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?
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 102nd aksyristos 500 76 1ms 1 Dec 2022 102nd neel11235813 500 76 1ms 2 Jan 2023 102nd annaproxy 500 76 2ms 8 Jan 2023 102nd ashtraypettingzoo 🇺🇸 500 76 1ms 13 Feb 2023 102nd ant1p4t1c4 🇲🇽 500 76 1ms 28 Feb 2023 102nd loganmacdougall 🇨🇦 500 76 1ms 2 Mar 2023 102nd LogicalJoe 500 76 1ms 20 Mar 2023 102nd Dominoscompute 500 76 2ms 20 Apr 2023 102nd klixel 🇨🇦 500 76 1ms 4 May 2023 102nd aubergine-sauce 500 76 1ms 26 May 2023 102nd lyphyser 500 76 1ms 3 Jun 2023 102nd funnsam 🇭🇰 500 76 1ms 10 Jun 2023 102nd jacobly0 🇺🇸 500 76 1ms 15 Aug 2023 102nd nyoshe 500 76 1ms 27 Sep 2023 102nd weliveinhell 🇭🇹 500 76 1ms 1 Oct 2023 102nd imma-Spring 500 76 1ms 21 Oct 2023 102nd gottschalktobias1998 500 76 1ms 30 Oct 2023 102nd Adrien-AM 500 76 1ms 8 Nov 2023 102nd HumanoidCPU 500 76 2ms 17 Nov 2023 102nd m42km 500 76 1ms 6 Jan 2024 102nd 1231234md5 🇨🇳 500 76 1ms 8 Jan 2024 102nd iilegacyyii 500 76 1ms 22 Jan 2024 102nd NickTheEASDude 🇺🇸 500 76 1ms 25 Jan 2024 102nd snoozingnewt 🇨🇦 500 76 2ms 18 Feb 2024 102nd roguh 🇬🇹 500 76 1ms 20 Feb 2024 102nd LHLaurini 🇧🇷 500 76 1ms 2 May 2024 102nd LorenzoDeGaspari 500 76 1ms 2 May 2024 102nd olleicua 🇺🇸 500 76 2ms 4 Jun 2024 102nd Ralac07 🇦🇺 500 76 1ms 4 Jul 2024 102nd rifatx 500 76 2ms 11 Jul 2024 102nd dokutan 500 76 1ms 13 Jul 2024 102nd LostSyntax21 🇬🇧 500 76 2ms 31 Aug 2024 102nd madeforlosers 500 76 2ms 20 Sep 2024 102nd Stockoh 🇫🇷 500 76 1ms 29 Sep 2024 102nd CaedenHarper 🇨🇦 500 76 1ms 13 Oct 2024 102nd nomennescio 500 76 1ms 9 Dec 2024 102nd shenziyiszy 500 76 1ms 10 Dec 2024 102nd snyderek 🇺🇸 500 76 1ms 4 Feb 2025 102nd JunkIce 500 76 2ms 26 Feb 2025 102nd nilan425 500 76 1ms 15 Apr 2025 102nd codewrite 🇬🇧 500 76 2ms 23 May 2025 102nd muser-logiccpu 🇺🇦 500 76 1ms 5 Aug 2025 102nd Soyo-Wind 500 76 2ms 18 Aug 2025 102nd Babafaba 500 76 2ms 24 Nov 2025 102nd yoikolover 500 76 2ms 11 Dec 2025 102nd CornerMercury 🇬🇧 500 76 2ms 6 Jan 2026 102nd Andrey2001 500 76 2ms 31 Jan 2026 102nd JOrE20 500 76 2ms 23 Feb 2026 102nd kasarino 500 76 2ms 10 days ago 102nd tsschepens 500 76 2ms 5 days ago 211th scpchicken 🇵🇼 494 77 1ms 28 Feb 2022 212th NatNgs 487 78 1ms 9 Jan 2020 212th ryguyNelson 487 78 1ms 26 Dec 2020 212th iannisdezwart 🇳🇱 487 78 1ms 21 Jun 2021 212th alichraghi 487 78 1ms 14 Oct 2021 212th two-bad 🇬🇧 487 78 1ms 5 Dec 2021 212th varhammer 487 78 2ms 31 Jan 2022 212th andre-de-lorde 487 78 1ms 14 Apr 2022 212th plainoldcheese 🇦🇶 487 78 2ms 23 Mar 2023 212th StHagel 487 78 1ms 3 Aug 2023 212th edsrzf 🇳🇿 487 78 1ms 23 Oct 2024 222nd ishan0102 475 80 1ms 17 May 2020 223rd AbhayAravinda 463 82 1ms 15 Aug 2020 224th TerenceTux 452 84 1ms 22 May 2023 225th mathisfun271 447 85 1ms 5 Mar 2022 225th Waterperry 447 85 1ms 4 Jun 2022 225th 0dyse 447 85 2ms 23 Jan 2023 225th cmayer777 447 85 2ms 26 Jan 2023 225th therealnumbers 447 85 1ms 17 Nov 2023 225th hacker112 🇸🇪 447 85 1ms 24 Jun 2024 225th TeodorDyakov 🇧🇬 447 85 1ms 5 Mar 2025 225th SirObby 🇫🇮 447 85 1ms 26 Jun 2025 233rd jackkav 442 86 1ms 6 Oct 2019 233rd TheAristos 442 86 1ms 1 Nov 2019 235th agrukuki 418 91 1ms 4 Oct 2020 236th daniel-montanari 409 93 2ms 20 Dec 2022 237th Cadichon 🇫🇷 404 94 1ms 2 Mar 2022 237th Us1ngTh3Hub 404 94 1ms 2 Apr 2024 239th Xzyaihni 396 96 1ms 20 Oct 2022 240th ozefe 🇹🇷 384 99 1ms 28 Oct 2021 First Prev 161–240 of 277 Next Last