The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 400th rak1507 🇬🇧 767 43 3ms 21 Feb 2022 402nd toschug 765 83 5ms 26 Feb 2020 402nd targrik 765 83 8ms 25 Nov 2025 404th edre 765 86 16ms 7 Jun 2018 404th anter69 🇭🇺 765 86 10ms 8 Feb 2023 404th MeWhenI 🇻🇦 765 86 16ms 12 days ago 404th Flekay 🇩🇪 765 86 10ms 55 mins ago 408th AlephSquirrel 764 114 3ms 6 Aug 2024 409th GrayJoKing 🇦🇺 763 83 6ms 26 Nov 2025 410th ETHproductions 🇺🇸 762 95 11ms 17 Dec 2018 410th coreynash 762 95 10ms 22 Nov 2022 410th helbling 🇨🇭 762 95 11ms 3 May 2024 413th JRaspass 🇬🇧 761 63 3ms 3 Apr 2022 414th GrayJoKing 🇦🇺 761 166 2ms 7 Feb 2021 415th jared-hughes 760 89 2ms 4 Jan 2023 416th tailorspy 760 121 61ms 24 May 2024 417th anter69 🇭🇺 759 87 1,238ms 13 Mar 2025 418th inventshah 758 102 2ms 17 Dec 2022 419th JRaspass 🇬🇧 756 60 148ms 3 Apr 2022 420th MeWhenI 🇻🇦 756 85 3ms 17 Feb 2025 421st vezzick 756 87 9ms 12 Mar 2021 421st hallvabo 🇳🇴 756 87 16ms 6 Apr 2024 421st tri1212 🇻🇳 756 87 9ms 30 Jun 2024 421st snoozingnewt 🇨🇦 756 87 16ms 18 days ago 425th prplz 🇦🇺 755 64 256ms 28 Dec 2021 426th Maznek 754 96 10ms 23 Jun 2023 426th voytxt 🇨🇿 754 96 12ms 8 Mar 2025 428th lynn 754 104 155ms 18 May 2021 429th fuzzylojik-golf 🇺🇸 753 82 476ms 9 days ago 430th inventshah 753 122 470ms 17 Dec 2022 430th Alex-x90 🇺🇸 753 122 464ms 15 Feb 2023 432nd dokutan 753 252 1,426ms 14 Jan 2026 433rd lynn 752 134 29ms 11 Jul 2023 434th codereport 🇨🇦 751 77 460ms 17 Apr 2025 435th Natanaelel 🇸🇪 750 44 33ms 28 Nov 2023 435th olleicua 🇺🇸 750 44 37ms 11 Mar 2024 437th albanian-laundromat 750 253 1,411ms 19 Oct 2025 438th drew-loukusa 749 64 3ms 7 Mar 2020 439th kg583 🇺🇸 749 157 3ms 3 days ago 440th Matter1024 🇮🇳 748 120 2,621ms 18 days ago 440th Chinay-Domitrix 🇺🇸 748 120 2,736ms 13 days ago 442nd green-beans 747 88 9ms 30 Jan 2021 442nd ndren 747 88 9ms 12 Nov 2023 442nd zacjl 747 88 16ms 20 Sep 2024 442nd Bulmenisaurus 747 88 19ms 7 Jul 2025 442nd InigoK 🇺🇸 747 88 10ms 10 Sep 2025 447th snoozingnewt 🇨🇦 746 97 10ms 1 Nov 2023 448th m-tkach 🇺🇦 745 147 26ms 16 May 2022 449th madex 🇩🇪 744 65 251ms 10 days ago 450th annaproxy 744 83 482ms 21 Jan 2024 450th lifthrasiir 🇰🇷 744 83 434ms 2 Dec 2024 452nd the-zammers 743 106 122ms 10 Nov 2023 452nd YAJUE114514 743 106 116ms 30 Jul 2025 454th Shanethegamer 🇺🇸 741 125 11ms 14 Jun 2024 455th jwhear 🇺🇸 741 209 1,777ms 1 Oct 2024 456th dokutan 740 134 566ms 14 Jan 2026 457th roelderickx 740 182 2ms 9 days ago 458th Irratix 🇳🇱 739 89 19ms 29 Apr 2022 458th ZakkkkAttackkkk 🇵🇭 739 89 10ms 16 Aug 2022 458th steffan-polygolf 739 89 9ms 7 Mar 2024 458th Languag3 739 89 11ms 5 Dec 2025 462nd cywong-amino 🇭🇰 739 98 10ms 7 Oct 2020 463rd Natanaelel 🇸🇪 738 65 3ms 9 Aug 2021 464th GrayJoKing 🇦🇺 737 70 36ms 28 May 2021 464th prplz 🇦🇺 737 70 35ms 29 Dec 2021 464th janlelis 737 70 34ms 13 Sep 2024 467th MeWhenI 🇻🇦 737 122 40ms 13 Feb 2025 468th zacjl 736 105 2ms 10 Nov 2023 468th Yax42 🇫🇷 736 105 3ms 15 Jan 2026 470th HolmDev 736 107 114ms 4 Sep 2025 471st blaztoma 🇱🇹 736 122 2,658ms 18 days ago 472nd snoozingnewt 🇨🇦 736 125 97ms 20 Nov 2025 473rd andersk 🇺🇸 735 92 3ms 21 Mar 2020 474th billings7 🇬🇧 735 117 381ms 21 Nov 2021 474th hemphen 735 117 407ms 26 Sep 2022 474th emgordon154 735 117 4ms 28 Dec 2024 474th Yax42 🇫🇷 735 117 377ms 15 Jun 2025 474th namelessiw 735 117 366ms 19 Jun 2025 479th stefangimmillaro 735 135 391ms 7 Oct 2025 480th btnlq 734 79 1ms 16 Nov 2022 First Prev 401–480 of 2,561 Next Last