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 321st itsh01 913 43 9ms 10 Feb 2022 321st 051 🇸🇬 913 43 11ms 19 Aug 2022 321st tayloia 🇬🇧 913 43 10ms 12 Jan 2023 321st eranws 913 43 10ms 8 Feb 2024 321st voytxt 🇨🇿 913 43 8ms 5 May 2024 321st Yewzir 🇧🇪 913 43 10ms 7 May 2024 321st dmrichwa 🇺🇸 913 43 10ms 22 Sep 2024 321st a6166231 🇨🇳 913 43 11ms 25 Apr 2025 321st dokutan 913 43 11ms 22 Sep 2025 330th Lydxn 🇨🇦 913 58 5ms 29 Jan 2022 330th primo-ppcg 🇹🇭 913 58 6ms 29 Jan 2022 330th AlephSquirrel 913 58 5ms 16 Jan 2023 330th ovs-code 🇩🇪 913 58 5ms 11 Mar 2023 330th varhammer 913 58 5ms 19 Oct 2024 330th kg583 🇺🇸 913 58 5ms 21 Oct 2024 330th CLOStrophobic 🇮🇹 913 58 6ms 17 Jan 2025 330th zacjl 913 58 5ms 21 Jan 2025 330th edsrzf 🇳🇿 913 58 6ms 8 Dec 2025 339th RYNO8 912 47 12ms 18 Feb 2022 339th TFeld00 🇩🇰 912 47 9ms 22 Apr 2022 339th LukasFolwarczny 🇨🇿 912 47 11ms 16 Sep 2022 339th commandz0 🇺🇸 912 47 9ms 18 Sep 2022 339th betaveros 912 47 12ms 30 Dec 2022 339th Just4FunCoder 912 47 11ms 23 Mar 2023 339th vishwathg 912 47 13ms 4 Apr 2023 339th Schreipfelerer 912 47 13ms 9 Apr 2023 339th quimey 912 47 12ms 23 Jun 2023 339th dranjohn 912 47 9ms 16 Sep 2023 339th keelimeguy 🇺🇸 912 47 11ms 16 Dec 2023 339th bob-th 912 47 12ms 22 Jan 2024 339th fgrosshans 🇫🇷 912 47 12ms 16 Jul 2024 339th moustave 912 47 12ms 4 Dec 2024 339th Bulmenisaurus 912 47 12ms 6 Feb 2025 339th xiaoyiming123 912 47 9ms 23 Jul 2025 339th InigoK 🇺🇸 912 47 9ms 9 Aug 2025 339th luuumine 🇫🇷 912 47 9ms 21 Nov 2025 339th Lv0Sys 🇵🇱 912 47 9ms 6 Dec 2025 339th anter69 🇭🇺 912 47 11ms 30 Jan 2026 359th fuzzylojik-golf 🇺🇸 912 119 462ms 24 Sep 2025 359th sean-niemann 🇺🇸 912 119 401ms 24 Sep 2025 359th JayXon 🇺🇸 912 119 453ms 25 Sep 2025 359th nwellnhof 🇩🇪 912 119 470ms 25 Sep 2025 359th Steffan153 🇫🇮 912 119 643ms 14 Feb 2026 364th clockworknazo 911 56 5ms 30 Sep 2022 364th Lydxn 🇨🇦 911 56 5ms 28 Feb 2023 364th error256 911 56 6ms 26 Oct 2024 364th zacjl 911 56 6ms 29 Oct 2024 364th edsrzf 🇳🇿 911 56 6ms 14 Jan 2025 364th Steffan153 🇫🇮 911 56 6ms 11 Feb 2026 370th Lydxn 🇨🇦 908 54 1,337ms 29 Jan 2022 370th lynn 908 54 1,261ms 29 Jan 2022 370th JayXon 🇺🇸 908 54 1,328ms 29 Jan 2022 370th primo-ppcg 🇹🇭 908 54 1,315ms 29 Jan 2022 370th Steffan153 🇫🇮 908 54 1,282ms 4 Jan 2023 370th Shanethegamer 🇺🇸 908 54 1,297ms 21 Feb 2023 370th DialFrost 🇸🇬 908 54 1,335ms 10 Mar 2025 370th sean-niemann 🇺🇸 908 54 1,311ms 18 Apr 2025 370th edsrzf 🇳🇿 908 54 1,358ms 31 Aug 2025 379th primo-ppcg 🇹🇭 907 80 388ms 29 Jan 2022 379th m-tkach 🇺🇦 907 80 382ms 31 Jan 2022 379th tomtheisen 🇺🇸 907 80 399ms 7 Feb 2023 379th stefangimmillaro 907 80 372ms 7 Jul 2023 379th namelessiw 907 80 410ms 5 Jun 2025 379th DialFrost 🇸🇬 907 80 392ms 8 Sep 2025 379th CaedenHarper 🇨🇦 907 80 433ms 30 Oct 2025 379th snoozingnewt 🇨🇦 907 80 409ms 3 Dec 2025 387th stefangimmillaro 904 120 617ms 6 Oct 2025 387th CaedenHarper 🇨🇦 904 120 442ms 10 Oct 2025 387th MeWhenI 🇻🇦 904 120 428ms 7 Nov 2025 390th annaproxy 903 34 34ms 29 Jan 2022 390th shinh 903 34 36ms 27 Jun 2022 390th anter69 🇭🇺 903 34 35ms 24 Jul 2022 390th janlelis 903 34 34ms 28 Aug 2022 394th GrayJoKing 🇦🇺 903 45 77ms 8 Jun 2022 394th Lydxn 🇨🇦 903 45 73ms 8 Jun 2022 394th pardouin 🇫🇷 903 45 77ms 3 Sep 2024 394th Steffan153 🇫🇮 903 45 103ms 14 Feb 2026 398th JayXon 🇺🇸 903 70 109ms 14 Oct 2022 398th Lydxn 🇨🇦 903 70 114ms 15 Oct 2022 398th Steffan153 🇫🇮 903 70 110ms 13 days ago First Prev 321–400 of 2,051 Next Last