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 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 561st isaacg1 839 79 129ms 3 Jan 2020 561st timvermeulen 839 79 130ms 3 Jan 2020 561st d0x2f 839 79 130ms 5 Jan 2020 561st btjones0 839 79 130ms 8 Jan 2021 561st primo-ppcg 🇹🇭 839 79 123ms 14 Jan 2022 561st stefangimmillaro 839 79 122ms 22 Aug 2023 561st stackofbears 839 79 125ms 22 Oct 2024 568th GolfingSuccess 🇬🇷 837 27 3ms 9 Feb 2023 568th ashtraypettingzoo 🇺🇸 837 27 3ms 3 Apr 2023 568th akamayu-ouo 🇹🇼 837 27 3ms 30 Jul 2024 571st prplz 🇦🇺 837 42 2ms 6 Mar 2020 571st JayXon 🇺🇸 837 42 3ms 25 Oct 2023 571st saito-ta 🇯🇵 837 42 6ms 13 Mar 2024 574th fimmind 836 68 129ms 23 May 2020 575th kg583 🇺🇸 835 49 3ms 23 Nov 2025 576th Shanethegamer 🇺🇸 835 65 90ms 1 Jun 2022 577th Shanethegamer 🇺🇸 834 54 513ms 26 Sep 2024 577th lifthrasiir 🇰🇷 834 54 419ms 2 Dec 2024 577th emgordon154 834 54 474ms 13 Apr 2025 577th albanian-laundromat 834 54 440ms 7 Oct 2025 581st rucin93 🇵🇱 833 53 138ms 15 Jan 2026 582nd blader0x 833 56 9ms 28 Mar 2021 582nd jared-hughes 833 56 10ms 13 Apr 2022 582nd two-bad 🇬🇧 833 56 12ms 15 Feb 2024 582nd pardouin 🇫🇷 833 56 10ms 15 Sep 2024 582nd targrik 833 56 10ms 13 Feb 2025 582nd Laellekoenig 833 56 12ms 31 Oct 2025 588th zx5b 832 66 1ms 30 Nov 2020 588th KasperKivimaeki 🇫🇮 832 66 319ms 5 Sep 2024 588th sean-niemann 🇺🇸 832 66 1,147ms 5 Feb 2026 588th Steffan153 🇫🇮 832 66 2ms 6 days ago 592nd Alessandro-Balconi 🇮🇹 831 45 79ms 26 Dec 2022 593rd xsot 🇸🇬 831 57 5ms 5 May 2025 593rd targrik 831 57 5ms 27 Jun 2025 593rd sean-niemann 🇺🇸 831 57 5ms 38 hours ago 596th Attero 🇸🇪 831 58 17ms 25 Sep 2020 596th GolfingSuccess 🇬🇷 831 58 11ms 10 Oct 2020 596th RYNO8 831 58 18ms 4 Sep 2021 596th shellbertt 🇨🇦 831 58 10ms 4 Dec 2021 596th ZakkkkAttackkkk 🇵🇭 831 58 16ms 15 Dec 2021 596th jroscoe5 831 58 11ms 21 Jul 2022 596th jakobkordez 🇸🇮 831 58 14ms 31 Oct 2022 596th SirBogman 🇺🇸 831 58 12ms 20 Nov 2022 596th QuincyNash 🇺🇸 831 58 11ms 1 Dec 2022 596th Just4FunCoder 831 58 10ms 23 Mar 2023 596th Yewzir 🇧🇪 831 58 10ms 15 Apr 2023 596th 2011-Chan-Ethan 831 58 10ms 5 Jul 2023 596th commandz0 🇺🇸 831 58 10ms 22 Aug 2023 596th FlorianCassayre 🇫🇷 831 58 11ms 18 Sep 2023 596th keelimeguy 🇺🇸 831 58 11ms 6 Nov 2023 596th SB-945 831 58 12ms 31 Mar 2024 596th starfihs 831 58 11ms 5 Jul 2024 596th cuboids 831 58 11ms 16 Jul 2024 596th duckyluuk 🇳🇱 831 58 10ms 15 Aug 2024 596th RaBa21 🇭🇺 831 58 10ms 19 Jul 2025 596th jasonxue1 831 58 10ms 8 Aug 2025 596th Andrey2001 831 58 11ms 27 Nov 2025 596th JOrE20 831 58 10ms 16 Feb 2026 619th nwellnhof 🇩🇪 831 87 456ms 25 Sep 2025 619th DialFrost 🇸🇬 831 87 423ms 17 Nov 2025 621st retrohun 830 59 2ms 30 Dec 2025 622nd fantaize 828 80 126ms 13 days ago 623rd MaliPatuljak 827 37 124ms 3 Sep 2023 624th clockworknazo 826 23 68ms 15 Aug 2022 624th SirBogman 🇺🇸 826 23 73ms 10 Sep 2022 624th primo-ppcg 🇹🇭 826 23 71ms 1 Oct 2022 624th MeWhenI 🇻🇦 826 23 71ms 14 Nov 2022 624th saito-ta 🇯🇵 826 23 70ms 22 Nov 2022 624th Steffan153 🇫🇮 826 23 71ms 18 Dec 2022 624th lynn 826 23 71ms 30 Jan 2023 624th sean-niemann 🇺🇸 826 23 69ms 21 Feb 2023 624th ovs-code 🇩🇪 826 23 73ms 8 Jan 2024 624th emgordon154 826 23 71ms 3 Jun 2025 634th sean-niemann 🇺🇸 825 52 119ms 3 Oct 2025 635th stefangimmillaro 824 59 2,714ms 24 Oct 2024 635th MeWhenI 🇻🇦 824 59 2,818ms 27 Oct 2024 637th SmartK8 🇨🇿 824 73 370ms 13 Nov 2022 637th sean-niemann 🇺🇸 824 73 9ms 38 hours ago 639th KasperKivimaeki 🇫🇮 822 89 626ms 9 Dec 2025 640th janlelis 821 46 1,469ms 14 Aug 2025 First Prev 561–640 of 4,397 Next Last