The Calendar hole will go live in approximately 9 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 480th RussellEmerine 722 109 124ms 27 Feb 2020 482nd Gaddy 🇫🇷 722 119 348ms 12 May 2022 483rd emgordon154 721 130 169ms 14 Mar 2025 484th stefangimmillaro 719 111 99ms 15 Oct 2022 485th CLOStrophobic 🇮🇹 718 124 7ms 23 Apr 2025 486th MeWhenI 🇻🇦 718 138 459ms 7 Nov 2025 486th DardS8Br 718 138 421ms 16 days ago 488th NewDefectus 🇮🇱 717 77 51ms 6 Dec 2021 489th KatieLG 🇬🇧 717 92 891ms 22 Oct 2021 489th error256 717 92 773ms 31 Oct 2025 491st thisishowmymindworks 🇳🇴 717 101 9ms 5 Oct 2020 492nd ovs-code 🇩🇪 717 108 70ms 12 Sep 2024 493rd csharpython 716 72 38ms 28 Aug 2025 494th user189032 716 110 120ms 29 May 2019 495th yzhs 🇩🇪 715 92 9ms 18 Jan 2020 495th prplz 🇦🇺 715 92 10ms 28 Dec 2021 495th StefanHabel 🇨🇦 715 92 9ms 12 Dec 2022 495th betaveros 715 92 10ms 30 Dec 2022 495th markusgraube 715 92 10ms 2 Jul 2023 495th OwPowell 715 92 10ms 18 Dec 2023 501st Andriamanitra 🇫🇮 714 81 374ms 23 Jul 2023 502nd MeWhenI 🇻🇦 713 112 5ms 12 Sep 2022 503rd typeswitch-dev 🇵🇹 712 122 3ms 22 Jul 2023 504th Shanethegamer 🇺🇸 711 112 1,274ms 24 Jan 2024 505th dokutan 711 130 8ms 8 May 2024 506th primo-ppcg 🇹🇭 711 151 265ms 17 Apr 2020 507th dee-gomma 710 102 9ms 31 Mar 2019 507th uttumuttu 🇫🇮 710 102 8ms 6 Jan 2022 509th bendapootie 710 121 345ms 21 Nov 2021 509th iznax 710 121 370ms 21 Nov 2021 511th yokasuretsu 709 64 155ms 21 Jun 2018 512th neihousaigaai 709 93 998ms 13 Feb 2024 513th arjanadriaanse 🇳🇱 709 111 122ms 7 Feb 2022 514th giacomogallina 707 93 17ms 14 Jun 2019 514th LlamaLad7 🇬🇧 707 93 9ms 15 Mar 2020 514th loserface69 707 93 9ms 15 Mar 2020 514th MeWhenI 🇻🇦 707 93 10ms 28 Oct 2021 514th Kloppermand 🇩🇰 707 93 9ms 6 Jan 2023 514th FEZfan 🇦🇺 707 93 9ms 11 Jul 2025 514th jesterjunk 707 93 9ms 23 Sep 2025 521st FlyingPenguin223 706 73 35ms 7 Nov 2023 521st DialFrost 🇸🇬 706 73 34ms 2 Jun 2024 521st Lv0Sys 🇵🇱 706 73 49ms 21 days ago 524th qwertyuiop3 🇷🇺 706 130 77ms 29 May 2025 525th GrayJoKing 🇦🇺 705 76 4ms 11 Sep 2024 526th omurakazuaki 🇯🇵 703 103 9ms 18 Feb 2021 526th neihousaigaai 703 103 9ms 17 Mar 2021 528th 4hg 🇺🇸 702 94 1,028ms 8 Dec 2022 529th Shanethegamer 🇺🇸 701 88 417ms 24 Jan 2024 529th CaedenHarper 🇨🇦 701 88 454ms 28 Jan 2025 531st btjones0 699 94 10ms 7 Dec 2021 531st OllieBoyne 🇬🇧 699 94 9ms 17 Sep 2022 531st Eilonlif 🇮🇱 699 94 9ms 4 Nov 2022 531st stefangimmillaro 699 94 10ms 6 Jul 2023 531st mathisfun271 699 94 9ms 16 Dec 2023 531st albanian-laundromat 699 94 12ms 17 Apr 2025 531st Keegan-T 🇨🇦 699 94 9ms 22 Apr 2025 538th Euler-37 699 106 39ms 4 Jun 2023 539th Yewzir 🇧🇪 698 221 2,560ms 14 Nov 2025 540th pilaf 🇦🇷 697 74 39ms 8 Apr 2022 540th sisyphus-ppcg 🇦🇺 697 74 50ms 18 Oct 2023 542nd trinityy-7 696 104 9ms 22 Jul 2025 543rd MeWhenI 🇻🇦 696 111 1ms 13 Aug 2024 544th dokutan 696 119 2ms 16 days ago 545th KasperKivimaeki 🇫🇮 695 132 2,983ms 20 Nov 2025 546th steffan-polygolf 694 89 416ms 7 Mar 2024 547th tomtheisen 🇺🇸 692 95 9ms 4 Dec 2019 547th jiaminglimjm 🇲🇾 692 95 10ms 29 Feb 2020 547th Yewzir 🇧🇪 692 95 10ms 14 Apr 2023 547th NanduBC 692 95 9ms 6 Sep 2024 547th EnTerr 692 95 10ms 15 Sep 2024 547th wuduculfre 692 95 10ms 21 Jul 2025 553rd emgordon154 692 223 2,038ms 11 hours ago 554th retrohun 691 85 1ms 25 Aug 2024 555th Attero 🇸🇪 690 112 2ms 28 May 2020 555th keelimeguy 🇺🇸 690 112 2ms 4 Nov 2023 557th anastos 690 114 120ms 23 Jul 2018 557th DanielVenable 690 114 122ms 26 Mar 2025 559th drabart 🇵🇱 690 133 2,785ms 17 Nov 2023 560th lynn 688 48 33ms 9 May 2021 First Prev 481–560 of 2,425 Next Last
