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 801st Shanethegamer 🇺🇸 607 125 73ms 16 Feb 2025 802nd Shanethegamer 🇺🇸 607 150 442ms 12 Dec 2022 803rd cduerm 606 177 312ms 12 Nov 2020 804th jacobly0 🇺🇸 605 109 955ms 17 Aug 2023 805th gastropner 604 128 2ms 23 Dec 2020 805th Yewzir 🇧🇪 604 128 1ms 9 Feb 2024 807th Ripick 604 131 364ms 16 Jul 2024 808th Mr-Xcoder 603 109 9ms 17 Jun 2018 808th geofft 603 109 9ms 10 Dec 2020 808th Marsolo1 603 109 10ms 18 Apr 2023 808th TaserTheFox 🇺🇸 603 109 9ms 2 May 2023 808th smilesformiles3 603 109 9ms 14 Jun 2025 808th jacekwladzinski 603 109 9ms 5 Oct 2025 814th mintypython 603 120 8ms 18 Oct 2018 815th KatieLG 🇬🇧 601 143 394ms 30 Jul 2024 816th WillConker 601 156 187ms 25 Oct 2024 817th rak1507 🇬🇧 600 55 32ms 21 Feb 2022 818th didroe 600 86 36ms 7 Nov 2024 818th plcc0 600 86 35ms 20 mins ago 820th kmathis22 600 165 456ms 28 Oct 2025 821st Babafaba 599 103 536ms 23 Nov 2025 822nd pandapawskat 599 129 1ms 4 Oct 2021 823rd Andre3582 598 110 9ms 27 Oct 2020 823rd jacklynnepenick 598 110 16ms 20 Aug 2021 825th Shanethegamer 🇺🇸 598 121 9ms 28 Apr 2022 826th lahell 597 81 226ms 7 Jun 2020 826th dcgjb 597 81 207ms 4 Jun 2024 828th roavin 597 144 359ms 28 Jul 2022 829th hiddicop 🇸🇪 593 87 42ms 27 Jan 2021 829th Irratix 🇳🇱 593 87 39ms 4 Mar 2022 831st gigaprofisi 🇺🇸 593 122 8ms 18 Jun 2025 832nd Skepfyr 593 158 130ms 4 Jan 2020 833rd jerrandolph 593 181 274ms 16 Apr 2020 834th MeWhenI 🇻🇦 592 81 30ms 15 Apr 2023 835th adoxography 592 111 10ms 3 Oct 2019 835th suchwise 592 111 10ms 29 Oct 2019 835th mortimervonchappuis 592 111 10ms 16 Mar 2020 835th luftj 592 111 10ms 9 Jul 2020 835th dgambit 592 111 9ms 5 May 2021 835th clementblaudeau 592 111 11ms 2 Jun 2021 835th knutae 🇳🇴 592 111 10ms 1 Dec 2021 835th JudeTyrrell 592 111 9ms 6 Oct 2024 835th WillConker 592 111 9ms 25 Oct 2024 844th czylabsonasa 🇭🇺 590 98 358ms 21 Oct 2021 845th Yewzir 🇧🇪 590 182 264ms 29 Oct 2023 846th elisherer 🇮🇱 589 77 132ms 20 Apr 2019 847th DialFrost 🇸🇬 589 82 235ms 7 Jun 2024 848th MeWhenI 🇻🇦 589 91 4ms 16 Aug 2024 849th MeWhenI 🇻🇦 588 120 1ms 10 Oct 2023 850th TessSSBM 587 112 10ms 14 Oct 2019 850th OwenElliottDev 587 112 9ms 26 Jul 2020 850th BrenSchaap 587 112 9ms 21 Oct 2021 850th guilhem-roy 🇫🇷 587 112 10ms 25 Feb 2022 850th Mabeloid 🇳🇴 587 112 9ms 19 Sep 2024 855th DestyNova 🇮🇪 586 135 364ms 15 Aug 2022 856th Mabeloid 🇳🇴 586 160 143ms 31 Oct 2025 857th 12Jeef 586 169 411ms 1 Sep 2023 857th yoshykai 586 169 385ms 30 Mar 2025 859th kdx2a 585 132 2ms 13 Feb 2025 860th itserasmus 584 124 8ms 25 Jan 2024 861st skps2010 582 113 9ms 12 Jan 2019 861st Iluvatar 582 113 10ms 11 May 2020 861st Psirving 582 113 9ms 2 Aug 2020 861st constant-stranger 582 113 9ms 7 Feb 2022 861st CedricGebistorf 582 113 10ms 5 Mar 2022 861st draxler-h 582 113 9ms 13 Jan 2023 861st brimstonetrader 582 113 9ms 26 Mar 2024 868th MeWhenI 🇻🇦 581 121 132ms 3 Aug 2024 869th prplz 🇦🇺 581 188 25ms 10 Jul 2021 870th CaedenHarper 🇨🇦 580 110 772ms 9 Sep 2025 871st MeWhenI 🇻🇦 580 157 433ms 5 Mar 2022 872nd DialFrost 🇸🇬 579 57 3ms 7 Feb 2024 873rd rak1507 🇬🇧 579 89 38ms 23 Sep 2021 874th janbehrens 🇩🇪 579 114 850ms 7 Apr 2023 875th weliveinhell 🇭🇹 579 125 9ms 24 Jan 2024 875th CaedenHarper 🇨🇦 579 125 9ms 31 Aug 2025 877th yzhs 🇩🇪 579 136 129ms 25 Jun 2023 878th janbehrens 🇩🇪 579 171 388ms 20 Jul 2022 879th chunes3 🇺🇸 578 134 68ms 19 Sep 2023 880th prplz 🇦🇺 578 162 119ms 7 Jan 2020 First Prev 801–880 of 2,426 Next Last