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 401st lynn 754 104 103ms 18 May 2021 402nd edsrzf 🇳🇿 754 114 8ms 17 days ago 403rd edsrzf 🇳🇿 753 110 3ms 14 Nov 2025 404th inventshah 752 122 428ms 17 Dec 2022 404th Alex-x90 🇺🇸 752 122 461ms 15 Feb 2023 406th codereport 🇨🇦 751 77 571ms 17 Apr 2025 407th Natanaelel 🇸🇪 750 44 35ms 28 Nov 2023 407th olleicua 🇺🇸 750 44 45ms 11 Mar 2024 409th drew-loukusa 749 64 3ms 7 Mar 2020 410th green-beans 747 88 9ms 30 Jan 2021 410th ndren 747 88 9ms 12 Nov 2023 410th zacjl 747 88 16ms 20 Sep 2024 410th Bulmenisaurus 747 88 19ms 7 Jul 2025 410th InigoK 🇺🇸 747 88 9ms 10 Sep 2025 415th snoozingnewt 🇨🇦 746 97 8ms 1 Nov 2023 416th albanian-laundromat 746 253 712ms 19 Oct 2025 417th annaproxy 744 83 449ms 21 Jan 2024 417th lifthrasiir 🇰🇷 744 83 405ms 2 Dec 2024 419th the-zammers 743 106 122ms 10 Nov 2023 419th YAJUE114514 743 106 116ms 30 Jul 2025 421st snoozingnewt 🇨🇦 743 125 114ms 20 Nov 2025 422nd m-tkach 🇺🇦 743 147 26ms 16 May 2022 423rd dokutan 743 254 393ms 10 days ago 424th Steffan153 🇫🇮 742 139 27ms 27 Dec 2022 425th Irratix 🇳🇱 739 89 20ms 29 Apr 2022 425th ZakkkkAttackkkk 🇵🇭 739 89 9ms 16 Aug 2022 425th steffan-polygolf 739 89 9ms 7 Mar 2024 425th Languag3 739 89 10ms 17 days ago 429th cywong-amino 🇭🇰 739 98 8ms 7 Oct 2020 430th Shanethegamer 🇺🇸 739 125 10ms 14 Jun 2024 431st jwhear 🇺🇸 739 209 1,777ms 1 Oct 2024 432nd Natanaelel 🇸🇪 738 65 2ms 9 Aug 2021 433rd GrayJoKing 🇦🇺 737 70 36ms 28 May 2021 433rd prplz 🇦🇺 737 70 43ms 29 Dec 2021 433rd janlelis 737 70 43ms 13 Sep 2024 436th MeWhenI 🇻🇦 737 122 40ms 13 Feb 2025 437th zacjl 736 105 2ms 10 Nov 2023 438th HolmDev 736 107 114ms 4 Sep 2025 439th GrayJoKing 🇦🇺 736 140 26ms 6 Jan 2023 440th andersk 🇺🇸 735 92 3ms 21 Mar 2020 441st billings7 🇬🇧 735 117 359ms 21 Nov 2021 441st hemphen 735 117 383ms 26 Sep 2022 441st emgordon154 735 117 4ms 28 Dec 2024 441st Yax42 🇫🇷 735 117 388ms 15 Jun 2025 441st namelessiw 735 117 373ms 19 Jun 2025 446th btnlq 734 79 2ms 16 Nov 2022 447th inventshah 734 80 1ms 8 Sep 2022 448th stefangimmillaro 734 135 464ms 7 Oct 2025 449th GrayJoKing 🇦🇺 733 45 3ms 12 Feb 2022 449th Natanaelel 🇸🇪 733 45 45ms 29 Jul 2022 451st NickTheEASDude 🇺🇸 733 111 1ms 29 Jan 2025 452nd scpchicken 🇵🇼 732 62 116ms 26 Mar 2022 453rd jared-hughes 731 90 10ms 7 Oct 2021 453rd LogicalJoe 731 90 9ms 29 Sep 2022 453rd AlephSquirrel 731 90 16ms 3 Dec 2022 453rd DialFrost 🇸🇬 731 90 9ms 12 Dec 2022 453rd inventshah 731 90 11ms 24 Sep 2023 453rd KasperKivimaeki 🇫🇮 731 90 10ms 12 Jul 2025 453rd LHuitre 731 90 9ms 1 Sep 2025 460th BambooleanLogic 🇸🇪 731 99 9ms 5 Dec 2022 460th tayloia 🇬🇧 731 99 9ms 16 May 2023 460th Lv0Sys 🇵🇱 731 99 8ms 21 days ago 463rd kaascevich 731 127 104ms 24 Jul 2025 464th jared-hughes 729 106 2ms 3 Nov 2023 464th qwertyuiop3 🇷🇺 729 106 1ms 29 May 2025 466th rak1507 🇬🇧 729 108 129ms 23 Sep 2021 467th iakolzin 729 126 1,153ms 26 May 2022 468th MeWhenI 🇻🇦 727 109 40ms 26 Aug 2023 468th albanian-laundromat 727 109 40ms 19 Aug 2025 470th primo-ppcg 🇹🇭 726 71 40ms 13 Dec 2020 470th Natanaelel 🇸🇪 726 71 43ms 9 Aug 2021 472nd AlephSquirrel 726 85 452ms 22 Jan 2024 473rd prplz 🇦🇺 724 100 9ms 13 Oct 2020 473rd Naruyoko 724 100 9ms 3 Mar 2023 475th JDHuber23 723 91 9ms 23 Oct 2023 475th Grrisly 723 91 10ms 4 Nov 2023 475th stertooy 🇧🇪 723 91 9ms 13 Jun 2024 475th CaedenHarper 🇨🇦 723 91 9ms 2 Nov 2024 475th KatieLG 🇬🇧 723 91 10ms 3 Aug 2025 480th Reconcyl 722 109 129ms 5 Jan 2019 First Prev 401–480 of 2,425 Next Last