The Calendar hole will go live in approximately 13 days. 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 241st elgan65536 761 246 170ms 3 Oct 2024 242nd thisishowmymindworks 🇳🇴 758 150 14ms 9 Jun 2024 243rd sean-niemann 🇺🇸 751 138 3,705ms 25 Oct 2024 244th MostParsingVex 751 247 26ms 6 Jan 2025 245th error256 747 163 363ms 2 Sep 2024 246th stefangimmillaro 742 184 397ms 10 Apr 2025 247th error256 741 158 132ms 15 Apr 2025 248th lifthrasiir 🇰🇷 740 143 843ms 2 Dec 2024 249th error256 735 119 749ms 13 Sep 2025 250th helbling 🇨🇭 733 155 15ms 1 Jun 2024 251st SB-945 729 150 32ms 8 Jun 2024 252nd OllieBoyne 🇬🇧 724 151 30ms 6 Jun 2024 253rd MeWhenI 🇻🇦 724 155 138ms 3 Aug 2024 254th MeWhenI 🇻🇦 724 173 2ms 5 Jul 2024 255th Shanethegamer 🇺🇸 721 235 12ms 13 Jun 2024 256th commandblockguy 🇺🇸 720 147 645ms 1 Sep 2025 257th commandblockguy 🇺🇸 719 152 26ms 3 Jun 2024 258th MeWhenI 🇻🇦 718 193 761ms 7 Jun 2024 259th MeWhenI 🇻🇦 717 146 6ms 22 Aug 2024 260th lifthrasiir 🇰🇷 715 153 66ms 12 Nov 2024 261st Steffan153 🇫🇮 715 189 493ms 23 Jul 2024 262nd edsrzf 🇳🇿 708 191 489ms 11 Nov 2025 263rd MeWhenI 🇻🇦 700 219 7ms 10 Jun 2024 264th stefangimmillaro 699 203 113ms 25 Aug 2024 265th Shanethegamer 🇺🇸 699 268 188ms 2 Jun 2024 266th edsrzf 🇳🇿 695 241 48ms 4 Apr 2025 267th albanian-laundromat 690 348 909ms 21 days ago 268th Shanethegamer 🇺🇸 688 221 1,334ms 1 Jun 2024 269th Shanethegamer 🇺🇸 687 171 85ms 13 Jun 2024 270th Yewzir 🇧🇪 685 301 1,910ms 9 Jun 2024 271st mousetail 🇳🇱 684 183 2ms 23 Sep 2025 272nd MeWhenI 🇻🇦 682 131 36ms 13 Aug 2024 273rd Shanethegamer 🇺🇸 682 352 615ms 10 Apr 2025 274th Shanethegamer 🇺🇸 681 240 228ms 14 Jun 2024 275th AlephSquirrel 678 225 38ms 21 Oct 2024 276th adyache 🇺🇸 677 330 769ms 21 Jun 2024 277th snoozingnewt 🇨🇦 675 162 26ms 4 days ago 278th Yewzir 🇧🇪 674 286 288ms 9 Jun 2024 279th MeWhenI 🇻🇦 666 205 410ms 1 Jun 2024 280th MeWhenI 🇻🇦 665 255 6ms 10 Jun 2024 281st Shanethegamer 🇺🇸 663 214 113ms 1 Jun 2024 282nd KasperKivimaeki 🇫🇮 662 189 3ms 3 Sep 2025 283rd Shanethegamer 🇺🇸 659 207 438ms 12 Jun 2024 284th snoozingnewt 🇨🇦 657 161 741ms 4 days ago 285th MeWhenI 🇻🇦 657 216 117ms 1 Jun 2024 286th kritixilithos 655 114 35ms 1 Jun 2024 286th error256 655 114 32ms 16 Jun 2024 286th MeWhenI 🇻🇦 655 114 36ms 15 Jul 2025 289th Shanethegamer 🇺🇸 652 234 39ms 4 Oct 2024 290th EnTerr 651 168 18ms 5 Jun 2024 291st namelessiw 650 208 792ms 16 Oct 2025 292nd ovs-code 🇩🇪 644 116 32ms 1 Jun 2024 292nd retrohun 644 116 36ms 7 Jun 2024 294th Shanethegamer 🇺🇸 642 216 449ms 7 Jun 2024 295th qpwoeirut 639 171 22ms 1 Oct 2025 296th ahmetdemirag 🇨🇾 636 172 45ms 5 Feb 2025 297th MeWhenI 🇻🇦 636 295 35ms 12 Jul 2025 298th MeWhenI 🇻🇦 632 186 17ms 10 Jun 2024 299th error256 627 238 4,421ms 15 Apr 2025 300th MeWhenI 🇻🇦 626 157 10ms 20 Jun 2024 301st Shanethegamer 🇺🇸 622 158 10ms 13 Jun 2024 302nd albanian-laundromat 618 177 60ms 17 Nov 2025 303rd albanian-laundromat 609 463 16ms 18 Sep 2025 304th olleicua 🇺🇸 608 132 57ms 25 Feb 2025 305th galloj 🇨🇿 607 123 28ms 9 Jun 2024 306th Shanethegamer 🇺🇸 606 189 563ms 12 Jun 2024 307th retrohun 606 202 196ms 19 Aug 2024 308th MeWhenI 🇻🇦 603 145 944ms 15 Sep 2025 309th stefangimmillaro 602 124 36ms 12 Nov 2025 310th albanian-laundromat 601 176 1,099ms 17 Nov 2025 311th Shanethegamer 🇺🇸 600 203 344ms 13 Jun 2024 312th CornerMercury 🇬🇧 597 183 1,816ms 24 days ago 313th MeWhenI 🇻🇦 597 204 462ms 27 Jul 2024 314th Shanethegamer 🇺🇸 590 136 44ms 1 Jun 2024 315th CaedenHarper 🇨🇦 590 327 288ms 20 Nov 2025 316th Shanethegamer 🇺🇸 585 231 552ms 24 Sep 2025 317th Shanethegamer 🇺🇸 580 202 101ms 13 Jun 2024 318th Yewzir 🇧🇪 578 265 7ms 9 Jun 2024 319th snoozingnewt 🇨🇦 577 200 91ms 26 days ago 320th bac0id 576 259 80ms 24 Jun 2024 First Prev 241–320 of 441 Next Last