The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 867th emgordon154 947 70 54ms 1 Jun 2025 867th IntOverflow-maxwell 947 70 64ms 26 Aug 2025 867th timhaj 🇸🇮 947 70 55ms 12 Sep 2025 867th LordSir101 947 70 59ms 17 Sep 2025 867th Zounon 947 70 66ms 18 Sep 2025 867th qpwoeirut 947 70 64ms 14 Oct 2025 867th CaedenHarper 🇨🇦 947 70 61ms 30 Oct 2025 888th Kacarott 🇦🇺 946 26 63ms 9 Dec 2025 888th GrayJoKing 🇦🇺 946 26 64ms 9 Dec 2025 888th error256 946 26 61ms 10 Dec 2025 891st Attero 🇸🇪 946 52 371ms 21 Nov 2021 891st BBoehm 🇩🇪 946 52 378ms 21 Nov 2021 891st eldritchconundrum 946 52 387ms 21 Nov 2021 891st initram 946 52 376ms 21 Nov 2021 891st jakzo 946 52 390ms 21 Nov 2021 891st janbehrens 🇩🇪 946 52 377ms 21 Nov 2021 891st KatieLG 🇬🇧 946 52 413ms 21 Nov 2021 891st markdchurchill 946 52 344ms 21 Nov 2021 891st raphaelimahorn 946 52 367ms 21 Nov 2021 891st m-tkach 🇺🇦 946 52 392ms 2 Dec 2021 891st Irratix 🇳🇱 946 52 378ms 9 Dec 2021 891st SirBogman 🇺🇸 946 52 419ms 14 Dec 2021 891st ovs-code 🇩🇪 946 52 374ms 6 Jul 2022 891st Shanethegamer 🇺🇸 946 52 380ms 11 Jul 2022 891st tkr-sh 🇰🇵 946 52 395ms 14 Jul 2022 891st ZakkkkAttackkkk 🇵🇭 946 52 366ms 26 Jul 2022 891st 5quiwyrm 946 52 377ms 31 Aug 2022 891st Alex-x90 🇺🇸 946 52 385ms 17 Oct 2022 891st trist224 🇫🇷 946 52 384ms 9 Nov 2022 891st oceko 946 52 387ms 26 Nov 2022 891st astdefu 946 52 364ms 10 Dec 2022 891st Betuaredead 946 52 386ms 4 Jan 2023 891st Yewzir 🇧🇪 946 52 370ms 5 Feb 2023 891st adyache 🇺🇸 946 52 392ms 30 Apr 2023 891st speles 🇺🇦 946 52 388ms 12 Nov 2023 891st kkoenig 946 52 389ms 22 Dec 2023 891st voytxt 🇨🇿 946 52 383ms 26 Jan 2024 891st duckyluuk 🇳🇱 946 52 395ms 9 Apr 2024 891st error256 946 52 389ms 10 May 2024 891st CaedenHarper 🇨🇦 946 52 394ms 16 Jan 2025 891st wiz0u 946 52 368ms 18 Jan 2025 891st Natanaelel 🇸🇪 946 52 396ms 24 Jan 2025 891st emgordon154 946 52 379ms 1 Jun 2025 891st Maximizer02 946 52 349ms 17 Sep 2025 891st cmddog 946 52 403ms 17 Sep 2025 891st LordSir101 946 52 415ms 18 Sep 2025 891st albanian-laundromat 946 52 444ms 30 Oct 2025 891st Soyo-Wind 946 52 415ms 3 Nov 2025 891st solisolu 946 52 375ms 21 Nov 2025 891st Andrey2001 946 52 416ms 24 Nov 2025 891st KasperKivimaeki 🇫🇮 946 52 402ms 26 Nov 2025 891st Pyroan 946 52 392ms 17 Dec 2025 891st FlyingPenguin223 946 52 403ms 20 Jan 2026 934th primo-ppcg 🇹🇭 944 65 117ms 14 Jan 2022 934th scpchicken 🇵🇼 944 65 125ms 11 Jul 2022 934th tuomas56 944 65 125ms 7 Sep 2022 934th Super-Pizza 🇨🇦 944 65 127ms 5 Dec 2022 934th kgodara 944 65 126ms 7 Mar 2023 934th fisherdarling 944 65 131ms 13 Apr 2023 934th crispshaker 944 65 150ms 10 Jun 2023 934th btnlq 944 65 128ms 19 Jun 2023 934th prplz 🇦🇺 944 65 116ms 28 Jun 2023 934th sbercx 944 65 115ms 29 Jul 2023 934th funnsam 🇭🇰 944 65 127ms 23 Oct 2023 934th drabart 🇵🇱 944 65 124ms 11 Dec 2023 934th TylerBloom 944 65 123ms 22 Mar 2024 934th unfinishedprogram 944 65 134ms 3 May 2024 934th nullie 944 65 133ms 19 Dec 2024 934th dusmart 944 65 130ms 21 Feb 2025 934th zk524 944 65 130ms 24 Feb 2025 934th ijchen 944 65 131ms 18 Mar 2025 934th TannerJ07 🇺🇸 944 65 129ms 5 Apr 2025 934th aspiringLich 944 65 124ms 27 Oct 2025 934th snoozingnewt 🇨🇦 944 65 133ms 2 Dec 2025 934th Heathcorp 🇦🇺 944 65 126ms 1 Feb 2026 956th primo-ppcg 🇹🇭 943 42 1,260ms 30 Nov 2021 956th JayXon 🇺🇸 943 42 1,290ms 30 Nov 2021 956th GrayJoKing 🇦🇺 943 42 1,343ms 30 Nov 2021 956th btnlq 943 42 1,278ms 30 Nov 2021 956th Lydxn 🇨🇦 943 42 1,336ms 30 Nov 2021 First Prev 881–960 of 9,824 Next Last