The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Kolakoski Sequence 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 561st Shanethegamer 🇺🇸 816 84 435ms 25 Sep 2025 562nd Yewzir 🇧🇪 815 61 105ms 16 Nov 2023 563rd ovs-code 🇩🇪 815 66 2ms 10 Oct 2023 563rd inventshah 815 66 2ms 22 Oct 2023 565th BREMAUCY 🇫🇷 814 59 425ms 20 Feb 2024 566th Steffan153 🇫🇮 814 90 4ms 10 Feb 2023 567th emgordon154 814 107 101ms 14 days ago 568th duckyluuk 🇳🇱 812 70 4,078ms 28 Oct 2024 569th janlelis 811 52 38ms 18 Jan 2021 569th hiddicop 🇸🇪 811 52 37ms 29 Jan 2021 569th prplz 🇦🇺 811 52 48ms 22 Apr 2021 569th anter69 🇭🇺 811 52 37ms 14 Jan 2022 569th OhmNomNom 811 52 86ms 12 Oct 2022 569th olleicua 🇺🇸 811 52 35ms 25 Feb 2024 569th emgordon154 811 52 55ms 26 Nov 2024 576th Shanethegamer 🇺🇸 811 108 265ms 26 Sep 2021 577th vezzick 810 62 12ms 12 Mar 2021 577th schachmattmatt 810 62 11ms 18 Aug 2021 577th cooljoseph1 810 62 20ms 6 May 2022 577th fredrik-bakke 🇳🇴 810 62 18ms 29 Sep 2022 577th nkoppel 810 62 13ms 19 Oct 2022 577th AodhanDalton 810 62 10ms 4 Nov 2022 577th nstearns96 🇬🇧 810 62 17ms 28 Nov 2022 577th adamnielson42 🇺🇸 810 62 11ms 10 Jan 2024 577th jbjd 810 62 11ms 2 Mar 2024 577th wh3n3v3r 🇨🇿 810 62 10ms 12 Nov 2024 577th jacekwladzinski 810 62 12ms 4 Oct 2025 577th Mabeloid 🇳🇴 810 62 13ms 26 Oct 2025 589th Steffan153 🇫🇮 810 79 1,306ms 23 Mar 2023 589th Yewzir 🇧🇪 810 79 38ms 16 Nov 2023 591st Shanethegamer 🇺🇸 810 96 76ms 9 Jun 2022 592nd GolfingSuccess 🇬🇷 808 81 9ms 9 Sep 2022 593rd m-tkach 🇺🇦 808 89 58ms 25 Apr 2022 593rd MeWhenI 🇻🇦 808 89 58ms 8 May 2022 595th Dazza314 🇬🇧 806 24 3ms 16 Apr 2021 596th emgordon154 806 67 2ms 22 Apr 2025 597th Shanethegamer 🇺🇸 806 76 332ms 13 Dec 2021 598th m-tkach 🇺🇦 806 106 25ms 25 Apr 2022 599th ArmaanAS 804 58 9ms 4 Apr 2021 599th itsh01 804 58 8ms 18 Nov 2021 601st Steffan153 🇫🇮 803 60 2ms 6 May 2023 602nd stefangimmillaro 803 80 101ms 23 Sep 2023 603rd emgordon154 803 85 7ms 3 Jan 2025 604th Shanethegamer 🇺🇸 803 94 117ms 25 Jan 2021 605th DaDerpDuck 802 76 1ms 20 Jan 2021 606th prplz 🇦🇺 802 83 125ms 10 Jul 2024 607th MeWhenI 🇻🇦 800 50 3ms 11 Nov 2022 608th GolfingSuccess 🇬🇷 800 69 7ms 24 Dec 2024 609th NewDefectus 🇮🇱 799 35 47ms 25 Jan 2022 610th MeWhenI 🇻🇦 799 88 416ms 28 Feb 2022 611th Yewzir 🇧🇪 799 90 66ms 14 Oct 2023 612th SirBogman 🇺🇸 797 46 314ms 22 Oct 2021 613th apourchot 797 63 18ms 13 Feb 2021 613th neihousaigaai 797 63 12ms 10 Apr 2021 613th lechevalier 797 63 10ms 9 Aug 2021 613th yzhs 🇩🇪 797 63 10ms 7 Jun 2022 613th commandblockguy 🇺🇸 797 63 12ms 19 Sep 2022 613th fourth-bit 797 63 10ms 21 Nov 2022 613th FortuiteMan 🇫🇷 797 63 28ms 8 Sep 2023 613th ssbhatt4321 797 63 26ms 14 Oct 2023 621st Yax42 🇫🇷 796 77 377ms 5 May 2025 622nd tobeannouncd 796 82 124ms 8 Jan 2024 623rd DialFrost 🇸🇬 795 53 60ms 2 Feb 2023 623rd SirBogman 🇺🇸 795 53 43ms 10 Jun 2024 625th primo-ppcg 🇹🇭 795 78 72ms 13 Oct 2023 626th TrueBoxGuy 795 95 115ms 24 Sep 2025 627th GrayJoKing 🇦🇺 794 68 2ms 21 Jan 2021 627th m-tkach 🇺🇦 794 68 5ms 25 Apr 2022 627th MeWhenI 🇻🇦 794 68 2ms 11 Nov 2022 630th GrayJoKing 🇦🇺 794 86 9ms 15 Aug 2023 630th Shanethegamer 🇺🇸 794 86 10ms 11 Jan 2024 632nd MichalMarsalek 🇨🇿 793 84 127ms 6 Jan 2023 633rd SirBogman 🇺🇸 791 31 46ms 7 Oct 2022 634th janbehrens 🇩🇪 791 91 64ms 20 Nov 2022 634th snyderek 🇺🇸 791 91 62ms 21 Nov 2024 634th dokutan 791 91 83ms 18 Jul 2025 637th Salutations45 790 59 9ms 9 Jan 2025 638th Shanethegamer 🇺🇸 790 89 457ms 26 Jul 2023 639th ashtraypettingzoo 🇺🇸 789 19 2ms 3 Apr 2023 639th AlephSquirrel 789 19 2ms 8 Nov 2025 First Prev 561–640 of 1,887 Next Last