The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Fibonacci 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 387th pardouin 🇫🇷 965 23 1,296ms 11 Apr 2025 387th DialFrost 🇸🇬 965 23 1,245ms 13 Apr 2025 387th fuzzylojik-golf 🇺🇸 965 23 1,255ms 13 Sep 2025 387th GolfingSuccess 🇬🇷 965 23 1,175ms 14 days ago 405th Lydxn 🇨🇦 965 30 2ms 19 Jan 2022 405th sisyphus-ppcg 🇦🇺 965 30 1ms 19 Jan 2022 405th primo-ppcg 🇹🇭 965 30 2ms 19 Jan 2022 405th dvargas46 🇺🇸 965 30 1ms 26 Jun 2022 405th saito-ta 🇯🇵 965 30 1ms 6 Oct 2022 405th Steffan153 🇫🇮 965 30 1ms 12 Feb 2026 411th achimkrause 965 35 114ms 11 Jul 2018 411th HPWiz 🇳🇿 965 35 122ms 17 Jul 2018 411th yanqui-uxo 965 35 122ms 6 Oct 2018 411th laikoni 965 35 112ms 27 Feb 2019 411th kops-cg 965 35 296ms 8 Apr 2021 411th xnor-gate 965 35 120ms 8 Apr 2021 411th sisyphus-ppcg 🇦🇺 965 35 117ms 3 May 2021 411th rak1507 🇬🇧 965 35 113ms 4 May 2021 411th lynn 965 35 119ms 5 Jun 2021 411th ssiquoya 🇷🇺 965 35 140ms 9 Jun 2021 411th Lydxn 🇨🇦 965 35 116ms 12 Jul 2021 411th JayXon 🇺🇸 965 35 117ms 15 Sep 2021 411th annaproxy 965 35 117ms 4 Jan 2022 411th btnlq 965 35 117ms 4 Feb 2022 411th arjanadriaanse 🇳🇱 965 35 123ms 10 Feb 2022 411th ovs-code 🇩🇪 965 35 130ms 6 Mar 2022 411th GrayJoKing 🇦🇺 965 35 115ms 10 Mar 2022 411th Sakisan 🇧🇪 965 35 119ms 5 Apr 2022 411th Shanethegamer 🇺🇸 965 35 120ms 7 Apr 2022 411th Steffan153 🇫🇮 965 35 121ms 17 Dec 2022 411th betaveros 965 35 124ms 4 Jan 2023 411th ashtraypettingzoo 🇺🇸 965 35 121ms 10 Feb 2023 411th aionescu 965 35 125ms 9 Apr 2023 411th sean-niemann 🇺🇸 965 35 114ms 1 Jul 2023 411th TrueBoxGuy 965 35 122ms 10 Aug 2023 411th stackofbears 965 35 114ms 9 Sep 2023 411th Natanaelel 🇸🇪 965 35 119ms 10 Jan 2024 411th orthoplex 🇨🇽 965 35 131ms 25 Jul 2024 411th DialFrost 🇸🇬 965 35 120ms 5 Aug 2024 411th pardouin 🇫🇷 965 35 117ms 22 Sep 2024 411th 09cf 965 35 118ms 9 May 2025 411th fuzzylojik-golf 🇺🇸 965 35 125ms 11 Sep 2025 411th edsrzf 🇳🇿 965 35 134ms 20 Dec 2025 444th Lydxn 🇨🇦 965 51 402ms 21 Nov 2021 444th billings7 🇬🇧 965 51 378ms 21 Nov 2021 444th JayXon 🇺🇸 965 51 399ms 21 Nov 2021 444th jwalaszek 965 51 388ms 21 Nov 2021 444th Kloppermand 🇩🇰 965 51 415ms 21 Nov 2021 444th lynn 965 51 397ms 21 Nov 2021 444th MatheusAvellar 🇧🇷 965 51 354ms 21 Nov 2021 444th Meowsan91 🇨🇿 965 51 384ms 21 Nov 2021 444th MeWhenI 🇻🇦 965 51 380ms 21 Nov 2021 444th mrondon8 965 51 397ms 21 Nov 2021 444th NewDefectus 🇮🇱 965 51 384ms 21 Nov 2021 444th nwellnhof 🇩🇪 965 51 384ms 21 Nov 2021 444th primo-ppcg 🇹🇭 965 51 368ms 21 Nov 2021 444th sean-niemann 🇺🇸 965 51 382ms 21 Nov 2021 444th shellbertt 🇨🇦 965 51 379ms 21 Nov 2021 444th sisyphus-ppcg 🇦🇺 965 51 373ms 21 Nov 2021 444th ssiquoya 🇷🇺 965 51 375ms 21 Nov 2021 444th thestretivibity 965 51 372ms 21 Nov 2021 444th tomtheisen 🇺🇸 965 51 386ms 21 Nov 2021 444th Trickermand 965 51 388ms 21 Nov 2021 444th voytasify 🇵🇱 965 51 384ms 21 Nov 2021 444th btnlq 965 51 390ms 28 Nov 2021 444th prplz 🇦🇺 965 51 384ms 7 Jan 2022 444th GrayJoKing 🇦🇺 965 51 376ms 17 Oct 2022 444th DialFrost 🇸🇬 965 51 365ms 7 Jan 2023 444th Steffan153 🇫🇮 965 51 380ms 28 Jan 2023 444th peeveen 🇬🇧 965 51 387ms 15 Sep 2023 444th Herbert00709 🇵🇱 965 51 372ms 18 Nov 2023 444th roupiq 🇵🇱 965 51 377ms 19 Feb 2024 444th Mandrzejy 🇵🇱 965 51 351ms 27 Mar 2024 444th jipsong 🇩🇪 965 51 392ms 13 Jun 2024 444th namelessiw 965 51 390ms 13 Jun 2024 444th Jacob385 965 51 381ms 30 Jul 2024 444th pardouin 🇫🇷 965 51 435ms 24 Sep 2024 444th stefangimmillaro 965 51 438ms 24 Sep 2024 444th b-illy 🇬🇧 965 51 383ms 17 Jan 2025 444th Yax42 🇫🇷 965 51 439ms 6 Feb 2025 First Prev 401–480 of 9,821 Next Last