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 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 321st bricknellj 549 159 163ms 23 Apr 2025 322nd tobeannouncd 548 352 135ms 20 Dec 2024 323rd MeWhenI 🇻🇦 547 782 7ms 1 Sep 2023 323rd msbranicky 547 782 7ms 15 Sep 2023 323rd KatieLG-Transpiler 🇬🇧 547 782 7ms 18 Nov 2023 323rd HumanoidCPU 547 782 7ms 28 May 2024 323rd Mabeloid 🇳🇴 547 782 7ms 21 Sep 2024 323rd CaedenHarper 🇨🇦 547 782 7ms 22 Jan 2025 329th ryyyn 🇺🇸 546 160 23ms 7 days ago 330th MeWhenI 🇻🇦 546 296 1,750ms 7 Nov 2025 331st SirBogman 🇺🇸 543 116 2ms 11 Jan 2024 332nd MeWhenI 🇻🇦 542 195 10ms 3 Aug 2024 333rd arcpolaris 540 255 386ms 9 Nov 2025 334th weliveinhell 🇭🇹 539 196 9ms 6 Jan 2024 335th h3ra993huskp 🇯🇵 536 276 648ms 18 days ago 336th roavin 535 257 338ms 18 Oct 2023 336th janbehrens 🇩🇪 535 257 344ms 30 Dec 2023 336th rifatx 535 257 354ms 21 Jul 2024 339th weliveinhell 🇭🇹 534 118 2ms 16 Jan 2024 340th KrausRaus 🇺🇸 533 198 8ms 27 Sep 2023 341st stefangimmillaro 532 161 1,088ms 13 Nov 2023 342nd trinityy-7 530 334 3ms 9 Feb 2024 343rd error256 529 119 1ms 27 May 2024 344th CaedenHarper 🇨🇦 528 200 12ms 7 Sep 2025 345th weliveinhell 🇭🇹 527 278 276ms 7 Jan 2024 346th uttumuttu 🇫🇮 526 201 9ms 4 Sep 2023 347th ovs-code 🇩🇪 521 121 1ms 18 Apr 2025 348th KatieLG 🇬🇧 520 802 477ms 7 Jun 2025 349th rak1507 🇬🇧 518 141 3ms 1 Sep 2023 350th stefangimmillaro 516 158 1,664ms 9 Sep 2023 351st Shanethegamer 🇺🇸 516 809 508ms 13 Jan 2025 351st GolfingSuccess 🇬🇷 516 809 468ms 13 Jan 2025 351st HumanoidCPU 516 809 460ms 13 Jan 2025 351st CaedenHarper 🇨🇦 516 809 477ms 21 Jan 2025 351st MeWhenI 🇻🇦 516 809 463ms 10 Feb 2025 356th snoozingnewt 🇨🇦 515 810 488ms 25 Sep 2025 357th blaztoma 🇱🇹 514 170 44ms 13 Nov 2025 358th KrausRaus 🇺🇸 514 281 2ms 26 Oct 2023 359th lukechampine 513 286 256ms 7 Jun 2025 360th jared-hughes 502 174 10ms 5 Sep 2023 361st GrayJoKing 🇦🇺 502 209 75ms 13 Sep 2024 362nd janbehrens 🇩🇪 501 295 402ms 30 Dec 2023 363rd emgordon154 499 276 387ms 20 Oct 2024 364th stefangimmillaro 495 212 131ms 24 Oct 2023 365th annaproxy 491 280 351ms 24 Sep 2023 366th olleicua 🇺🇸 491 872 7ms 28 Mar 2024 367th FlorianCassayre 🇫🇷 488 303 413ms 2 Sep 2023 368th MeWhenI 🇻🇦 488 808 10ms 1 Sep 2023 368th snoozingnewt 🇨🇦 488 808 10ms 2 Sep 2023 368th BREMAUCY 🇫🇷 488 808 10ms 5 Sep 2023 368th DialFrost 🇸🇬 488 808 11ms 7 Sep 2023 368th dokutan 488 808 10ms 21 Jan 2024 368th HumanoidCPU 488 808 12ms 27 May 2024 368th KatieLG 🇬🇧 488 808 10ms 27 Sep 2024 368th emgordon154 488 808 10ms 17 Oct 2024 368th CaedenHarper 🇨🇦 488 808 10ms 24 Jan 2025 368th Shanethegamer 🇺🇸 488 808 10ms 21 Apr 2025 378th BambooleanLogic 🇸🇪 485 218 10ms 17 Sep 2023 378th janbehrens 🇩🇪 485 218 9ms 30 Dec 2023 380th Natanaelel 🇸🇪 484 177 984ms 1 Sep 2023 381st blaztoma 🇱🇹 483 169 54ms 19 Oct 2025 382nd postie77 483 285 369ms 6 Sep 2023 383rd GolfingSuccess 🇬🇷 482 154 65ms 1 Sep 2023 384th eranws 482 219 8ms 3 Sep 2023 385th Mabeloid 🇳🇴 479 187 737ms 17 Sep 2024 386th guilhem-roy 🇫🇷 477 183 9ms 10 Jul 2024 387th dokutan 476 429 3ms 19 Aug 2024 388th rucin93 🇵🇱 475 203 141ms 3 Aug 2024 389th snoozingnewt 🇨🇦 474 314 67ms 14 Oct 2025 390th KatieLG-Transpiler 🇬🇧 471 838 10ms 2 Sep 2023 391st dokutan 468 318 65ms 5 days ago 392nd stefangimmillaro 467 187 2,919ms 9 Sep 2023 392nd Mabeloid 🇳🇴 467 187 13ms 17 Sep 2024 392nd FortuiteMan 🇫🇷 467 187 9ms 21 days ago 392nd Lv0Sys 🇵🇱 467 187 11ms 9 days ago 396th adamnielson42 🇺🇸 465 381 131ms 20 Dec 2023 397th CaedenHarper 🇨🇦 464 193 528ms 14 Aug 2025 398th helbling 🇨🇭 463 228 9ms 25 Jul 2024 399th Natanaelel 🇸🇪 461 162 35ms 28 Nov 2023 400th dokutan 460 269 2ms 28 Mar 2025 First Prev 321–400 of 1,340 Next Last