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 bytes. 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 Bytes Time Submitted 150th NewDefectus 🇮🇱 957 41 10ms 31 Jan 2022 150th rak1507 🇬🇧 957 41 10ms 23 Feb 2022 150th neihousaigaai 957 41 10ms 6 Mar 2022 150th HamzaM3 957 41 9ms 6 Mar 2022 150th jared-hughes 957 41 10ms 8 Apr 2022 150th rucin93 🇵🇱 957 41 10ms 26 May 2022 150th Steffan153 🇫🇮 957 41 10ms 24 Sep 2022 150th emplv 🇱🇻 957 41 10ms 27 Sep 2022 150th AlephSquirrel 957 41 12ms 7 Jan 2023 150th randolchance 957 41 10ms 19 Jan 2023 150th DialFrost 🇸🇬 957 41 11ms 23 Jan 2023 150th prplz 🇦🇺 957 41 9ms 26 Jan 2023 150th sean-niemann 🇺🇸 957 41 10ms 26 Jan 2023 150th xsot 🇸🇬 957 41 10ms 20 May 2023 150th stefangimmillaro 957 41 10ms 12 Jun 2023 150th Argeento 🇵🇱 957 41 11ms 25 Aug 2023 150th ovs-code 🇩🇪 957 41 9ms 29 Sep 2023 150th lukegustafson 🇺🇸 957 41 10ms 13 Nov 2023 150th helbling 🇨🇭 957 41 10ms 17 May 2024 150th vlpx 🇫🇮 957 41 11ms 18 Jun 2024 150th pardouin 🇫🇷 957 41 11ms 4 Aug 2024 150th emgordon154 957 41 10ms 19 Sep 2024 150th edsrzf 🇳🇿 957 41 14ms 19 Nov 2024 150th fuzzylojik-golf 🇺🇸 957 41 10ms 15 May 2025 150th b-illy 🇬🇧 957 41 10ms 2 Jul 2025 150th Yax42 🇫🇷 957 41 10ms 5 Sep 2025 150th CaedenHarper 🇨🇦 957 41 9ms 30 Oct 2025 150th snoozingnewt 🇨🇦 957 41 10ms 21 Nov 2025 150th Lv0Sys 🇵🇱 957 41 10ms 6 Dec 2025 190th andersk 🇺🇸 953 45 11ms 25 Oct 2022 190th FlorianCassayre 🇫🇷 953 45 9ms 16 Sep 2023 190th Command-Master 953 45 12ms 23 Sep 2023 190th cesarm4 953 45 9ms 29 Nov 2023 190th Natanaelel 🇸🇪 953 45 11ms 3 Jan 2024 190th klixel 🇨🇦 953 45 11ms 18 Nov 2024 196th Lydxn 🇨🇦 951 32 246ms 29 Jan 2022 196th btnlq 951 32 305ms 29 Jan 2022 196th sisyphus-ppcg 🇦🇺 951 32 253ms 2 Feb 2022 199th ovs-code 🇩🇪 943 41 405ms 15 Jan 2024 199th DialFrost 🇸🇬 943 41 390ms 15 Jan 2024 199th GolfingSuccess 🇬🇷 943 41 391ms 15 Jan 2024 199th inventshah 943 41 433ms 15 Jan 2024 199th Lydxn 🇨🇦 943 41 422ms 16 Jan 2024 199th sean-niemann 🇺🇸 943 41 362ms 16 Jan 2024 199th Steffan153 🇫🇮 943 41 338ms 16 Jan 2024 199th JayXon 🇺🇸 943 41 405ms 18 Jan 2024 199th Shanethegamer 🇺🇸 943 41 409ms 18 Jan 2024 199th kg583 🇺🇸 943 41 465ms 19 Jan 2024 199th orthoplex 🇨🇽 943 41 436ms 20 Jan 2024 199th m-tkach 🇺🇦 943 41 431ms 21 Jan 2024 199th xsot 🇸🇬 943 41 397ms 25 Jan 2024 199th lynn 943 41 381ms 17 Feb 2024 199th MeWhenI 🇻🇦 943 41 395ms 24 May 2024 199th duckyluuk 🇳🇱 943 41 405ms 17 Jun 2024 199th pardouin 🇫🇷 943 41 437ms 21 Jun 2024 199th emgordon154 943 41 427ms 20 Sep 2024 199th Mukundan314 943 41 416ms 16 Jun 2025 199th b-illy 🇬🇧 943 41 390ms 2 Jul 2025 199th fuzzylojik-golf 🇺🇸 943 41 444ms 3 Jul 2025 199th CaedenHarper 🇨🇦 943 41 392ms 30 Oct 2025 199th snoozingnewt 🇨🇦 943 41 444ms 21 Nov 2025 199th Babafaba 943 41 421ms 26 Nov 2025 199th CornerMercury 🇬🇧 943 41 388ms 17 Dec 2025 224th Lydxn 🇨🇦 941 40 221ms 29 Jan 2022 224th JayXon 🇺🇸 941 40 233ms 29 Jan 2022 224th HPWiz 🇳🇿 941 40 208ms 30 Jan 2022 224th antimon2 🇯🇵 941 40 486ms 5 Sep 2022 224th Steffan153 🇫🇮 941 40 251ms 19 Mar 2023 224th sisyphus-ppcg 🇦🇺 941 40 178ms 20 Mar 2023 224th ovs-code 🇩🇪 941 40 199ms 11 Apr 2023 224th p-zubieta 941 40 521ms 25 Sep 2023 224th DialFrost 🇸🇬 941 40 189ms 2 Jan 2024 224th sean-niemann 🇺🇸 941 40 233ms 12 Mar 2025 234th GrayJoKing 🇦🇺 936 21 44ms 28 Jul 2022 234th ovs-code 🇩🇪 936 21 41ms 2 Feb 2024 234th xsot 🇸🇬 936 21 40ms 9 Jun 2024 234th pardouin 🇫🇷 936 21 40ms 11 Oct 2024 234th CornerMercury 🇬🇧 936 21 39ms 4 days ago 239th Shanethegamer 🇺🇸 935 22 35ms 29 Jan 2022 239th scpchicken 🇵🇼 935 22 35ms 29 Jan 2022 First Prev 161–240 of 2,065 Next Last