The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Diamonds in Ruby in chars. 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 Chars Time Submitted 1st Lydxn 🇨🇦 1,000 47 34ms 29 Aug 2022 2nd Steffan153 🇫🇮 940 50 35ms 28 Aug 2024 2nd radarek 🇵🇱 940 50 35ms 26 Sep 2025 4th primo-ppcg 🇹🇭 904 52 34ms 22 Aug 2019 4th sean-niemann 🇺🇸 904 52 37ms 12 Oct 2025 6th pardouin 🇫🇷 887 53 35ms 7 days ago 7th JayXon 🇺🇸 839 56 37ms 28 Dec 2021 7th nwellnhof 🇩🇪 839 56 36ms 28 Dec 2021 9th MeWhenI 🇻🇦 797 59 36ms 16 Aug 2022 10th ovs-code 🇩🇪 770 61 36ms 9 May 2023 10th janlelis 770 61 35ms 21 Sep 2024 12th SirBogman 🇺🇸 758 62 36ms 23 May 2022 13th prplz 🇦🇺 723 65 35ms 3 Jan 2020 14th stefangimmillaro 712 66 35ms 6 Jan 2023 14th anter69 🇭🇺 712 66 37ms 25 Jan 2023 14th tatzyr 🇯🇵 712 66 37ms 10 Dec 2024 17th GrayJoKing 🇦🇺 671 70 36ms 28 May 2021 17th plcc0 671 70 36ms 28 Dec 2025 19th Natanaelel 🇸🇪 662 71 35ms 9 Aug 2021 19th olivermrose 🇺🇸 662 71 38ms 25 Sep 2021 19th error256 662 71 36ms 13 days ago 22nd csharpython 653 72 35ms 28 Aug 2025 22nd KatieLG 🇬🇧 653 72 37ms 7 Jan 2026 24th FlyingPenguin223 644 73 40ms 7 Nov 2023 24th DialFrost 🇸🇬 644 73 36ms 2 Jun 2024 24th Lv0Sys 🇵🇱 644 73 36ms 1 Dec 2025 24th D-MOVE 🇵🇭 644 73 38ms 23 Feb 2026 24th madex 🇩🇪 644 73 35ms 8 days ago 29th pilaf 🇦🇷 635 74 36ms 8 Apr 2022 29th sisyphus-ppcg 🇦🇺 635 74 35ms 18 Oct 2023 31st jared-hughes 627 75 35ms 12 Oct 2022 31st dokutan 627 75 34ms 14 Jan 2026 33rd Shanethegamer 🇺🇸 610 77 35ms 16 Dec 2022 33rd aksyristos 610 77 35ms 31 Jan 2023 33rd fuzzylojik-golf 🇺🇸 610 77 36ms 15 hours ago 36th olleicua 🇺🇸 595 79 37ms 15 Jan 2024 37th 4hg 🇺🇸 580 81 34ms 29 Sep 2022 37th inventshah 580 81 36ms 24 Sep 2023 39th Waffle3z 573 82 34ms 17 Oct 2020 39th AgentIvan 🇺🇦 573 82 37ms 28 Jan 2021 41st didroe 547 86 36ms 7 Nov 2024 42nd hiddicop 🇸🇪 540 87 35ms 27 Jan 2021 42nd Irratix 🇳🇱 540 87 35ms 4 Mar 2022 44th rak1507 🇬🇧 528 89 39ms 23 Sep 2021 45th acornellier 516 91 33ms 9 Dec 2018 45th emgordon154 516 91 36ms 4 Jul 2024 45th lacrosse 516 91 33ms 28 Nov 2025 48th Andriamanitra 🇫🇮 511 92 35ms 20 Jul 2022 49th TFeld00 🇩🇰 505 93 35ms 8 Jun 2019 49th OhmNomNom 505 93 35ms 20 Oct 2022 49th neihousaigaai 505 93 36ms 13 Feb 2024 52nd aaronze 🇦🇺 490 96 35ms 17 Sep 2023 53rd adoxography 475 99 35ms 3 Oct 2019 53rd codereport 🇨🇦 475 99 37ms 18 Apr 2025 55th ConorOBrien-Foxx 461 102 35ms 2 Jul 2018 56th hrrs01 456 103 35ms 5 Sep 2018 57th n1LS 439 107 35ms 10 Oct 2019 58th snltd 435 108 35ms 16 Aug 2019 58th janbehrens 🇩🇪 435 108 34ms 1 Jun 2022 58th jacobly0 🇺🇸 435 108 35ms 17 Aug 2023 61st proton 🇩🇪 412 114 34ms 11 Jun 2020 61st TheZwierzLF 🇵🇱 412 114 38ms 6 Jan 2026 63rd denkyuu1 405 116 33ms 15 days ago 64th blaztoma 🇱🇹 385 122 37ms 5 Sep 2025 65th jaredcrystal 🇺🇸 370 127 37ms 14 Dec 2020 66th sapphyrus 356 132 36ms 2 Aug 2019 66th Languag3 356 132 38ms 24 Sep 2025 68th 5cw 🇺🇸 341 138 33ms 27 Apr 2023 68th Ralac07 🇦🇺 341 138 36ms 14 Jun 2024 70th segiddins 313 150 36ms 24 Aug 2018 71st nif33 296 159 35ms 30 Jul 2022 72nd kmathis22 276 170 40ms 10 Oct 2025 73rd Yewzir 🇧🇪 273 172 35ms 6 Feb 2023 74th msbranicky 255 184 37ms 14 Sep 2023 75th tomh1012 250 188 36ms 9 Feb 2026 76th InigoK 🇺🇸 246 191 37ms 25 Apr 2023 77th kenballus 236 199 38ms 4 Dec 2019 77th trist224 🇫🇷 236 199 35ms 28 Nov 2022 77th Betuaredead 236 199 35ms 11 Jan 2023 77th snoozingnewt 🇨🇦 236 199 35ms 7 Sep 2023 1–80 of 125 Next Last