The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Fizz Buzz in C 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 319th aliakseikalosha 774 93 2ms 22 Apr 2022 319th Us1ngTh3Hub 774 93 1ms 21 Jun 2023 319th Szum123321 🇵🇱 774 93 1ms 25 Nov 2023 324th AndreaNeti 766 94 1ms 29 Oct 2019 324th ian-h-chamberlain 🇺🇸 766 94 1ms 6 Jan 2020 324th osmith93 766 94 2ms 12 Dec 2020 324th scanlime 766 94 2ms 29 Dec 2020 324th Indivicivet 766 94 1ms 23 Mar 2021 324th akshatj27 🇦🇶 766 94 1ms 11 Jan 2022 324th lovernj 766 94 2ms 23 Feb 2022 324th bwenstar 766 94 1ms 11 Aug 2022 324th shibacho 🇯🇵 766 94 2ms 5 Dec 2022 324th KenanHanke 766 94 1ms 19 Feb 2023 324th mnbvczx 🇰🇷 766 94 1ms 12 Mar 2023 324th GolfingSuccess 🇬🇷 766 94 2ms 28 Sep 2023 324th qrakhen 766 94 2ms 13 Nov 2025 324th zgialor-lab 766 94 2ms 22 hours ago 338th elttil 758 95 1ms 21 Feb 2021 338th wansacis 🇩🇪 758 95 1ms 25 Jul 2021 338th ColesHoles 758 95 1ms 1 Oct 2021 338th tegenton 758 95 1ms 1 Oct 2021 338th InigoK 🇺🇸 758 95 1ms 13 Oct 2021 338th ColeBardin 758 95 1ms 30 Jul 2022 338th yzhs 🇩🇪 758 95 2ms 23 Jun 2023 338th MoveCloudROY 758 95 2ms 18 Jan 2024 338th LHLaurini 🇧🇷 758 95 2ms 1 May 2024 338th Flying-Toast 758 95 1ms 14 May 2024 338th nomennescio 758 95 1ms 7 Dec 2024 338th ChausseBenjamin 🇨🇦 758 95 2ms 24 Apr 2025 338th RYSF13 🇨🇳 758 95 1ms 27 Jun 2025 338th frankgraziano 758 95 1ms 15 Aug 2025 352nd Re-Adventures 🇮🇳 750 96 2ms 10 Sep 2020 352nd ZachClayburn 750 96 1ms 4 Aug 2022 352nd cmayer777 750 96 1ms 16 Oct 2022 352nd Xbot781 750 96 1ms 12 Aug 2023 356th alexkunin 742 97 1ms 10 Jul 2019 356th dtjanaka 742 97 1ms 23 Jun 2020 356th ryguyNelson 742 97 1ms 26 Dec 2020 356th deltronix 742 97 2ms 5 Apr 2021 356th heypwesto 🇳🇿 742 97 1ms 12 Apr 2021 356th Xwilarg 🇫🇷 742 97 1ms 16 Nov 2021 356th Quintar 742 97 2ms 12 Nov 2022 356th Leftykap 742 97 2ms 3 Mar 2023 356th aevykt 742 97 1ms 29 Oct 2023 356th owen-c-parker 🇺🇸 742 97 1ms 25 Oct 2024 366th Chesium 735 98 2ms 5 Aug 2020 366th maggym00 735 98 1ms 25 Mar 2021 366th tomasskare 735 98 1ms 6 Dec 2021 366th Anonymousellama21 735 98 2ms 14 Apr 2022 366th p4ck3t0 735 98 2ms 12 Nov 2022 366th NJRist 🇺🇸 735 98 1ms 24 Nov 2022 366th violeta-desantis 735 98 1ms 20 Sep 2023 366th DevinJFarmer 735 98 1ms 29 Oct 2023 366th Aurel300 🇨🇭 735 98 2ms 15 Jul 2024 366th Itron-al-Lenn 735 98 2ms 28 Oct 2024 376th mtrazzi 727 99 1ms 23 Oct 2020 376th SnivyLlama 727 99 1ms 13 Jan 2024 376th jbjd 727 99 2ms 16 Feb 2024 376th ComputerKWasTaken 🇺🇸 727 99 2ms 20 Jan 2025 376th mhgockel 727 99 1ms 22 Jun 2025 376th Efgeen 🇸🇪 727 99 1ms 17 Nov 2025 382nd rosvik 🇳🇴 720 100 2ms 29 Apr 2020 382nd dvora124 720 100 1ms 22 Dec 2020 382nd jhunterkohler 720 100 2ms 20 May 2021 382nd Evoniuk 720 100 1ms 31 May 2021 382nd olivia-weiss 🇺🇸 720 100 2ms 22 Oct 2021 382nd nwdamgaard 720 100 1ms 19 Dec 2021 382nd nick99nack 720 100 1ms 13 Feb 2022 382nd S-Ruban 720 100 1ms 26 Feb 2023 382nd MistMech 720 100 2ms 29 Oct 2023 382nd ciberjm 720 100 1ms 10 Jun 2024 382nd h3ra993huskp 🇯🇵 720 100 2ms 15 Aug 2025 393rd ganeshalamuru 713 101 1ms 28 Aug 2020 393rd eunhyulkim 713 101 1ms 7 Nov 2020 393rd furokku 713 101 2ms 14 Feb 2021 393rd Camto 713 101 1ms 28 Apr 2021 393rd lemogne 713 101 2ms 16 Nov 2021 393rd DrPiranoid 713 101 1ms 27 Oct 2022 393rd vzsky 713 101 2ms 9 Nov 2022 393rd olivermrose 🇺🇸 713 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