The Calendar hole will go live in approximately 13 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 321st namelessiw 792 125 407ms 6 Oct 2025 322nd tclune 789 94 39ms 21 Mar 2021 323rd kg583 🇺🇸 789 109 7ms 17 Nov 2025 324th KasperKivimaeki 🇫🇮 788 98 2ms 4 Nov 2023 325th itsh01 787 92 9ms 14 Dec 2021 325th dmrichwa 🇺🇸 787 92 9ms 7 Nov 2023 327th Awsute 787 100 123ms 11 Nov 2022 327th tobeannouncd 787 100 123ms 3 Jan 2024 327th Shanethegamer 🇺🇸 787 100 123ms 24 Jan 2024 327th Natanaelel 🇸🇪 787 100 120ms 23 Apr 2025 331st stackofbears 786 42 33ms 8 Feb 2022 331st SirBogman 🇺🇸 786 42 2ms 9 Feb 2023 331st MeWhenI 🇻🇦 786 42 45ms 3 Sep 2023 334th bobbogomip 786 61 2ms 7 Nov 2018 335th Natanaelel 🇸🇪 785 84 835ms 9 Sep 2021 335th SirBogman 🇺🇸 785 84 1,214ms 13 Nov 2022 337th primo-ppcg 🇹🇭 784 74 2ms 16 Nov 2022 338th ovs-code 🇩🇪 784 90 1ms 9 Oct 2023 339th kg583 🇺🇸 783 84 16ms 31 Oct 2024 339th kops-cg 783 84 15ms 26 Feb 2025 341st perlebach 🇨🇿 783 112 3,567ms 8 Jun 2025 342nd emgordon154 783 118 6ms 8 Dec 2024 343rd Shanethegamer 🇺🇸 783 241 469ms 23 Jan 2025 344th GrayJoKing 🇦🇺 782 106 3ms 9 Nov 2023 344th error256 782 106 3ms 28 Jun 2024 346th MeWhenI 🇻🇦 781 66 49ms 15 Jul 2022 346th stefangimmillaro 781 66 38ms 6 Jan 2023 348th duckyluuk 🇳🇱 781 79 382ms 28 Mar 2024 349th LucaArgentiUCF 🇮🇹 780 95 40ms 28 Jan 2021 349th stefangimmillaro 780 95 40ms 26 Apr 2025 351st retrohun 778 87 2ms 17 Aug 2024 352nd jared-hughes 778 93 8ms 4 Jan 2023 352nd MeWhenI 🇻🇦 778 93 9ms 3 Sep 2023 352nd inventshah 778 93 8ms 26 Sep 2023 352nd two-bad 🇬🇧 778 93 9ms 23 Feb 2024 356th prplz 🇦🇺 778 118 447ms 3 Jan 2022 356th ovs-code 🇩🇪 778 118 78ms 3 Jun 2024 358th emgordon154 776 69 4ms 7 Jun 2025 359th MeWhenI 🇻🇦 776 102 371ms 27 Jul 2024 360th emgordon154 776 113 4,005ms 11 Nov 2024 361st marcin7Cd 774 85 17ms 1 Jan 2021 361st orthoplex 🇨🇽 774 85 16ms 26 Jul 2021 361st aposteriorist 🇨🇦 774 85 10ms 28 Jan 2022 364th DialFrost 🇸🇬 774 128 439ms 19 Nov 2025 365th Alex-x90 🇺🇸 773 100 2ms 15 Feb 2023 366th SirBogman 🇺🇸 772 80 394ms 15 Jan 2024 366th kg583 🇺🇸 772 80 371ms 1 Nov 2024 368th sean-niemann 🇺🇸 772 118 479ms 12 Aug 2025 369th primo-ppcg 🇹🇭 772 200 1,707ms 16 Sep 2025 370th PatrickStephansen 🇿🇦 770 94 9ms 21 Sep 2020 370th Alex-x90 🇺🇸 770 94 9ms 22 Feb 2023 372nd stefangimmillaro 769 114 3,906ms 29 Oct 2024 373rd lynn 769 134 27ms 11 Jul 2023 374th primo-ppcg 🇹🇭 768 103 378ms 16 Jan 2021 375th Bubbler-4 767 43 34ms 15 Dec 2021 375th rak1507 🇬🇧 767 43 3ms 21 Feb 2022 377th toschug 765 83 4ms 26 Feb 2020 377th targrik 765 83 8ms 22 days ago 379th edre 765 86 16ms 7 Jun 2018 379th anter69 🇭🇺 765 86 9ms 8 Feb 2023 381st GrayJoKing 🇦🇺 763 83 6ms 21 days ago 382nd ETHproductions 🇺🇸 762 95 9ms 17 Dec 2018 382nd coreynash 762 95 8ms 22 Nov 2022 382nd helbling 🇨🇭 762 95 9ms 3 May 2024 385th AlephSquirrel 762 114 4ms 6 Aug 2024 386th JRaspass 🇬🇧 761 63 2ms 3 Apr 2022 387th jared-hughes 760 89 3ms 4 Jan 2023 388th GrayJoKing 🇦🇺 760 166 2ms 7 Feb 2021 389th tailorspy 759 121 58ms 24 May 2024 390th anter69 🇭🇺 758 87 924ms 13 Mar 2025 391st inventshah 757 102 2ms 17 Dec 2022 392nd JRaspass 🇬🇧 756 60 169ms 3 Apr 2022 393rd MeWhenI 🇻🇦 756 85 3ms 17 Feb 2025 394th vezzick 756 87 9ms 12 Mar 2021 394th hallvabo 🇳🇴 756 87 16ms 6 Apr 2024 394th tri1212 🇻🇳 756 87 13ms 30 Jun 2024 397th prplz 🇦🇺 755 64 270ms 28 Dec 2021 398th Maznek 754 96 8ms 23 Jun 2023 398th voytxt 🇨🇿 754 96 9ms 8 Mar 2025 400th lynn 754 104 103ms 18 May 2021 First Prev 321–400 of 2,425 Next Last