The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Reversi 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 Shanethegamer 🇺🇸 551 152 1,066ms 1 Jun 2024 322nd Lv0Sys 🇵🇱 550 349 254ms 7 days ago 323rd Shanethegamer 🇺🇸 548 189 6ms 28 Sep 2024 324th msbranicky 547 278 8ms 11 Aug 2024 325th MeWhenI 🇻🇦 545 155 138ms 3 Aug 2024 326th commandblockguy 🇺🇸 543 147 645ms 1 Sep 2025 327th Shanethegamer 🇺🇸 540 171 85ms 13 Jun 2024 328th dokutan 538 182 12ms 15 Jun 2025 329th dokutan 537 172 15ms 1 Jul 2024 330th dokutan 528 159 893ms 30 Aug 2025 331st jerrandolph 528 363 275ms 29 Sep 2025 332nd OllieBoyne 🇬🇧 526 151 30ms 6 Jun 2024 333rd bac0id 524 237 2ms 24 Jun 2024 334th commandblockguy 🇺🇸 523 152 26ms 3 Jun 2024 335th wh3n3v3r 🇨🇿 519 153 51ms 12 Nov 2024 336th msbranicky 516 372 328ms 14 Aug 2024 337th Yax42 🇫🇷 515 261 860ms 16 Oct 2025 338th madex 🇩🇪 503 247 2ms 10 Jun 2024 339th dokutan 499 160 387ms 5 Jun 2024 340th olleicua 🇺🇸 497 132 57ms 25 Feb 2025 341st dokutan 497 160 18ms 5 Jun 2024 342nd MeWhenI 🇻🇦 497 186 17ms 10 Jun 2024 343rd Yewzir 🇧🇪 497 371 26ms 9 Jun 2024 344th dokutan 494 171 138ms 21 Jun 2025 345th h3ra993huskp 🇯🇵 490 274 662ms 18 days ago 346th Yewzir 🇧🇪 489 323 6ms 9 Jun 2024 347th Shanethegamer 🇺🇸 485 228 5ms 13 Jun 2024 348th Shanethegamer 🇺🇸 483 136 44ms 1 Jun 2024 349th mousetail 🇳🇱 482 183 22ms 27 Sep 2024 350th msbranicky 479 315 161ms 14 Aug 2024 351st bac0id 477 284 398ms 24 Jun 2024 352nd EnTerr 473 168 18ms 5 Jun 2024 353rd dokutan 463 290 991ms 24 Sep 2025 354th Yewzir 🇧🇪 463 293 410ms 22 Dec 2024 355th ahmetdemirag 🇨🇾 462 172 45ms 5 Feb 2025 356th dokutan 461 191 608ms 15 Jun 2024 357th MeWhenI 🇻🇦 461 299 44ms 3 Sep 2024 358th hacker112 🇸🇪 460 213 12ms 27 Jun 2024 359th msbranicky 452 349 6ms 14 Aug 2024 360th Yewzir 🇧🇪 445 302 91ms 19 Dec 2024 361st yuchuehw 441 180 20ms 4 Jun 2024 362nd CaedenHarper 🇨🇦 439 309 423ms 21 Oct 2025 363rd BREMAUCY 🇫🇷 427 186 22ms 4 Oct 2025 364th acollett89 424 231 10ms 18 Jul 2025 365th bac0id 424 317 481ms 24 Jun 2024 366th Yewzir 🇧🇪 423 188 15ms 10 Jun 2024 367th targrik 423 245 28ms 29 Jul 2025 368th didion0 🇺🇸 415 236 16ms 21 Feb 2025 369th annaproxy 414 192 199ms 28 Aug 2025 370th MeWhenI 🇻🇦 414 293 1,811ms 20 Jun 2024 371st Babafaba 411 194 413ms 30 Oct 2025 372nd madeforlosers 406 241 45ms 18 Oct 2024 373rd dokutan 406 334 367ms 5 Jun 2024 374th Yewzir 🇧🇪 402 410 157ms 9 Jun 2024 375th Babafaba 401 198 21ms 30 Oct 2025 376th coreynash 401 244 15ms 12 Jun 2024 377th LHLaurini 🇧🇷 396 314 2ms 29 Jun 2024 378th CaedenHarper 🇨🇦 393 249 11ms 25 Sep 2025 379th CaedenHarper 🇨🇦 392 343 739ms 7 Oct 2025 380th InigoK 🇺🇸 388 205 22ms 22 Sep 2025 381st dokutan 376 273 3,395ms 23 Oct 2024 382nd guilhem-roy 🇫🇷 375 212 2,297ms 26 days ago 383rd elgan65536 370 215 14ms 3 Oct 2024 384th blaztoma 🇱🇹 367 377 126ms 20 days ago 385th TobyBoyne 🇬🇧 356 223 18ms 6 Jun 2024 386th msbranicky 356 288 3,958ms 9 Jan 2025 387th CaedenHarper 🇨🇦 354 237 1,438ms 30 Sep 2025 388th tomh1012 353 384 423ms 12 Nov 2025 389th mousetail 🇳🇱 345 230 23ms 22 Sep 2025 390th CaedenHarper 🇨🇦 345 231 572ms 7 days ago 391st CaedenHarper 🇨🇦 343 232 22ms 7 days ago 392nd MichalMarsalek 🇨🇿 343 352 372ms 7 Jun 2024 393rd KatieLG 🇬🇧 341 398 399ms 14 Oct 2024 394th IISResetMe 340 232 1,445ms 14 Jun 2024 395th gigaprofisi 🇺🇸 318 308 11ms 1 Nov 2025 396th msbranicky 313 254 37ms 9 Aug 2024 397th stefangabos 🇷🇴 313 313 11ms 17 Nov 2025 398th msbranicky 312 256 715ms 2 Jun 2024 399th zakariamouhid 310 316 12ms 8 Jun 2024 400th Bulmenisaurus 307 259 33ms 5 Jan 2025 First Prev 321–400 of 439 Next Last