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?
Abundant Numbers (Long) in all languages 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 640th akamayu-ouo 🇹🇼 874 28 5ms 30 Jul 2024 642nd emgordon154 874 75 53ms 5 Dec 2024 643rd SirBogman 🇺🇸 872 35 344ms 20 Nov 2022 643rd Attero 🇸🇪 872 35 318ms 25 Nov 2022 643rd Shanethegamer 🇺🇸 872 35 348ms 18 Dec 2022 646th SirBogman 🇺🇸 872 47 55ms 20 Nov 2022 646th Natanaelel 🇸🇪 872 47 55ms 24 Nov 2022 646th olivermrose 🇺🇸 872 47 53ms 5 Dec 2022 646th anter69 🇭🇺 872 47 53ms 31 Jan 2023 646th olleicua 🇺🇸 872 47 54ms 2 Feb 2024 646th aydamak 872 47 55ms 17 May 2024 646th emgordon154 872 47 54ms 13 Jun 2024 646th error256 872 47 100ms 3 Jul 2024 646th TFeld00 🇩🇰 872 47 62ms 3 Sep 2024 646th tatzyr 🇯🇵 872 47 54ms 23 Oct 2024 646th Babafaba 872 47 54ms 15 Oct 2025 646th Matter1024 🇮🇳 872 47 53ms 14 Nov 2025 646th Just4FunCoder 872 47 57ms 41 hours ago 659th stefangimmillaro 872 77 126ms 4 Dec 2022 659th Re-Adventures 🇮🇳 872 77 119ms 8 Dec 2023 659th snoozingnewt 🇨🇦 872 77 122ms 9 Oct 2025 662nd jkelly467 872 92 107ms 23 hours ago 663rd primo-ppcg 🇹🇭 872 195 1,428ms 13 Aug 2025 664th Shanethegamer 🇺🇸 871 74 7ms 20 Dec 2024 665th DialFrost 🇸🇬 871 146 1,622ms 18 Jan 2026 666th postie77 870 86 384ms 26 Jul 2023 666th Illuminum2 870 86 370ms 22 May 2025 666th snoozingnewt 🇨🇦 870 86 388ms 9 Oct 2025 669th zacjl 870 88 42ms 14 Feb 2025 670th orthoplex 🇨🇽 870 102 261ms 29 Jun 2023 670th Steffan153 🇫🇮 870 102 249ms 20 Jul 2024 672nd nwellnhof 🇩🇪 869 30 36ms 20 Nov 2022 673rd JDiLenarda 🇫🇷 869 75 1,272ms 15 Dec 2023 674th fuzzylojik-golf 🇺🇸 869 91 371ms 24 Sep 2025 674th dokutan 869 91 382ms 24 Sep 2025 674th sean-niemann 🇺🇸 869 91 375ms 24 Sep 2025 674th Shanethegamer 🇺🇸 869 91 469ms 25 Sep 2025 674th nwellnhof 🇩🇪 869 91 495ms 25 Sep 2025 674th Yewzir 🇧🇪 869 91 373ms 2 Oct 2025 674th namelessiw 869 91 410ms 4 Oct 2025 674th Yax42 🇫🇷 869 91 512ms 4 Oct 2025 674th stefangimmillaro 869 91 417ms 6 Oct 2025 674th snoozingnewt 🇨🇦 869 91 380ms 9 Oct 2025 674th CaedenHarper 🇨🇦 869 91 397ms 19 Oct 2025 674th MeWhenI 🇻🇦 869 91 382ms 7 Nov 2025 674th emgordon154 869 91 377ms 9 Feb 2026 674th Steffan153 🇫🇮 869 91 389ms 11 Feb 2026 674th raphaelimahorn 869 91 420ms 15 days ago 674th edsrzf 🇳🇿 869 91 369ms 4 days ago 674th roelderickx 869 91 388ms 3 days ago 691st primo-ppcg 🇹🇭 869 92 56ms 20 Nov 2022 691st Steffan153 🇫🇮 869 92 62ms 2 Dec 2022 691st sean-niemann 🇺🇸 869 92 71ms 5 Feb 2025 691st DialFrost 🇸🇬 869 92 64ms 9 Dec 2025 695th janbehrens 🇩🇪 869 115 295ms 19 Nov 2022 695th msbranicky 869 115 298ms 21 Aug 2023 695th harshit54 869 115 297ms 6 Oct 2023 695th arctouch-cristiannevianna 869 115 299ms 25 Mar 2024 695th rifatx 869 115 294ms 22 Jul 2024 695th ibeucaly 869 115 290ms 6 Sep 2024 701st canissimia 🇦🇶 869 131 2,150ms 31 Oct 2023 702nd m-tkach 🇺🇦 868 69 3ms 19 Nov 2022 703rd MeWhenI 🇻🇦 867 63 15ms 9 Oct 2023 703rd GolfingSuccess 🇬🇷 867 63 15ms 14 Oct 2023 705th Re-Adventures 🇮🇳 867 85 137ms 9 Jun 2023 705th elgan65536 🇺🇸 867 85 121ms 24 Sep 2023 705th drabart 🇵🇱 867 85 130ms 15 Dec 2023 705th Aurel300 🇨🇭 867 85 128ms 6 Jun 2024 705th wuzekai518 867 85 146ms 5 Aug 2024 705th edsrzf 🇳🇿 867 85 140ms 16 Nov 2024 705th luuumine 🇫🇷 867 85 138ms 18 Nov 2025 712th elgan65536 🇺🇸 866 62 21ms 18 Nov 2023 712th Rubiksmath 866 62 3,665ms 22 Dec 2023 712th 123mjb 866 62 20ms 27 Nov 2025 715th ashtraypettingzoo 🇺🇸 866 66 152ms 11 Feb 2023 716th Lydxn 🇨🇦 865 92 44ms 11 Jul 2023 717th Betuaredead 864 74 136ms 7 Jan 2023 717th dokutan 864 74 139ms 8 Jun 2024 717th snoozingnewt 🇨🇦 864 74 146ms 9 Oct 2025 720th DialFrost 🇸🇬 864 141 1,498ms 28 Mar 2025 First Prev 641–720 of 2,749 Next Last