The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them 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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily 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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 716th madex 🇩🇪 658 100 10ms 9 Jul 2024 716th LvLError 658 100 10ms 29 May 2025 716th vgamula 🇺🇦 658 100 10ms 5 Aug 2025 724th alexkunin 658 110 10ms 6 Jul 2019 725th prplz 🇦🇺 657 69 123ms 22 Mar 2020 726th ZakkkkAttackkkk 🇵🇭 657 84 51ms 26 Dec 2021 727th FEZfan 🇦🇺 657 94 561ms 26 Apr 2025 727th dokutan 657 94 484ms 14 days ago 729th primo-ppcg 🇹🇭 657 151 445ms 25 Sep 2020 730th DaCoolOne 656 124 2ms 21 Nov 2019 730th frosster 🇨🇦 656 124 1ms 2 Nov 2025 732nd stefangimmillaro 656 131 407ms 15 Jun 2025 733rd anter69 🇭🇺 653 79 36ms 7 Sep 2021 733rd olleicua 🇺🇸 653 79 37ms 15 Jan 2024 735th stefangimmillaro 653 167 282ms 13 Dec 2024 736th alexsave 652 111 9ms 13 Nov 2025 737th NewDefectus 🇮🇱 651 101 10ms 21 Apr 2021 737th eddvrs 651 101 9ms 20 Aug 2022 737th commandz0 🇺🇸 651 101 10ms 29 Sep 2022 737th benson-z 651 101 10ms 6 Dec 2024 737th fkantelberg 651 101 10ms 11 Jul 2025 742nd boxjelly 650 121 120ms 5 Jan 2021 743rd Shanethegamer 🇺🇸 650 125 2ms 24 Jan 2024 744th adamnielson42 🇺🇸 649 99 6ms 20 Nov 2023 745th stefangimmillaro 649 143 156ms 29 Oct 2023 746th AlexDaniel 🇪🇪 648 70 142ms 22 Jun 2018 746th Natanaelel 🇸🇪 648 70 107ms 29 Apr 2022 748th SirBogman 🇺🇸 647 51 32ms 13 Nov 2022 749th postie77 647 133 384ms 5 May 2023 750th Mabeloid 🇳🇴 646 112 9ms 26 Oct 2024 751st rvdnieuwendijk 🇳🇱 645 75 266ms 14 Jul 2020 752nd scpchicken 🇵🇼 645 102 10ms 26 Mar 2022 752nd mdnestor 645 102 11ms 27 Dec 2022 752nd FranklinJiaChen 645 102 9ms 19 Jul 2024 752nd BoBz200 645 102 10ms 9 Nov 2024 752nd FortuiteMan 🇫🇷 645 102 10ms 3 Dec 2025 757th angel-p57 🇯🇵 645 196 1ms 23 Nov 2023 758th h3ra993huskp 🇯🇵 644 154 369ms 30 Nov 2025 759th Yewzir 🇧🇪 643 144 7ms 17 Dec 2023 760th DialFrost 🇸🇬 642 99 4ms 8 Dec 2023 761st iznax 641 113 9ms 2 Jul 2020 761st emgordon154 641 113 10ms 6 Sep 2024 761st Salutations45 641 113 8ms 22 Nov 2024 764th BrMorrison 640 123 122ms 6 Nov 2023 765th Shanethegamer 🇺🇸 639 124 36ms 13 Jun 2022 766th RYNO8 638 103 10ms 26 Aug 2021 766th Bonjour27891 🇻🇳 638 103 11ms 15 Mar 2022 766th Alex-x90 🇺🇸 638 103 10ms 25 Oct 2023 766th Bmrl7 638 103 9ms 3 Mar 2024 766th souta-1326 638 103 9ms 26 Mar 2025 766th wobblybits 638 103 9ms 15 Aug 2025 772nd 4hg 🇺🇸 637 81 34ms 29 Sep 2022 772nd inventshah 637 81 36ms 24 Sep 2023 774th rifatx 637 135 369ms 6 Jul 2024 775th MichalMarsalek 🇨🇿 636 97 458ms 21 Jan 2024 776th yanjs 635 124 117ms 23 Jan 2022 776th strout 635 124 121ms 17 Aug 2022 778th Steffan153 🇫🇮 635 199 2ms 19 Feb 2026 779th prestosilver 🇺🇸 634 122 2ms 12 days ago 780th AlephSquirrel 634 142 41ms 21 Mar 2025 781st janbehrens 🇩🇪 634 145 62ms 20 Nov 2022 782nd KasperKivimaeki 🇫🇮 634 172 270ms 11 days ago 783rd hoodadam 632 104 9ms 14 Jun 2019 783rd stordev 632 104 10ms 26 Feb 2021 783rd ahmetdemirag 🇨🇾 632 104 10ms 21 Jun 2024 783rd comp0zr 632 104 9ms 10 Oct 2024 787th Meowsan91 🇨🇿 632 136 395ms 21 Nov 2021 788th iczelia 🇩🇪 631 76 3ms 16 Oct 2025 789th DialFrost 🇸🇬 630 85 4ms 12 Aug 2024 790th frobinsonj 630 115 10ms 28 Jun 2018 790th draxler-h 630 115 10ms 13 Jan 2023 790th LukeBridges 🇬🇧 630 115 14ms 1 Oct 2024 793rd Waffle3z 629 82 34ms 17 Oct 2020 793rd AgentIvan 🇺🇦 629 82 37ms 28 Jan 2021 795th janbehrens 🇩🇪 628 145 454ms 24 Mar 2022 796th kevinmchung 626 105 9ms 18 Sep 2018 796th sambirnbaum1 626 105 9ms 15 Sep 2019 796th feherd 626 105 10ms 29 Aug 2021 796th redbeancola 626 105 10ms 5 Nov 2021 796th mousetail 🇳🇱 626 105 10ms 2 Nov 2022 First Prev 721–800 of 2,556 Next Last