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?
Quine 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 66th Radwatch 514 74 2ms 14 Jul 2022 66th retrohun 514 74 1ms 3 Jan 2023 66th adaGrad1 514 74 1ms 6 Sep 2023 66th kkoenig 514 74 2ms 18 Dec 2023 66th volpi-m 🇫🇷 514 74 1ms 19 Mar 2024 66th Noam527 514 74 1ms 28 Mar 2024 66th Vinterion 514 74 1ms 17 Jun 2024 66th esckbd 514 74 2ms 6 Jul 2024 66th sjrct 514 74 1ms 5 Aug 2024 66th emgordon154 514 74 1ms 8 Nov 2024 66th h-hh-hhh 🇺🇦 514 74 1ms 17 Nov 2024 66th wh3n3v3r 🇨🇿 514 74 1ms 17 Nov 2024 66th plcc0 514 74 1ms 20 Feb 2025 66th voytxt 🇨🇿 514 74 2ms 24 Feb 2025 66th heanyang1 514 74 1ms 20 Apr 2025 66th RYSF13 🇨🇳 514 74 1ms 17 May 2025 66th xiaoyiming123 514 74 1ms 23 Jul 2025 66th Bpc-CPU 514 74 1ms 23 Jul 2025 66th Mabeloid 🇳🇴 514 74 1ms 21 Oct 2025 66th luuumine 🇫🇷 514 74 2ms 10 Nov 2025 101st byronknoll 🇺🇸 507 75 2ms 21 Jan 2024 102nd jngbsn 500 76 1ms 2 Mar 2019 102nd Starwort 🇬🇧 500 76 1ms 21 Mar 2019 102nd villfa 500 76 1ms 26 Apr 2019 102nd ElevatorShaft 500 76 1ms 19 Jun 2019 102nd ramytarchichy 500 76 1ms 23 Jun 2019 102nd AgathokakologicalBit 500 76 1ms 14 Jul 2019 102nd AkashTandon167 500 76 2ms 15 Oct 2019 102nd guliyevemil1 🇦🇿 500 76 1ms 20 Apr 2020 102nd AlephSquirrel 500 76 1ms 11 May 2020 102nd alexjlaberge 500 76 1ms 22 Jun 2020 102nd xor-shift 500 76 1ms 24 Jun 2020 102nd vinnnnncent 500 76 1ms 28 Jun 2020 102nd bac0id 500 76 1ms 11 Jul 2020 102nd ToriTheChicken 500 76 1ms 31 Jul 2020 102nd thisishowmymindworks 🇳🇴 500 76 2ms 31 Jul 2020 102nd Chesium 500 76 1ms 6 Aug 2020 102nd rucin93 🇵🇱 500 76 1ms 7 Sep 2020 102nd marshallku 🇰🇷 500 76 1ms 12 Sep 2020 102nd BenAns 500 76 1ms 26 Sep 2020 102nd orthoplex 🇨🇽 500 76 1ms 4 Oct 2020 102nd djeedjay 🇳🇱 500 76 2ms 13 Oct 2020 102nd ReidZ3 🇺🇸 500 76 1ms 4 Dec 2020 102nd BBoehm 🇩🇪 500 76 1ms 10 Feb 2021 102nd furokku 500 76 1ms 12 Feb 2021 102nd ForkKILLET 🇨🇳 500 76 2ms 18 Feb 2021 102nd poojan2312 500 76 1ms 27 Feb 2021 102nd 094-gengar 🇯🇵 500 76 1ms 25 Mar 2021 102nd neihousaigaai 500 76 1ms 5 Apr 2021 102nd nsauzede 500 76 1ms 10 Apr 2021 102nd MeWhenI 🇻🇦 500 76 1ms 17 Apr 2021 102nd baby-steve 500 76 1ms 5 May 2021 102nd GameChaos 500 76 1ms 14 May 2021 102nd urojony 🇵🇱 500 76 1ms 26 May 2021 102nd silvncr 500 76 1ms 15 Jun 2021 102nd c0d3-4-F00d 🇩🇪 500 76 2ms 19 Jun 2021 102nd mokymok 🇺🇸 500 76 1ms 22 Jul 2021 102nd RYNO8 500 76 1ms 8 Aug 2021 102nd Jonatan6 🇩🇰 500 76 1ms 29 Aug 2021 102nd olivermrose 🇺🇸 500 76 2ms 29 Aug 2021 102nd Spruill-1 500 76 1ms 12 Sep 2021 102nd benwilliamgraham 500 76 1ms 24 Oct 2021 102nd shellbertt 🇨🇦 500 76 1ms 3 Nov 2021 102nd Bonjour27891 🇻🇳 500 76 1ms 27 Jan 2022 102nd CedricGebistorf 500 76 1ms 10 Feb 2022 102nd guilhem-roy 🇫🇷 500 76 1ms 23 Feb 2022 102nd TornadoCookie 500 76 1ms 9 Apr 2022 102nd EthanGrant1 500 76 2ms 21 Apr 2022 102nd Jasper-Ty 🇵🇭 500 76 1ms 23 Apr 2022 102nd Natanaelel 🇸🇪 500 76 2ms 23 Apr 2022 102nd VictorFordham 500 76 1ms 13 Jun 2022 102nd iakolzin 500 76 1ms 1 Jul 2022 102nd michael-pruglo 🇺🇦 500 76 2ms 6 Jul 2022 102nd james-downey 500 76 1ms 9 Jul 2022 102nd matteodelabre 500 76 1ms 15 Sep 2022 102nd pyuraii 500 76 1ms 27 Sep 2022 102nd jupj 🇫🇮 500 76 1ms 14 Oct 2022 102nd 4hg 🇺🇸 500 76 1ms 17 Oct 2022 102nd slerpyyy 🇩🇪 500 76 1ms 21 Oct 2022 102nd trist224 🇫🇷 500 76 1ms 28 Nov 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