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 477th dokutan 899 43 412ms 26 Feb 2026 482nd GrayJoKing 🇦🇺 899 48 140ms 13 Aug 2024 482nd pardouin 🇫🇷 899 48 130ms 22 Sep 2024 484th primo-ppcg 🇹🇭 898 51 119ms 29 Jan 2022 484th the-zammers 898 51 121ms 18 Jan 2024 484th MeWhenI 🇻🇦 898 51 119ms 22 Mar 2024 484th tobeannouncd 898 51 122ms 9 Aug 2024 484th jipsong 🇩🇪 898 51 119ms 11 Feb 2025 484th snoozingnewt 🇨🇦 898 51 118ms 3 Dec 2025 490th Shanethegamer 🇺🇸 896 42 429ms 20 Feb 2023 490th tidalDisruptionEvent 🇨🇦 896 42 316ms 20 Mar 2023 490th alemelis 896 42 307ms 12 Apr 2023 490th Yewzir 🇧🇪 896 42 283ms 14 Feb 2024 490th BREMAUCY 🇫🇷 896 42 426ms 22 Apr 2024 490th snoozingnewt 🇨🇦 896 42 441ms 3 Dec 2025 496th ovs-code 🇩🇪 896 45 1,590ms 30 Nov 2022 496th HPWiz 🇳🇿 896 45 24ms 2 Feb 2023 498th GrayJoKing 🇦🇺 896 50 10ms 29 Jan 2022 498th annaproxy 896 50 14ms 29 Jan 2022 498th primo-ppcg 🇹🇭 896 50 10ms 30 Jan 2022 498th Steffan153 🇫🇮 896 50 9ms 24 Sep 2022 498th IanUtley 896 50 14ms 14 Nov 2023 498th ovs-code 🇩🇪 896 50 15ms 30 Jun 2024 504th GolfingSuccess 🇬🇷 896 131 291ms 15 Aug 2025 504th targrik 896 131 298ms 27 Aug 2025 506th primo-ppcg 🇹🇭 895 34 238ms 29 Jan 2022 506th Shanethegamer 🇺🇸 895 34 259ms 29 Jan 2022 506th Steffan153 🇫🇮 895 34 225ms 19 Dec 2022 506th MeWhenI 🇻🇦 895 34 254ms 28 Jan 2023 506th DialFrost 🇸🇬 895 34 258ms 23 Dec 2023 506th pardouin 🇫🇷 895 34 242ms 22 Sep 2024 506th fuzzylojik-golf 🇺🇸 895 34 272ms 21 Sep 2025 506th GolfingSuccess 🇬🇷 895 34 257ms 7 Feb 2026 506th madex 🇩🇪 895 34 237ms 11 days ago 515th CaedenHarper 🇨🇦 894 22 41ms 9 days ago 516th jhfranklin 🇬🇧 894 23 34ms 11 Feb 2022 517th clementblaudeau 893 48 10ms 29 Jun 2022 517th shelerr 893 48 10ms 14 Jul 2022 517th idoweinstein 893 48 9ms 4 Aug 2022 517th jakobkordez 🇸🇮 893 48 9ms 6 Nov 2022 517th M0PKOBKA 893 48 9ms 26 Dec 2022 517th Fracture17 893 48 9ms 17 Apr 2023 517th falsidge 893 48 10ms 15 Jun 2023 517th fourth-bit 893 48 10ms 24 Jun 2023 517th adamnielson42 🇺🇸 893 48 9ms 17 Aug 2023 517th mathisfun271 893 48 9ms 22 Dec 2023 517th logvp 893 48 10ms 30 Dec 2023 517th minhtrancccp 893 48 9ms 11 Jan 2024 517th inverseLorentz 🇦🇺 893 48 10ms 1 Apr 2024 517th Yewzir 🇧🇪 893 48 10ms 7 May 2024 517th abcdhhhh 893 48 10ms 25 Aug 2024 517th Languag3 893 48 10ms 3 Mar 2025 517th albanian-laundromat 893 48 10ms 26 Apr 2025 517th swtchblade 893 48 9ms 12 Jul 2025 517th CommandLeo 🇮🇹 893 48 11ms 11 Nov 2025 536th uttumuttu 🇫🇮 892 44 10ms 6 Mar 2022 536th janbehrens 🇩🇪 892 44 9ms 24 Apr 2023 536th two-bad 🇬🇧 892 44 10ms 25 Feb 2024 536th targrik 892 44 11ms 15 Feb 2025 536th alexsave 892 44 11ms 6 Nov 2025 536th JOrE20 892 44 11ms 13 Feb 2026 542nd MeWhenI 🇻🇦 892 55 1,176ms 8 Jun 2023 542nd pardouin 🇫🇷 892 55 1,269ms 23 Apr 2025 542nd snoozingnewt 🇨🇦 892 55 1,344ms 3 Dec 2025 545th JayXon 🇺🇸 891 76 2,478ms 8 Nov 2024 545th pardouin 🇫🇷 891 76 2,631ms 30 Nov 2024 547th kumavale 891 135 136ms 20 Dec 2025 547th acotis 891 135 144ms 17 Feb 2026 549th Lydxn 🇨🇦 889 132 301ms 27 Feb 2023 550th canissimia 🇦🇶 889 222 303ms 24 Mar 2024 551st xsot 🇸🇬 887 140 702ms 19 Jun 2025 552nd edsrzf 🇳🇿 886 57 40ms 14 Jan 2025 552nd GolfingSuccess 🇬🇷 886 57 37ms 9 Feb 2026 552nd Steffan153 🇫🇮 886 57 37ms 12 Feb 2026 555th GolfingSuccess 🇬🇷 886 65 6ms 22 Feb 2026 555th Steffan153 🇫🇮 886 65 7ms 22 Feb 2026 555th DialFrost 🇸🇬 886 65 6ms 22 Feb 2026 555th edsrzf 🇳🇿 886 65 7ms 22 Feb 2026 555th GrayJoKing 🇦🇺 886 65 7ms 23 Feb 2026 555th emgordon154 886 65 6ms 25 days ago First Prev 481–560 of 2,065 Next Last