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 865th IntOverflow-maxwell 947 70 64ms 26 Aug 2025 865th timhaj 🇸🇮 947 70 55ms 12 Sep 2025 865th LordSir101 947 70 59ms 17 Sep 2025 865th Zounon 947 70 66ms 18 Sep 2025 865th qpwoeirut 947 70 64ms 14 Oct 2025 865th CaedenHarper 🇨🇦 947 70 61ms 30 Oct 2025 887th Kacarott 🇦🇺 946 26 63ms 9 Dec 2025 887th GrayJoKing 🇦🇺 946 26 64ms 9 Dec 2025 887th error256 946 26 61ms 10 Dec 2025 890th Attero 🇸🇪 946 52 371ms 21 Nov 2021 890th BBoehm 🇩🇪 946 52 378ms 21 Nov 2021 890th eldritchconundrum 946 52 387ms 21 Nov 2021 890th initram 946 52 376ms 21 Nov 2021 890th jakzo 946 52 390ms 21 Nov 2021 890th janbehrens 🇩🇪 946 52 377ms 21 Nov 2021 890th KatieLG 🇬🇧 946 52 413ms 21 Nov 2021 890th markdchurchill 946 52 344ms 21 Nov 2021 890th raphaelimahorn 946 52 367ms 21 Nov 2021 890th m-tkach 🇺🇦 946 52 392ms 2 Dec 2021 890th Irratix 🇳🇱 946 52 378ms 9 Dec 2021 890th SirBogman 🇺🇸 946 52 419ms 14 Dec 2021 890th ovs-code 🇩🇪 946 52 374ms 6 Jul 2022 890th Shanethegamer 🇺🇸 946 52 380ms 11 Jul 2022 890th tkr-sh 🇰🇵 946 52 395ms 14 Jul 2022 890th ZakkkkAttackkkk 🇵🇭 946 52 366ms 26 Jul 2022 890th 5quiwyrm 946 52 377ms 31 Aug 2022 890th Alex-x90 🇺🇸 946 52 385ms 17 Oct 2022 890th trist224 🇫🇷 946 52 384ms 9 Nov 2022 890th oceko 946 52 387ms 26 Nov 2022 890th astdefu 946 52 364ms 10 Dec 2022 890th Betuaredead 946 52 386ms 4 Jan 2023 890th Yewzir 🇧🇪 946 52 370ms 5 Feb 2023 890th adyache 🇺🇸 946 52 392ms 30 Apr 2023 890th speles 🇺🇦 946 52 388ms 12 Nov 2023 890th kkoenig 946 52 389ms 22 Dec 2023 890th voytxt 🇨🇿 946 52 383ms 26 Jan 2024 890th duckyluuk 🇳🇱 946 52 395ms 9 Apr 2024 890th error256 946 52 389ms 10 May 2024 890th CaedenHarper 🇨🇦 946 52 394ms 16 Jan 2025 890th wiz0u 946 52 368ms 18 Jan 2025 890th Natanaelel 🇸🇪 946 52 396ms 24 Jan 2025 890th emgordon154 946 52 379ms 1 Jun 2025 890th Maximizer02 946 52 349ms 17 Sep 2025 890th cmddog 946 52 403ms 17 Sep 2025 890th LordSir101 946 52 415ms 18 Sep 2025 890th albanian-laundromat 946 52 444ms 30 Oct 2025 890th Soyo-Wind 946 52 415ms 3 Nov 2025 890th solisolu 946 52 375ms 21 Nov 2025 890th Andrey2001 946 52 416ms 24 Nov 2025 890th KasperKivimaeki 🇫🇮 946 52 402ms 26 Nov 2025 890th Pyroan 946 52 392ms 17 Dec 2025 890th FlyingPenguin223 946 52 403ms 20 Jan 2026 933rd primo-ppcg 🇹🇭 944 65 118ms 14 Jan 2022 933rd scpchicken 🇵🇼 944 65 123ms 11 Jul 2022 933rd tuomas56 944 65 131ms 7 Sep 2022 933rd Super-Pizza 🇨🇦 944 65 122ms 5 Dec 2022 933rd kgodara 944 65 128ms 7 Mar 2023 933rd fisherdarling 944 65 126ms 13 Apr 2023 933rd crispshaker 944 65 130ms 10 Jun 2023 933rd btnlq 944 65 126ms 19 Jun 2023 933rd prplz 🇦🇺 944 65 127ms 28 Jun 2023 933rd sbercx 944 65 126ms 29 Jul 2023 933rd funnsam 🇭🇰 944 65 119ms 23 Oct 2023 933rd drabart 🇵🇱 944 65 124ms 11 Dec 2023 933rd TylerBloom 944 65 121ms 22 Mar 2024 933rd unfinishedprogram 944 65 124ms 3 May 2024 933rd nullie 944 65 133ms 19 Dec 2024 933rd dusmart 944 65 127ms 21 Feb 2025 933rd zk524 944 65 131ms 24 Feb 2025 933rd ijchen 944 65 124ms 18 Mar 2025 933rd TannerJ07 🇺🇸 944 65 124ms 5 Apr 2025 933rd aspiringLich 944 65 130ms 27 Oct 2025 933rd snoozingnewt 🇨🇦 944 65 121ms 2 Dec 2025 933rd Heathcorp 🇦🇺 944 65 127ms 1 Feb 2026 955th primo-ppcg 🇹🇭 943 42 1,260ms 30 Nov 2021 955th JayXon 🇺🇸 943 42 1,290ms 30 Nov 2021 955th GrayJoKing 🇦🇺 943 42 1,343ms 30 Nov 2021 955th btnlq 943 42 1,278ms 30 Nov 2021 955th Lydxn 🇨🇦 943 42 1,336ms 30 Nov 2021 955th lynn 943 42 1,230ms 30 Nov 2021 First Prev 881–960 of 9,821 Next Last