The Calendar hole will go live in approximately 5 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 🇺🇸 607 150 442ms 12 Dec 2022 802nd cduerm 606 177 312ms 12 Nov 2020 803rd jacobly0 🇺🇸 605 109 955ms 17 Aug 2023 804th gastropner 604 128 2ms 23 Dec 2020 804th Yewzir 🇧🇪 604 128 1ms 9 Feb 2024 806th Ripick 604 131 364ms 16 Jul 2024 807th Mr-Xcoder 603 109 9ms 17 Jun 2018 807th geofft 603 109 9ms 10 Dec 2020 807th Marsolo1 603 109 10ms 18 Apr 2023 807th TaserTheFox 🇺🇸 603 109 9ms 2 May 2023 807th smilesformiles3 603 109 9ms 14 Jun 2025 807th jacekwladzinski 603 109 9ms 5 Oct 2025 813th mintypython 603 120 8ms 18 Oct 2018 814th KatieLG 🇬🇧 601 143 394ms 30 Jul 2024 815th WillConker 601 156 187ms 25 Oct 2024 816th rak1507 🇬🇧 600 55 32ms 21 Feb 2022 817th didroe 600 86 36ms 7 Nov 2024 818th kmathis22 600 165 456ms 28 Oct 2025 819th Babafaba 599 103 536ms 23 Nov 2025 820th pandapawskat 599 129 1ms 4 Oct 2021 821st Andre3582 598 110 9ms 27 Oct 2020 821st jacklynnepenick 598 110 16ms 20 Aug 2021 823rd Shanethegamer 🇺🇸 598 121 9ms 28 Apr 2022 824th lahell 597 81 226ms 7 Jun 2020 824th dcgjb 597 81 207ms 4 Jun 2024 826th roavin 597 144 359ms 28 Jul 2022 827th hiddicop 🇸🇪 593 87 42ms 27 Jan 2021 827th Irratix 🇳🇱 593 87 39ms 4 Mar 2022 829th gigaprofisi 🇺🇸 593 122 8ms 18 Jun 2025 830th Skepfyr 593 158 130ms 4 Jan 2020 831st jerrandolph 593 181 274ms 16 Apr 2020 832nd MeWhenI 🇻🇦 592 81 30ms 15 Apr 2023 833rd adoxography 592 111 10ms 3 Oct 2019 833rd suchwise 592 111 10ms 29 Oct 2019 833rd mortimervonchappuis 592 111 10ms 16 Mar 2020 833rd luftj 592 111 10ms 9 Jul 2020 833rd dgambit 592 111 9ms 5 May 2021 833rd clementblaudeau 592 111 11ms 2 Jun 2021 833rd knutae 🇳🇴 592 111 10ms 1 Dec 2021 833rd JudeTyrrell 592 111 9ms 6 Oct 2024 833rd WillConker 592 111 9ms 25 Oct 2024 842nd czylabsonasa 🇭🇺 590 98 358ms 21 Oct 2021 843rd Yewzir 🇧🇪 590 182 264ms 29 Oct 2023 844th elisherer 🇮🇱 589 77 132ms 20 Apr 2019 845th DialFrost 🇸🇬 589 82 235ms 7 Jun 2024 846th MeWhenI 🇻🇦 589 91 4ms 16 Aug 2024 847th MeWhenI 🇻🇦 588 120 1ms 10 Oct 2023 848th TessSSBM 587 112 10ms 14 Oct 2019 848th OwenElliottDev 587 112 9ms 26 Jul 2020 848th BrenSchaap 587 112 9ms 21 Oct 2021 848th guilhem-roy 🇫🇷 587 112 10ms 25 Feb 2022 848th Mabeloid 🇳🇴 587 112 9ms 19 Sep 2024 853rd DestyNova 🇮🇪 586 135 364ms 15 Aug 2022 854th Mabeloid 🇳🇴 586 160 143ms 31 Oct 2025 855th 12Jeef 586 169 411ms 1 Sep 2023 855th yoshykai 586 169 385ms 30 Mar 2025 857th kdx2a 585 132 2ms 13 Feb 2025 858th itserasmus 584 124 8ms 25 Jan 2024 859th skps2010 582 113 9ms 12 Jan 2019 859th Iluvatar 582 113 10ms 11 May 2020 859th Psirving 582 113 9ms 2 Aug 2020 859th constant-stranger 582 113 9ms 7 Feb 2022 859th CedricGebistorf 582 113 10ms 5 Mar 2022 859th draxler-h 582 113 9ms 13 Jan 2023 859th brimstonetrader 582 113 9ms 26 Mar 2024 866th MeWhenI 🇻🇦 581 121 132ms 3 Aug 2024 867th prplz 🇦🇺 581 188 25ms 10 Jul 2021 868th CaedenHarper 🇨🇦 580 110 772ms 9 Sep 2025 869th MeWhenI 🇻🇦 580 157 433ms 5 Mar 2022 870th DialFrost 🇸🇬 579 57 3ms 7 Feb 2024 871st rak1507 🇬🇧 579 89 38ms 23 Sep 2021 872nd janbehrens 🇩🇪 579 114 850ms 7 Apr 2023 873rd weliveinhell 🇭🇹 579 125 9ms 24 Jan 2024 873rd CaedenHarper 🇨🇦 579 125 9ms 31 Aug 2025 875th yzhs 🇩🇪 579 136 129ms 25 Jun 2023 876th janbehrens 🇩🇪 579 171 388ms 20 Jul 2022 877th chunes3 🇺🇸 578 134 68ms 19 Sep 2023 878th prplz 🇦🇺 578 162 119ms 7 Jan 2020 878th Xzyaihni 578 162 152ms 16 Oct 2022 880th sk- 577 114 9ms 11 Sep 2020 First Prev 801–880 of 2,422 Next Last