The Calendar hole will go live in approximately 3 days. Why not try and solve it ahead of time?
Diamonds 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 641st MeWhenI 🇻🇦 664 93 350ms 17 Jan 2024 641st emgordon154 664 93 397ms 7 Jun 2025 641st albanian-laundromat 664 93 603ms 5 Oct 2025 644th drew-loukusa 664 99 9ms 26 May 2020 644th Secozzi 664 99 9ms 20 Oct 2020 644th seanshpark 664 99 10ms 18 Dec 2020 644th soalyer 664 99 10ms 9 Nov 2021 644th CodyMiner 664 99 10ms 14 Nov 2021 644th MichalMarsalek 🇨🇿 664 99 9ms 23 Oct 2022 644th logvp 664 99 10ms 6 Oct 2024 644th BREMAUCY 🇫🇷 664 99 10ms 7 Aug 2025 652nd stefangimmillaro 664 109 8ms 17 Oct 2023 652nd KrausRaus 🇺🇸 664 109 9ms 13 Dec 2023 652nd olleicua 🇺🇸 664 109 9ms 5 Feb 2024 652nd junkondo-jp 664 109 9ms 30 Jun 2024 652nd targrik 664 109 10ms 8 Jun 2025 657th TomvdPeet 662 96 5ms 24 days ago 658th D-MOVE 🇵🇭 661 78 38ms 21 days ago 659th bendapootie 660 117 2ms 10 Jul 2020 660th minetoblend 659 133 2,389ms 9 Oct 2025 661st alexkunin 658 110 9ms 6 Jul 2019 661st Yax42 🇫🇷 658 110 9ms 6 Sep 2025 663rd lukechampine 658 163 266ms 19 Apr 2020 663rd MeWhenI 🇻🇦 658 163 279ms 10 Feb 2023 665th prplz 🇦🇺 657 69 107ms 22 Mar 2020 666th ZakkkkAttackkkk 🇵🇭 657 84 51ms 26 Dec 2021 667th FEZfan 🇦🇺 657 94 485ms 26 Apr 2025 668th PiterAnnema 657 100 9ms 23 Mar 2022 668th neihousaigaai 657 100 9ms 17 Apr 2022 668th Heathcorp 🇦🇺 657 100 11ms 2 Dec 2022 668th aksyristos 657 100 9ms 2 Feb 2023 668th 5quiwyrm 657 100 9ms 27 Jul 2023 668th snoozingnewt 🇨🇦 657 100 10ms 23 Sep 2023 668th madex 🇩🇪 657 100 9ms 9 Jul 2024 668th LostSyntax21 🇬🇧 657 100 10ms 2 Dec 2024 668th Pyroan 657 100 10ms 21 Feb 2025 668th LvLError 657 100 10ms 29 May 2025 668th Flekay 🇩🇪 657 100 10ms 10 Jul 2025 668th vgamula 🇺🇦 657 100 9ms 5 Aug 2025 680th stefangimmillaro 656 131 368ms 15 Jun 2025 681st primo-ppcg 🇹🇭 656 151 486ms 25 Sep 2020 682nd DaCoolOne 655 124 2ms 21 Nov 2019 682nd frosster 655 124 1ms 2 Nov 2025 684th stefangimmillaro 655 143 147ms 29 Oct 2023 685th anter69 🇭🇺 653 79 41ms 7 Sep 2021 685th olleicua 🇺🇸 653 79 36ms 15 Jan 2024 687th alexsave 652 111 9ms 13 Nov 2025 688th NewDefectus 🇮🇱 651 101 9ms 21 Apr 2021 688th eddvrs 651 101 9ms 20 Aug 2022 688th commandblockguy 🇺🇸 651 101 9ms 29 Sep 2022 688th benson-z 651 101 9ms 6 Dec 2024 688th fkantelberg 651 101 13ms 11 Jul 2025 693rd boxjelly 650 121 120ms 5 Jan 2021 694th Shanethegamer 🇺🇸 650 125 2ms 24 Jan 2024 695th adamnielson42 🇺🇸 649 99 6ms 20 Nov 2023 696th AlexDaniel 🇪🇪 648 70 139ms 22 Jun 2018 696th Natanaelel 🇸🇪 648 70 106ms 29 Apr 2022 698th SirBogman 🇺🇸 647 51 32ms 13 Nov 2022 699th Steffan153 🇫🇮 647 153 431ms 16 Feb 2023 700th Mabeloid 🇳🇴 646 112 9ms 26 Oct 2024 701st postie77 646 133 376ms 5 May 2023 702nd scpchicken 🇵🇼 645 102 9ms 26 Mar 2022 702nd mdnestor 645 102 9ms 27 Dec 2022 702nd FranklinJiaChen 645 102 9ms 19 Jul 2024 702nd BoBz200 645 102 10ms 9 Nov 2024 702nd FortuiteMan 🇫🇷 645 102 9ms 25 days ago 707th rvdnieuwendijk 🇳🇱 644 75 232ms 14 Jul 2020 708th h3ra993huskp 🇯🇵 643 154 472ms 30 Nov 2025 709th angel-p57 🇯🇵 643 196 1ms 23 Nov 2023 710th DialFrost 🇸🇬 642 99 5ms 8 Dec 2023 711th Yewzir 🇧🇪 642 144 6ms 17 Dec 2023 712th stefangimmillaro 642 167 266ms 13 Dec 2024 713th iznax 641 113 8ms 2 Jul 2020 713th emgordon154 641 113 9ms 6 Sep 2024 713th Salutations45 641 113 9ms 22 Nov 2024 716th BrMorrison 640 123 122ms 6 Nov 2023 717th Shanethegamer 🇺🇸 639 124 36ms 13 Jun 2022 718th RYNO8 638 103 9ms 26 Aug 2021 718th Bonjour27891 🇻🇳 638 103 10ms 15 Mar 2022 718th Alex-x90 🇺🇸 638 103 9ms 25 Oct 2023 First Prev 641–720 of 2,426 Next Last