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 401st CaedenHarper 🇨🇦 453 193 132ms 14 Aug 2025 402nd MeWhenI 🇻🇦 452 213 145ms 3 Aug 2024 403rd MeWhenI 🇻🇦 451 449 29ms 6 Sep 2023 404th inventshah 450 180 56ms 3 Sep 2023 405th tatzyr 🇯🇵 446 183 51ms 19 Jan 2025 406th gigaprofisi 🇺🇸 446 237 11ms 16 Jul 2025 407th luuumine 🇫🇷 444 236 137ms 22 days ago 408th RaBa21 🇭🇺 443 197 20ms 1 Aug 2025 409th dokutan 442 401 3ms 13 Apr 2024 410th error256 441 303 7ms 20 Jul 2024 411th error256 440 544 16ms 31 May 2024 411th dokutan 440 544 15ms 8 Apr 2025 413th elgan65536 439 239 133ms 7 Apr 2024 413th Aurel300 🇨🇭 439 239 130ms 8 Jun 2024 415th MeWhenI 🇻🇦 436 775 1ms 1 Sep 2023 415th Shanethegamer 🇺🇸 436 775 1ms 1 Sep 2023 415th snoozingnewt 🇨🇦 436 775 1ms 5 Sep 2023 415th DialFrost 🇸🇬 436 775 1ms 7 Sep 2023 415th dokutan 436 775 1ms 10 Sep 2023 415th HumanoidCPU 436 775 1ms 16 Apr 2024 415th weliveinhell 🇭🇹 436 775 1ms 7 Jun 2024 415th Mabeloid 🇳🇴 436 775 1ms 21 Sep 2024 415th CaedenHarper 🇨🇦 436 775 1ms 22 Jan 2025 415th fuzzylojik-golf 🇺🇸 436 775 2ms 8 Jul 2025 415th JOrE20 🇺🇸 436 775 1ms 10 Nov 2025 426th KatieLG-Transpiler 🇬🇧 436 776 1ms 2 Sep 2023 427th weliveinhell 🇭🇹 435 550 15ms 6 Jan 2024 428th Yewzir 🇧🇪 434 317 368ms 17 Oct 2024 429th InigoK 🇺🇸 432 202 153ms 10 Sep 2025 430th emgordon154 431 189 36ms 6 Mar 2025 431st lionbryce 429 288 1ms 7 Aug 2024 432nd HumanoidCPU 429 773 3ms 12 Dec 2024 432nd dokutan 429 773 3ms 12 Dec 2024 432nd KatieLG 🇬🇧 429 773 3ms 3 Jan 2025 432nd Shanethegamer 🇺🇸 429 773 3ms 11 Jan 2025 432nd BREMAUCY 🇫🇷 429 773 3ms 14 Jan 2025 432nd CaedenHarper 🇨🇦 429 773 3ms 22 Jan 2025 432nd JOrE20 🇺🇸 429 773 3ms 17 days ago 439th klixel 🇨🇦 428 204 3,452ms 20 Jul 2025 440th Yewzir 🇧🇪 427 338 2ms 27 Mar 2024 441st inventshah 423 541 3ms 1 Sep 2023 441st IanUtley 423 541 2ms 1 Sep 2023 441st MeWhenI 🇻🇦 423 541 2ms 3 Sep 2023 441st retrohun 423 541 2ms 6 Sep 2023 441st sisyphus-ppcg 🇦🇺 423 541 2ms 21 Sep 2023 441st Steffan153 🇫🇮 423 541 3ms 23 Sep 2023 441st dokutan 423 541 3ms 3 Oct 2023 441st neel11235813 423 541 2ms 22 Oct 2023 441st galloj 🇨🇿 423 541 2ms 24 Nov 2023 441st kritixilithos 423 541 2ms 1 Jun 2024 441st stefangimmillaro 423 541 2ms 14 Jul 2025 452nd msbranicky 423 932 11ms 19 Sep 2023 453rd commandblockguy 🇺🇸 422 212 548ms 1 Sep 2025 454th error256 422 542 2ms 31 May 2024 454th fuzzylojik-golf 🇺🇸 422 542 2ms 8 Jul 2025 456th madex 🇩🇪 421 327 401ms 3 May 2025 457th weliveinhell 🇭🇹 421 543 3ms 6 Jan 2024 458th Kacarott 🇦🇺 419 250 65ms 13 Sep 2024 459th didion0 🇺🇸 419 252 9ms 24 Feb 2025 460th dokutan 417 320 5ms 1 Jul 2024 461st andrewjc2000 416 210 96ms 14 Aug 2025 462nd Natanaelel 🇸🇪 415 465 153ms 9 Jun 2025 463rd MeWhenI 🇻🇦 413 433 2ms 1 Sep 2023 464th typeswitch-dev 🇵🇹 413 571 4ms 1 Sep 2023 465th jerrandolph 412 356 263ms 22 Sep 2025 466th ovs-code 🇩🇪 408 257 63ms 17 Mar 2025 467th StefanHabel 🇨🇦 406 215 117ms 1 Sep 2023 468th Yewzir 🇧🇪 405 330 6ms 4 Apr 2024 469th dokutan 404 323 2ms 15 days ago 470th janbehrens 🇩🇪 403 217 11ms 2 Jan 2024 470th BREMAUCY 🇫🇷 403 217 112ms 24 Aug 2025 472nd JohandeRuiter 🇳🇱 401 157 2ms 29 Sep 2023 473rd weliveinhell 🇭🇹 401 202 63ms 6 Jan 2024 474th Andrey-Plotnikov 400 264 9ms 26 Jun 2025 475th dokutan 400 447 3ms 13 Mar 2025 476th DialFrost 🇸🇬 399 219 111ms 11 Oct 2024 477th tomh1012 399 345 421ms 10 Nov 2025 478th annaproxy 397 220 116ms 4 Oct 2023 479th OllieBoyne 🇬🇧 395 221 10ms 6 Jun 2024 480th dokutan 394 262 750ms 30 Aug 2025 First Prev 401–480 of 1,340 Next Last