The Calendar hole will go live in approximately 8 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 241st MeWhenI 🇻🇦 673 131 36ms 13 Aug 2024 242nd Shanethegamer 🇺🇸 671 235 12ms 13 Jun 2024 243rd Yewzir 🇧🇪 671 286 288ms 9 Jun 2024 244th Yax42 🇫🇷 666 147 23ms 10 Sep 2025 245th Shanethegamer 🇺🇸 662 148 12ms 12 Jun 2024 246th MeWhenI 🇻🇦 661 205 410ms 1 Jun 2024 247th ovs-code 🇩🇪 659 121 652ms 2 Jul 2024 248th Shanethegamer 🇺🇸 658 214 113ms 1 Jun 2024 249th orthoplex 🇨🇽 657 121 22ms 1 Jun 2024 250th KasperKivimaeki 🇫🇮 657 189 3ms 3 Sep 2025 251st rucin93 🇵🇱 655 129 134ms 31 Oct 2024 252nd Shanethegamer 🇺🇸 655 207 438ms 12 Jun 2024 253rd scpchicken 🇵🇼 654 78 6ms 3 Jun 2024 254th MeWhenI 🇻🇦 654 122 550ms 1 Jun 2024 255th Yewzir 🇧🇪 653 233 7ms 9 Jun 2024 255th rucin93 🇵🇱 653 233 45ms 15 days ago 257th MeWhenI 🇻🇦 652 216 117ms 1 Jun 2024 258th nwellnhof 🇩🇪 651 122 18ms 1 Jun 2024 258th MeWhenI 🇻🇦 651 122 24ms 7 Jun 2024 258th sisyphus-ppcg 🇦🇺 651 122 18ms 25 Jul 2024 261st kritixilithos 647 114 35ms 1 Jun 2024 261st error256 647 114 32ms 16 Jun 2024 261st MeWhenI 🇻🇦 647 114 36ms 15 Jul 2025 264th MeWhenI 🇻🇦 646 79 6ms 1 Jun 2024 265th ovs-code 🇩🇪 646 123 18ms 1 Jun 2024 265th ryyyn 🇺🇸 646 123 26ms 5 Nov 2025 267th namelessiw 646 208 792ms 16 Oct 2025 268th xsot 🇸🇬 638 125 549ms 2 Jun 2024 268th SirBogman 🇺🇸 638 125 504ms 2 Jun 2024 270th Shanethegamer 🇺🇸 637 216 449ms 7 Jun 2024 271st ovs-code 🇩🇪 636 116 32ms 1 Jun 2024 271st retrohun 636 116 36ms 7 Jun 2024 273rd edsrzf 🇳🇿 636 125 17ms 14 days ago 274th KatieLG 🇬🇧 633 126 3,150ms 6 Oct 2025 275th helbling 🇨🇭 632 155 15ms 1 Jun 2024 276th MeWhenI 🇻🇦 632 295 35ms 12 Jul 2025 277th 5cw 🇺🇸 631 126 18ms 1 Jun 2024 277th stefangimmillaro 631 126 18ms 30 Jan 2025 277th bricknellj 631 126 17ms 6 Feb 2025 277th KatieLG 🇬🇧 631 126 2,640ms 15 Sep 2025 281st error256 622 238 4,421ms 15 Apr 2025 282nd AlephSquirrel 621 128 30ms 4 Jun 2024 283rd MeWhenI 🇻🇦 619 157 10ms 20 Jun 2024 284th AlephSquirrel 619 225 38ms 21 Oct 2024 285th MeWhenI 🇻🇦 619 255 6ms 10 Jun 2024 286th ovs-code 🇩🇪 617 137 130ms 17 Apr 2025 287th ndren 616 129 298ms 11 Jul 2025 288th emgordon154 616 150 11ms 10 Dec 2024 289th Shanethegamer 🇺🇸 615 158 10ms 13 Jun 2024 290th GrayJoKing 🇦🇺 612 138 142ms 14 Aug 2024 290th error256 612 138 132ms 6 May 2025 292nd albanian-laundromat 606 463 16ms 18 Sep 2025 293rd albanian-laundromat 600 133 462ms 10 Sep 2025 294th retrohun 600 202 196ms 19 Aug 2024 295th galloj 🇨🇿 599 123 28ms 9 Jun 2024 296th Shanethegamer 🇺🇸 599 189 563ms 12 Jun 2024 297th jatloe 598 133 366ms 28 Oct 2024 298th stefangimmillaro 595 124 36ms 12 Nov 2025 299th Shanethegamer 🇺🇸 595 234 39ms 4 Oct 2024 300th Shanethegamer 🇺🇸 594 203 344ms 13 Jun 2024 301st blaztoma 🇱🇹 593 86 5ms 12 days ago 302nd GolfingSuccess 🇬🇷 593 134 20ms 1 Jun 2024 303rd MeWhenI 🇻🇦 591 204 462ms 27 Jul 2024 304th CaedenHarper 🇨🇦 587 327 288ms 20 Nov 2025 305th bizy-coder 582 137 496ms 1 Jun 2024 306th Shanethegamer 🇺🇸 582 231 552ms 24 Sep 2025 307th tatzyr 🇯🇵 581 113 178ms 26 Mar 2025 308th MeWhenI 🇻🇦 579 145 944ms 15 Sep 2025 309th blaztoma 🇱🇹 576 138 24ms 12 days ago 310th Shanethegamer 🇺🇸 574 202 101ms 13 Jun 2024 311th bizy-coder 572 139 30ms 1 Jun 2024 311th cros107 🇦🇺 572 139 28ms 19 Jun 2024 313th edsrzf 🇳🇿 572 241 48ms 4 Apr 2025 314th bac0id 572 259 80ms 24 Jun 2024 315th davecame 568 140 20ms 16 Jul 2024 315th Emutis 🇱🇹 568 140 23ms 11 days ago 317th error256 567 90 4ms 4 Sep 2024 318th MostParsingVex 565 238 750ms 23 Jul 2024 319th Yewzir 🇧🇪 563 268 183ms 9 Jun 2024 320th snoozingnewt 🇨🇦 559 252 106ms 20 Nov 2025 First Prev 241–320 of 440 Next Last