The Calendar hole will go live in approximately 9 days. Why not try and solve it ahead of time?
Kolakoski Sequence 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 881st dokutan 660 69 740ms 30 Aug 2025 882nd SirBogman 🇺🇸 658 108 72ms 3 Jan 2022 883rd Trunksistor 🇫🇷 657 75 10ms 25 May 2022 883rd celiendonze 🇨🇭 657 75 11ms 16 Jun 2023 883rd qwjhvbxi 657 75 10ms 9 Feb 2024 883rd wenbang24 657 75 14ms 6 Apr 2024 887th uttumuttu 🇫🇮 656 71 9ms 8 Jan 2022 887th olleicua 🇺🇸 656 71 9ms 20 Feb 2024 889th annaproxy 656 91 95ms 13 Jan 2023 890th AdrienHache 🇫🇷 654 91 374ms 31 Dec 2023 891st emgordon154 653 65 140ms 6 Sep 2024 892nd albanian-laundromat 653 98 39ms 24 days ago 893rd olivermrose 🇺🇸 652 57 3ms 24 Aug 2021 894th boxjelly 649 65 38ms 11 Feb 2021 894th msbranicky 649 65 40ms 12 Sep 2023 896th Waffle3z 648 76 11ms 20 Jan 2021 896th hellwue 648 76 10ms 16 Nov 2023 896th yuchuehw 648 76 17ms 18 Jan 2024 899th Shanethegamer 🇺🇸 648 97 8ms 22 Dec 2023 900th jwhear 🇺🇸 647 171 1,847ms 1 Oct 2024 901st johnnythedoggie 644 106 107ms 3 Mar 2021 901st snoozingnewt 🇨🇦 644 106 94ms 21 Nov 2025 903rd NickTheEASDude 🇺🇸 641 95 1ms 1 Jul 2024 904th emgordon154 641 98 10ms 10 Dec 2024 905th msbranicky 641 134 277ms 3 Oct 2023 906th nephila-nacrea 🇬🇧 640 58 3ms 3 Feb 2021 907th f-tucker 640 77 11ms 2 Feb 2024 907th undefinedRyan 640 77 11ms 19 Apr 2025 907th Emutis 🇱🇹 640 77 10ms 12 Sep 2025 910th alomiF 640 102 124ms 4 Nov 2024 911th Bubbler-4 639 97 72ms 13 Sep 2023 912th Maznek 638 73 10ms 30 Jun 2023 913th MeWhenI 🇻🇦 637 82 10ms 21 Jul 2023 914th janbehrens 🇩🇪 636 135 281ms 13 Jun 2021 915th Shanethegamer 🇺🇸 635 57 246ms 27 Jul 2023 916th sreyfe 635 119 162ms 9 Jun 2024 917th MateuszPietrzak 🇵🇱 634 112 67ms 16 Jan 2024 918th DialFrost 🇸🇬 633 67 131ms 3 Aug 2024 919th MeWhenI 🇻🇦 633 90 4,253ms 24 Oct 2024 920th dokutan 633 94 326ms 18 Jul 2025 921st AkashTandon167 632 78 10ms 25 May 2021 921st jhpaques 🇫🇷 632 78 21ms 30 Nov 2022 923rd SirBogman 🇺🇸 632 84 2ms 14 Dec 2021 924th emgordon154 632 186 661ms 30 May 2025 925th NewDefectus 🇮🇱 630 59 6ms 25 Oct 2021 926th janbehrens 🇩🇪 629 136 25ms 9 Jul 2021 927th Shanethegamer 🇺🇸 625 64 2ms 26 Jul 2023 928th twocatsinatrenchcoat 624 79 9ms 29 Mar 2022 928th SniperSmiley 🇺🇸 624 79 35ms 23 Jun 2022 928th Glinte 624 79 16ms 14 Dec 2023 928th Bmrl7 624 79 14ms 19 Mar 2024 932nd CaedenHarper 🇨🇦 624 107 520ms 6 Oct 2025 933rd MeWhenI 🇻🇦 622 101 14ms 9 May 2024 934th edsrzf 🇳🇿 622 138 273ms 21 Dec 2024 935th emgordon154 622 151 8ms 6 Oct 2024 936th janbehrens 🇩🇪 620 68 54ms 18 Jan 2021 937th ovs-code 🇩🇪 619 48 354ms 2 Jan 2024 938th Yewzir 🇧🇪 619 64 5ms 16 Nov 2023 939th MeWhenI 🇻🇦 619 106 341ms 26 Aug 2023 940th AkashTandon167 618 86 2ms 25 May 2021 941st dokutan 618 106 11ms 24 Mar 2025 942nd bastienvoirin 🇫🇷 616 80 16ms 4 Feb 2021 942nd argusdusty 🇺🇸 616 80 17ms 25 Mar 2021 942nd OppositeShark 616 80 11ms 9 Apr 2022 942nd WillowWispy 616 80 9ms 16 Mar 2025 946th Shanethegamer 🇺🇸 614 85 4ms 21 Dec 2024 947th codename68 614 123 136ms 13 Aug 2022 948th orthoplex 🇨🇽 613 153 19ms 25 Jun 2023 949th Shanethegamer 🇺🇸 612 192 486ms 2 Apr 2025 950th ashtraypettingzoo 🇺🇸 611 36 32ms 23 Feb 2023 951st omurakazuaki 🇯🇵 611 69 43ms 19 Feb 2021 952nd Herbert00709 🇵🇱 611 87 2ms 19 Nov 2024 953rd Shanethegamer 🇺🇸 610 65 6ms 2 Aug 2022 954th JRaspass 🇬🇧 609 61 3ms 5 Sep 2021 955th vodker1 608 81 10ms 9 Mar 2022 955th tooningelaere 608 81 9ms 5 Dec 2022 957th primo-ppcg 🇹🇭 607 110 381ms 2 Aug 2021 957th Lydxn 🇨🇦 607 110 381ms 28 Feb 2022 959th AbhayAravinda 605 77 9ms 1 May 2021 960th Natanaelel 🇸🇪 604 88 2ms 9 May 2024 First Prev 881–960 of 1,872 Next Last