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?
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 658th stefangimmillaro 872 77 126ms 4 Dec 2022 658th Re-Adventures 🇮🇳 872 77 119ms 8 Dec 2023 658th snoozingnewt 🇨🇦 872 77 122ms 9 Oct 2025 661st primo-ppcg 🇹🇭 872 195 1,428ms 13 Aug 2025 662nd Shanethegamer 🇺🇸 871 74 7ms 20 Dec 2024 663rd DialFrost 🇸🇬 871 146 1,622ms 18 Jan 2026 664th postie77 870 86 384ms 26 Jul 2023 664th Illuminum2 870 86 370ms 22 May 2025 664th snoozingnewt 🇨🇦 870 86 388ms 9 Oct 2025 667th zacjl 870 88 42ms 14 Feb 2025 668th nwellnhof 🇩🇪 869 30 36ms 20 Nov 2022 669th JDiLenarda 🇫🇷 869 75 1,272ms 15 Dec 2023 670th primo-ppcg 🇹🇭 869 92 56ms 20 Nov 2022 670th Steffan153 🇫🇮 869 92 62ms 2 Dec 2022 670th sean-niemann 🇺🇸 869 92 60ms 5 Feb 2025 670th DialFrost 🇸🇬 869 92 60ms 9 Dec 2025 674th janbehrens 🇩🇪 869 115 295ms 19 Nov 2022 674th msbranicky 869 115 298ms 21 Aug 2023 674th harshit54 869 115 297ms 6 Oct 2023 674th arctouch-cristiannevianna 869 115 299ms 25 Mar 2024 674th rifatx 869 115 294ms 22 Jul 2024 674th ibeucaly 869 115 290ms 6 Sep 2024 680th canissimia 🇦🇶 869 131 2,150ms 31 Oct 2023 681st m-tkach 🇺🇦 868 69 3ms 19 Nov 2022 682nd fuzzylojik-golf 🇺🇸 868 91 371ms 24 Sep 2025 682nd dokutan 868 91 382ms 24 Sep 2025 682nd sean-niemann 🇺🇸 868 91 380ms 24 Sep 2025 682nd Shanethegamer 🇺🇸 868 91 469ms 25 Sep 2025 682nd nwellnhof 🇩🇪 868 91 495ms 25 Sep 2025 682nd Yewzir 🇧🇪 868 91 373ms 2 Oct 2025 682nd namelessiw 868 91 410ms 4 Oct 2025 682nd Yax42 🇫🇷 868 91 512ms 4 Oct 2025 682nd stefangimmillaro 868 91 437ms 6 Oct 2025 682nd snoozingnewt 🇨🇦 868 91 380ms 9 Oct 2025 682nd CaedenHarper 🇨🇦 868 91 397ms 19 Oct 2025 682nd MeWhenI 🇻🇦 868 91 382ms 7 Nov 2025 682nd emgordon154 868 91 377ms 9 Feb 2026 682nd Steffan153 🇫🇮 868 91 389ms 11 Feb 2026 682nd raphaelimahorn 868 91 463ms 11 days ago 682nd edsrzf 🇳🇿 868 91 392ms 22 hours ago 682nd roelderickx 868 91 388ms 2 hours ago 699th orthoplex 🇨🇽 868 102 261ms 29 Jun 2023 699th Steffan153 🇫🇮 868 102 249ms 20 Jul 2024 701st MeWhenI 🇻🇦 867 63 15ms 9 Oct 2023 701st GolfingSuccess 🇬🇷 867 63 15ms 14 Oct 2023 703rd Re-Adventures 🇮🇳 867 85 131ms 9 Jun 2023 703rd elgan65536 🇺🇸 867 85 133ms 24 Sep 2023 703rd drabart 🇵🇱 867 85 135ms 15 Dec 2023 703rd Aurel300 🇨🇭 867 85 128ms 6 Jun 2024 703rd wuzekai518 867 85 136ms 5 Aug 2024 703rd edsrzf 🇳🇿 867 85 133ms 16 Nov 2024 703rd luuumine 🇫🇷 867 85 129ms 18 Nov 2025 710th elgan65536 🇺🇸 866 62 21ms 18 Nov 2023 710th Rubiksmath 866 62 3,665ms 22 Dec 2023 710th 123mjb 866 62 20ms 27 Nov 2025 713th ashtraypettingzoo 🇺🇸 866 66 152ms 11 Feb 2023 714th Lydxn 🇨🇦 865 92 44ms 11 Jul 2023 715th Betuaredead 864 74 136ms 7 Jan 2023 715th dokutan 864 74 139ms 8 Jun 2024 715th snoozingnewt 🇨🇦 864 74 146ms 9 Oct 2025 718th DialFrost 🇸🇬 864 141 1,427ms 28 Mar 2025 718th emgordon154 864 141 1,471ms 28 Mar 2025 718th Shanethegamer 🇺🇸 864 141 1,415ms 10 Apr 2025 First Prev 641–720 of 2,740 Next Last