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 561st snoozingnewt 🇨🇦 334 224 1ms 4 Nov 2025 562nd Maximizer02 332 578 6ms 22 Mar 2024 563rd codereport 🇨🇦 331 226 2ms 18 Apr 2025 564th Stanbroek 330 291 73ms 18 Sep 2023 565th gastropner 329 227 1ms 17 Jul 2025 566th dokutan 327 665 2ms 12 Mar 2025 567th KatieLG 🇬🇧 325 783 1ms 2 Sep 2023 567th snoozingnewt 🇨🇦 325 783 1ms 7 Sep 2023 567th Shanethegamer 🇺🇸 325 783 1ms 16 Jan 2024 567th HumanoidCPU 325 783 1ms 16 Apr 2024 567th CaedenHarper 🇨🇦 325 783 1ms 22 Jan 2025 572nd KatieLG-Transpiler 🇬🇧 324 784 1ms 2 Sep 2023 572nd Mabeloid 🇳🇴 324 784 1ms 21 Sep 2024 574th msbranicky 324 785 1ms 20 Sep 2023 575th frankgraziano 323 318 4,993ms 11 Apr 2025 576th Mabeloid 🇳🇴 322 232 2ms 15 Oct 2025 577th msbranicky 322 609 84ms 13 Sep 2023 578th msbranicky 322 623 27ms 21 Sep 2023 579th bac0id 317 236 2ms 8 Jan 2025 580th trinityy-7 315 237 1ms 10 Oct 2023 581st TheEric0802 🇩🇪 314 622 3ms 22 Sep 2023 582nd msbranicky 313 614 6ms 24 Dec 2023 583rd peachey2k2 311 240 3ms 25 days ago 584th c0d3-4-F00d 🇩🇪 310 241 2ms 4 Dec 2023 585th helbling 🇨🇭 309 242 2ms 25 Jul 2024 586th MeWhenI 🇻🇦 307 773 13ms 1 Sep 2023 586th Shanethegamer 🇺🇸 307 773 13ms 1 Sep 2023 586th snoozingnewt 🇨🇦 307 773 13ms 2 Sep 2023 586th msbranicky 307 773 13ms 13 Sep 2023 586th theunofficialcoder 307 773 13ms 7 Jan 2024 586th KatieLG 🇬🇧 307 773 14ms 17 Mar 2024 586th HumanoidCPU 307 773 13ms 16 Apr 2024 586th Mabeloid 🇳🇴 307 773 13ms 21 Sep 2024 586th CaedenHarper 🇨🇦 307 773 13ms 22 Jan 2025 586th JunkIce 307 773 13ms 24 Jan 2025 596th Martymoose98 306 244 1ms 30 May 2025 597th KatieLG 🇬🇧 306 712 3ms 22 Aug 2024 598th dokutan 297 788 4ms 1 Aug 2024 598th Shanethegamer 🇺🇸 297 788 3ms 6 Dec 2024 598th CaedenHarper 🇨🇦 297 788 3ms 20 Jan 2025 598th BREMAUCY 🇫🇷 297 788 3ms 13 Aug 2025 598th fuzzylojik-golf 🇺🇸 297 788 3ms 7 Sep 2025 603rd gigaprofisi 🇺🇸 294 254 2ms 16 Jul 2025 604th Shanethegamer 🇺🇸 294 776 70ms 1 Sep 2023 604th MeWhenI 🇻🇦 294 776 81ms 1 Sep 2023 604th KatieLG 🇬🇧 294 776 64ms 2 Sep 2023 604th KatieLG-Transpiler 🇬🇧 294 776 68ms 2 Sep 2023 604th snoozingnewt 🇨🇦 294 776 67ms 11 Oct 2023 604th HumanoidCPU 294 776 70ms 16 Apr 2024 604th Mabeloid 🇳🇴 294 776 68ms 21 Sep 2024 604th CaedenHarper 🇨🇦 294 776 65ms 20 Jan 2025 604th gigaprofisi 🇺🇸 294 776 64ms 13 Nov 2025 613th tatzyr 🇯🇵 291 367 52ms 11 Feb 2025 614th Emutis 🇱🇹 291 420 16ms 5 Oct 2025 615th kallmi28 🇨🇿 290 258 2ms 8 Nov 2023 616th msbranicky 288 637 6ms 1 Sep 2023 617th Shanethegamer 🇺🇸 288 788 98ms 14 days ago 618th yzhs 🇩🇪 287 260 1ms 24 Mar 2024 619th HumanoidCPU 287 790 103ms 4 Aug 2025 620th dokutan 285 1,780 5ms 6 Dec 2023 621st neel11235813 285 1,783 5ms 20 Nov 2023 622nd KatieLG 🇬🇧 282 805 111ms 20 Apr 2025 622nd CaedenHarper 🇨🇦 282 805 103ms 16 days ago 624th dranjohn 280 437 10ms 11 Sep 2023 625th roguh 🇬🇹 279 268 2ms 23 Jan 2024 626th Shanethegamer 🇺🇸 278 783 2ms 1 Sep 2023 626th theunofficialcoder 278 783 2ms 21 Jan 2024 626th Mabeloid 🇳🇴 278 783 3ms 21 Sep 2024 626th CaedenHarper 🇨🇦 278 783 2ms 22 Jan 2025 630th annaproxy 277 270 2ms 1 Sep 2023 631st KatieLG-Transpiler 🇬🇧 277 787 2ms 2 Sep 2023 632nd crizin 🇰🇷 274 534 374ms 15 Sep 2023 633rd Shanethegamer 🇺🇸 273 448 411ms 1 Sep 2023 634th dokutan 273 569 2ms 6 Jun 2024 635th dokutan 273 572 3,281ms 24 Oct 2024 636th CaedenHarper 🇨🇦 273 1,862 5ms 17 Aug 2025 637th alphafalfa 272 572 14ms 1 Aug 2025 638th theunofficialcoder 271 862 3ms 21 Jan 2024 638th plcc0 271 862 3ms 10 Apr 2025 638th HumanoidCPU 271 862 3ms 4 Aug 2025 First Prev 561–640 of 1,367 Next Last