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?
Catalan 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 401st JayXon 🇺🇸 903 130 287ms 8 Feb 2022 401st nwellnhof 🇩🇪 903 130 299ms 3 Jun 2022 401st kkoenig 903 130 279ms 6 Sep 2025 404th kg583 🇺🇸 902 56 38ms 4 Apr 2025 404th zacjl 902 56 39ms 16 May 2025 406th Lydxn 🇨🇦 902 69 483ms 14 Jul 2023 406th JayXon 🇺🇸 902 69 474ms 14 Jul 2023 406th fuzzylojik-golf 🇺🇸 902 69 457ms 20 Sep 2025 406th sean-niemann 🇺🇸 902 69 483ms 21 Sep 2025 406th Steffan153 🇫🇮 902 69 678ms 14 Feb 2026 411th HPWiz 🇳🇿 902 127 4ms 4 May 2025 412th GrayJoKing 🇦🇺 901 43 68ms 9 Dec 2025 413th Shanethegamer 🇺🇸 901 55 1,318ms 29 Jan 2022 413th GrayJoKing 🇦🇺 901 55 1,360ms 17 Oct 2023 413th jipsong 🇩🇪 901 55 1,303ms 30 Jun 2024 416th JayXon 🇺🇸 901 122 461ms 5 May 2024 416th ovs-code 🇩🇪 901 122 492ms 5 May 2024 418th edsrzf 🇳🇿 900 39 752ms 30 Aug 2025 418th DialFrost 🇸🇬 900 39 1,025ms 2 Sep 2025 418th CaedenHarper 🇨🇦 900 39 1,166ms 30 Oct 2025 418th xsot 🇸🇬 900 39 695ms 16 Nov 2025 418th pardouin 🇫🇷 900 39 995ms 1 Dec 2025 418th GolfingSuccess 🇬🇷 900 39 740ms 20 Jan 2026 418th kg583 🇺🇸 900 39 744ms 20 Jan 2026 418th dokutan 900 39 694ms 26 Feb 2026 426th rucin93 🇵🇱 900 47 139ms 3 Aug 2024 427th ovs-code 🇩🇪 899 41 405ms 15 Jan 2024 427th DialFrost 🇸🇬 899 41 390ms 15 Jan 2024 427th GolfingSuccess 🇬🇷 899 41 391ms 15 Jan 2024 427th inventshah 899 41 433ms 15 Jan 2024 427th JayXon 🇺🇸 899 41 405ms 18 Jan 2024 427th Shanethegamer 🇺🇸 899 41 409ms 18 Jan 2024 427th kg583 🇺🇸 899 41 465ms 19 Jan 2024 427th orthoplex 🇨🇽 899 41 436ms 20 Jan 2024 427th m-tkach 🇺🇦 899 41 431ms 21 Jan 2024 427th xsot 🇸🇬 899 41 397ms 25 Jan 2024 427th lynn 899 41 381ms 17 Feb 2024 427th MeWhenI 🇻🇦 899 41 395ms 24 May 2024 427th duckyluuk 🇳🇱 899 41 405ms 17 Jun 2024 427th pardouin 🇫🇷 899 41 437ms 21 Jun 2024 427th emgordon154 899 41 427ms 20 Sep 2024 427th Mukundan314 899 41 416ms 16 Jun 2025 427th b-illy 🇬🇧 899 41 390ms 2 Jul 2025 427th fuzzylojik-golf 🇺🇸 899 41 408ms 3 Jul 2025 427th CaedenHarper 🇨🇦 899 41 392ms 30 Oct 2025 427th snoozingnewt 🇨🇦 899 41 444ms 21 Nov 2025 427th Babafaba 899 41 421ms 26 Nov 2025 427th CornerMercury 🇬🇧 899 41 388ms 17 Dec 2025 449th primo-ppcg 🇹🇭 898 51 119ms 29 Jan 2022 449th the-zammers 898 51 121ms 18 Jan 2024 449th MeWhenI 🇻🇦 898 51 119ms 22 Mar 2024 449th tobeannouncd 898 51 122ms 9 Aug 2024 449th jipsong 🇩🇪 898 51 119ms 11 Feb 2025 449th snoozingnewt 🇨🇦 898 51 118ms 3 Dec 2025 455th GrayJoKing 🇦🇺 896 35 5ms 31 Jan 2022 456th primo-ppcg 🇹🇭 896 41 382ms 29 Jan 2022 456th Shanethegamer 🇺🇸 896 41 429ms 20 Feb 2023 456th tidalDisruptionEvent 🇨🇦 896 41 316ms 20 Mar 2023 456th alemelis 896 41 307ms 12 Apr 2023 456th Yewzir 🇧🇪 896 41 283ms 14 Feb 2024 456th BREMAUCY 🇫🇷 896 41 426ms 22 Apr 2024 456th snoozingnewt 🇨🇦 896 41 441ms 3 Dec 2025 463rd ovs-code 🇩🇪 896 45 1,590ms 30 Nov 2022 463rd HPWiz 🇳🇿 896 45 24ms 2 Feb 2023 465th GrayJoKing 🇦🇺 896 50 10ms 29 Jan 2022 465th annaproxy 896 50 14ms 29 Jan 2022 465th primo-ppcg 🇹🇭 896 50 10ms 30 Jan 2022 465th Steffan153 🇫🇮 896 50 9ms 24 Sep 2022 465th IanUtley 896 50 14ms 14 Nov 2023 465th ovs-code 🇩🇪 896 50 15ms 30 Jun 2024 471st GolfingSuccess 🇬🇷 896 131 291ms 15 Aug 2025 471st targrik 896 131 298ms 27 Aug 2025 473rd primo-ppcg 🇹🇭 895 34 238ms 29 Jan 2022 473rd Shanethegamer 🇺🇸 895 34 259ms 29 Jan 2022 473rd Steffan153 🇫🇮 895 34 225ms 19 Dec 2022 473rd MeWhenI 🇻🇦 895 34 254ms 28 Jan 2023 473rd DialFrost 🇸🇬 895 34 258ms 23 Dec 2023 473rd pardouin 🇫🇷 895 34 242ms 22 Sep 2024 473rd fuzzylojik-golf 🇺🇸 895 34 272ms 21 Sep 2025 473rd GolfingSuccess 🇬🇷 895 34 257ms 7 Feb 2026 First Prev 401–480 of 2,051 Next Last