 311 17ms 10 Sep 2024 593rd HumanoidCPU 281 311 10ms 12 Nov 2025 595th KatieLG 🇬🇧 281 805 111ms 20 Apr 2025 595th CaedenHarper 🇨🇦 281 805 103ms 22 days ago 597th MeWhenI 🇻🇦 280 773 13ms 1 Sep 2023 597th Shanethegamer 🇺🇸 280 773 13ms 1 Sep 2023 597th snoozingnewt 🇨🇦 280 773 13ms 2 Sep 2023 597th msbranicky 280 773 13ms 13 Sep 2023 597th theunofficialcoder 280 773 13ms 7 Jan 2024 597th KatieLG 🇬🇧 280 773 14ms 17 Mar 2024 597th HumanoidCPU 280 773 13ms 16 Apr 2024 597th Mabeloid 🇳🇴 280 773 13ms 21 Sep 2024 597th CaedenHarper 🇨🇦 280 773 13ms 22 Jan 2025 597th JunkIce 280 773 13ms 24 Jan 2025 607th codereport 🇨🇦 279 226 2ms 18 Apr 2025 608th robin-scragg 279 313 17ms 6 Jun 2025 609th gastropner 278 227 1ms 17 Jul 2025 610th crizin 🇰🇷 277 534 374ms 15 Sep 2023 611th dokutan 276 572 3,057ms 24 Oct 2024 612th Jacob385 275 538 427ms 4 Aug 2024 613th theunofficialcoder 273 862 3ms 21 Jan 2024 613th plcc0 273 862 3ms 10 Apr 2025 613th HumanoidCPU 273 862 3ms 4 Aug 2025 616th Mabeloid 🇳🇴 272 232 2ms 15 Oct 2025 617th aksyristos 272 321 13ms 11 Sep 2023 618th MeWhenI 🇻🇦 272 866 3ms 1 Sep 2023 619th KatieLG 🇬🇧 272 867 3ms 2 Sep 2023 619th KatieLG-Transpiler 🇬🇧 272 867 3ms 2 Sep 2023 621st dokutan 271 495 7ms 10 Apr 2025 622nd msbranicky 269 626 3ms 12 Sep 2023 623rd plcc0 268 326 9ms 10 Apr 2025 624th Yewzir 🇧🇪 268 593 2,585ms 14 Nov 2025 625th bac0id 267 236 2ms 8 Jan 2025 626th dokutan 267 305 34ms 13 Mar 2025 627th msbranicky 267 590 3,272ms 11 Jan 2025 628th InigoK 🇺🇸 267 883 3ms 6 Aug 2025 629th trinityy-7 266 237 1ms 10 Oct 2023 630th JunkIce 265 338 536ms 13 Feb 2025 631st KatieLG 🇬🇧 265 769 3ms 11 Aug 2024 631st Shanethegamer 🇺🇸 265 769 3ms 11 Aug 2024 631st HumanoidCPU 265 769 3ms 13 Aug 2024 631st KatieLG-Transpiler 🇬🇧 265 769 3ms 16 Aug 2024 631st Mabeloid 🇳🇴 265 769 4ms 21 Sep 2024 631st CaedenHarper 🇨🇦 265 769 3ms 22 Jan 2025 631st snoozingnewt 🇨🇦 265 769 5ms 28 Sep 2025 638th tomtheisen 🇺🇸 264 521 357ms 13 Feb 2025 639th peachey2k2 262 240 3ms 22 Nov 2025 640th msbranicky 262 638 110ms 1 Sep 2023 First Prev 561–640 of 1,346 Next Last