The Calendar hole will go live in approximately 40 hours. Why not try and solve it ahead of time?
Reversi 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 401st yuchuehw 353 310 20ms 4 Jun 2024 401st Flekay 🇩🇪 353 310 21ms 11 Jul 2025 403rd klixel 🇨🇦 348 314 297ms 14 Jul 2025 404th dokutan 346 279 22ms 2 days ago 405th MichalMarsalek 🇨🇿 346 352 372ms 7 Jun 2024 406th KatieLG 🇬🇧 343 398 399ms 14 Oct 2024 407th dokutan 342 256 792ms 30 Aug 2025 408th BREMAUCY 🇫🇷 340 322 22ms 24 Aug 2025 409th Yewzir 🇧🇪 335 326 14ms 10 Jun 2024 410th mbittner20 334 327 14ms 28 Apr 2025 411th markusgraube 332 329 16ms 1 Jul 2024 412th Yax42 🇫🇷 328 245 135ms 7 Oct 2025 413th FortuiteMan 🇫🇷 327 334 22ms 27 Nov 2025 414th knutae 🇳🇴 319 343 25ms 23 Jun 2024 414th jameswmccarty 319 343 29ms 11 Oct 2024 416th JOrE20 🇺🇸 318 358 11ms 5 days ago 417th Babafaba 317 345 20ms 5 Nov 2025 418th Babafaba 314 337 937ms 30 Oct 2025 419th msbranicky 306 294 218ms 18 Sep 2024 420th adamnielson42 🇺🇸 288 380 15ms 16 Oct 2024 421st Yax42 🇫🇷 278 421 135ms 7 Oct 2025 422nd FlorianCassayre 🇫🇷 276 396 52ms 1 Jun 2024 423rd croc54 271 403 13ms 3 Feb 2025 424th jtaxen 257 425 52ms 3 Jun 2024 425th mrmena 🇦🇺 232 636 47ms 9 Jun 2024 426th iczelia 🇩🇪 219 499 14ms 23 Oct 2025 427th Upload-and-View 🇺🇦 215 508 16ms 21 Aug 2025 428th scpchicken 🇵🇼 207 529 12ms 1 Jun 2024 429th hiichbindermax 201 545 15ms 4 Jun 2024 429th KatieLG-Transpiler 🇬🇧 201 545 13ms 16 Aug 2024 431st two-bad 🇬🇧 178 638 11ms 10 Aug 2025 432nd Jacob385 150 903 448ms 22 Jun 2024 433rd anter69 🇭🇺 138 793 13ms 25 days ago 434th Zhenyu-Bo 131 833 12ms 1 Aug 2025 435th aksyristos 128 852 13ms 5 Oct 2025 436th Msleizak 🇫🇷 115 725 310ms 23 Jul 2025 437th KatieLG 🇬🇧 99 3,659 90ms 9 Jun 2024 438th AidanWalter 59 1,869 14ms 28 Nov 2025 439th error256 0 121 1,731ms 4 May 2025 440th ovs-code 🇩🇪 0 126 14ms 20 Jun 2025 441st edsrzf 🇳🇿 0 170 242ms 29 May 2025 442nd aiwana 0 238 42ms 22 Oct 2025 443rd dokutan 0 467 62ms 28 Jun 2025 First Prev 401–443 of 443
