The Calendar hole will go live in approximately 8 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 795th gigaprofisi 🇺🇸 184 777 40ms 5 Nov 2025 802nd MichalMarsalek 🇨🇿 184 1,177 5ms 1 Sep 2023 803rd retrohun 183 570 55ms 6 Sep 2023 804th alexsave 183 577 9ms 4 Nov 2025 805th KatieLG 🇬🇧 183 791 1ms 8 Oct 2023 805th snoozingnewt 🇨🇦 183 791 2ms 12 Nov 2025 805th CaedenHarper 🇨🇦 183 791 1ms 12 Nov 2025 805th Shanethegamer 🇺🇸 183 791 1ms 12 Nov 2025 805th HumanoidCPU 183 791 1ms 12 Nov 2025 805th gigaprofisi 🇺🇸 183 791 1ms 13 Nov 2025 811th Schmitt-Very-Cool 183 808 457ms 3 Oct 2025 811th gigaprofisi 🇺🇸 183 808 418ms 5 Nov 2025 813th TheZwierzLF 🇵🇱 182 346 2ms 27 days ago 814th dokutan 182 457 222ms 14 Apr 2025 815th KatieLG-Transpiler 🇬🇧 182 795 2ms 8 Oct 2023 816th KatieLG 🇬🇧 181 815 522ms 24 Sep 2025 817th MeWhenI 🇻🇦 180 815 276ms 1 Sep 2023 817th Shanethegamer 🇺🇸 180 815 352ms 13 Sep 2023 817th KatieLG 🇬🇧 180 815 262ms 23 Mar 2024 817th HumanoidCPU 180 815 266ms 26 Aug 2024 821st msbranicky 179 571 185ms 15 Jan 2024 822nd gifti258 179 585 189ms 13 Sep 2023 823rd iczelia 🇩🇪 179 591 8ms 8 Nov 2025 824th dokutan 179 666 271ms 21 Jun 2025 825th KatieLG-Transpiler 🇬🇧 178 822 270ms 2 Sep 2023 826th olleicua 🇺🇸 177 460 38ms 11 Apr 2024 827th ndren 176 598 3ms 2 Sep 2023 828th msbranicky 176 601 8ms 8 Sep 2023 829th kkoenig 176 834 257ms 3 Jan 2024 830th Mabeloid 🇳🇴 176 835 260ms 21 Sep 2024 831st MarcMush 🇫🇷 175 360 2ms 7 Jan 2024 832nd Shanethegamer 🇺🇸 175 786 349ms 1 Sep 2023 832nd MeWhenI 🇻🇦 175 786 308ms 1 Sep 2023 832nd Maximizer02 175 786 312ms 12 Mar 2024 832nd KatieLG 🇬🇧 175 786 321ms 5 May 2024 832nd Jacob385 175 786 317ms 18 Mar 2025 832nd fuzzylojik-golf 🇺🇸 175 786 374ms 7 Sep 2025 832nd Babafaba 175 786 379ms 30 Oct 2025 832nd HumanoidCPU 175 786 359ms 9 Nov 2025 840th rollershutter 175 847 346ms 29 Jan 2025 841st neihousaigaai 174 502 9ms 12 Feb 2024 842nd Shanethegamer 🇺🇸 174 771 5ms 8 May 2025 842nd fuzzylojik-golf 🇺🇸 174 771 5ms 8 Jul 2025 844th Adix-null 🇱🇹 174 790 355ms 10 Dec 2024 844th rollershutter 174 790 327ms 29 Jan 2025 844th heanyang1 174 790 355ms 23 May 2025 844th KasperKivimaeki 🇫🇮 174 790 337ms 2 Jul 2025 844th Blockyheadman 174 790 366ms 6 Nov 2025 849th MeWhenI 🇻🇦 173 773 6ms 1 Sep 2023 849th josh-h-90 173 773 7ms 8 Sep 2023 849th msbranicky 173 773 6ms 17 Sep 2023 849th snoozingnewt 🇨🇦 173 773 6ms 17 Sep 2023 849th satutalo 🇫🇮 173 773 7ms 25 Sep 2023 849th HumanoidCPU 173 773 7ms 16 Apr 2024 849th Mabeloid 🇳🇴 173 773 6ms 21 Sep 2024 849th CaedenHarper 🇨🇦 173 773 5ms 22 Jan 2025 857th Zach1031 173 795 371ms 23 Nov 2025 858th Mabeloid 🇳🇴 173 855 358ms 21 Sep 2024 859th dokutan 172 606 735ms 15 Jul 2025 860th KatieLG 🇬🇧 172 776 5ms 11 Dec 2023 860th Shanethegamer 🇺🇸 172 776 6ms 11 Dec 2023 860th theunofficialcoder 172 776 5ms 12 Jan 2024 860th HumanoidCPU 172 776 5ms 16 Apr 2024 860th KatieLG-Transpiler 🇬🇧 172 776 5ms 16 Aug 2024 860th Mabeloid 🇳🇴 172 776 4ms 21 Sep 2024 860th CaedenHarper 🇨🇦 172 776 8ms 20 Jan 2025 860th Babafaba 172 776 7ms 29 Oct 2025 868th Mabeloid 🇳🇴 172 800 375ms 21 Sep 2024 868th GolfingSuccess 🇬🇷 172 800 355ms 17 Oct 2024 868th aksyristos 172 800 333ms 18 Oct 2024 868th QeepQeep 172 800 369ms 10 Nov 2024 868th Quirkly-Quasar 172 800 366ms 23 Nov 2024 868th neel11235813 172 800 338ms 9 Dec 2024 868th Schmitt-Very-Cool 172 800 350ms 28 May 2025 868th JOrE-Softwares 172 800 364ms 1 Jun 2025 868th BREMAUCY 🇫🇷 172 800 350ms 7 Aug 2025 868th JOrE20 🇺🇸 172 800 354ms 6 Nov 2025 868th gigaprofisi 🇺🇸 172 800 317ms 13 Nov 2025 879th yhm138 172 802 336ms 17 Feb 2025 880th dokutan 172 1,259 5ms 14 Dec 2023 First Prev 801–880 of 1,343 Next Last