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?
Tutorial in all languages in bytes. 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 Bytes Time Submitted 797th 6512345 0 62 161ms 4 Nov 2025 802nd kg583 🇺🇸 0 63 49ms 21 Nov 2024 802nd emgordon154 0 63 166ms 28 Nov 2024 802nd rucin93 🇵🇱 0 63 182ms 3 Dec 2024 802nd lukegustafson 🇺🇸 0 63 181ms 7 Dec 2024 802nd sean-niemann 🇺🇸 0 63 162ms 10 Dec 2024 802nd MeWhenI 🇻🇦 0 63 6ms 18 Dec 2024 802nd zacjl 0 63 52ms 31 Dec 2024 802nd Shanethegamer 🇺🇸 0 63 182ms 10 Jan 2025 802nd CLOStrophobic 🇮🇹 0 63 58ms 17 Jan 2025 802nd edsrzf 🇳🇿 0 63 50ms 9 Feb 2025 802nd GolfingSuccess 🇬🇷 0 63 49ms 9 Feb 2025 802nd Nemikolh 🇫🇷 0 63 16ms 12 Feb 2025 802nd GolfingSuccess 🇬🇷 0 63 189ms 20 Feb 2025 802nd varhammer 0 63 6ms 22 Feb 2025 802nd voytxt 🇨🇿 0 63 189ms 17 Apr 2025 802nd FlyingPenguin223 0 63 51ms 17 Apr 2025 802nd DialFrost 🇸🇬 0 63 185ms 17 Apr 2025 802nd DialFrost 🇸🇬 0 63 5ms 17 Apr 2025 802nd DialFrost 🇸🇬 0 63 49ms 17 Apr 2025 802nd pardouin 🇫🇷 0 63 176ms 17 Apr 2025 802nd Shanethegamer 🇺🇸 0 63 5ms 17 Apr 2025 802nd Shanethegamer 🇺🇸 0 63 54ms 17 Apr 2025 802nd GolfingSuccess 🇬🇷 0 63 6ms 17 Apr 2025 802nd HumanoidCPU 0 63 177ms 18 Apr 2025 802nd HumanoidCPU 0 63 7ms 18 Apr 2025 802nd HumanoidCPU 0 63 50ms 18 Apr 2025 802nd CaedenHarper 🇨🇦 0 63 163ms 18 Apr 2025 802nd CaedenHarper 🇨🇦 0 63 6ms 18 Apr 2025 802nd CaedenHarper 🇨🇦 0 63 56ms 18 Apr 2025 802nd dokutan 0 63 158ms 28 Apr 2025 802nd dokutan 0 63 6ms 28 Apr 2025 802nd Jigglypuffed 0 63 50ms 19 Jul 2025 802nd penous 0 63 16ms 2 Aug 2025 802nd YellowDudeIsMe 0 63 14ms 14 Aug 2025 802nd albanian-laundromat 0 63 6ms 22 Aug 2025 802nd snoozingnewt 🇨🇦 0 63 183ms 15 Sep 2025 802nd snoozingnewt 🇨🇦 0 63 6ms 15 Sep 2025 802nd snoozingnewt 🇨🇦 0 63 52ms 15 Sep 2025 802nd luuumine 🇫🇷 0 63 2ms 10 Nov 2025 802nd JOrE20 0 63 6ms 18 Nov 2025 802nd kayaulai 0 63 93ms 23 Nov 2025 843rd Shanethegamer 🇺🇸 0 64 142ms 20 Nov 2024 843rd error256 0 64 131ms 21 Nov 2024 843rd error256 0 64 1,021ms 21 Nov 2024 843rd emgordon154 0 64 2ms 26 Nov 2024 843rd Liniarc 0 64 14ms 26 Nov 2024 843rd MeWhenI 🇻🇦 0 64 49ms 12 Dec 2024 843rd luuumine 🇫🇷 0 64 1,021ms 16 Oct 2025 843rd GolfingSuccess 🇬🇷 0 64 3ms 12 Nov 2025 843rd GolfingSuccess 🇬🇷 0 64 155ms 2 Dec 2025 843rd Shanethegamer 🇺🇸 0 64 152ms 4 Dec 2025 843rd GolfingSuccess 🇬🇷 0 64 110ms 15 Dec 2025 843rd amazingalek 🇳🇴 0 64 11ms 16 Dec 2025 843rd error256 0 64 150ms 3 Feb 2026 843rd pardouin 🇫🇷 0 64 167ms 4 Feb 2026 857th Shanethegamer 🇺🇸 0 65 8ms 20 Nov 2024 857th stefangimmillaro 0 65 10ms 20 Nov 2024 857th kg583 🇺🇸 0 65 10ms 21 Nov 2024 857th khvdm 0 65 12ms 21 Nov 2024 857th edsrzf 🇳🇿 0 65 10ms 21 Nov 2024 857th hallvabo 🇳🇴 0 65 11ms 24 Nov 2024 857th ovs-code 🇩🇪 0 65 12ms 25 Nov 2024 857th GolfingSuccess 🇬🇷 0 65 12ms 25 Nov 2024 857th AlephSquirrel 0 65 10ms 25 Nov 2024 857th AlephSquirrel 0 65 50ms 25 Nov 2024 857th pardouin 🇫🇷 0 65 11ms 25 Nov 2024 857th btnlq 0 65 10ms 26 Nov 2024 857th CaedenHarper 🇨🇦 0 65 12ms 26 Nov 2024 857th emgordon154 0 65 10ms 26 Nov 2024 857th inventshah 0 65 11ms 26 Nov 2024 857th sean-niemann 🇺🇸 0 65 167ms 26 Nov 2024 857th stefangimmillaro 0 65 158ms 26 Nov 2024 857th duckyluuk 🇳🇱 0 65 10ms 26 Nov 2024 857th m-tkach 🇺🇦 0 65 11ms 26 Nov 2024 857th ovs-code 🇩🇪 0 65 2ms 26 Nov 2024 857th Alex-x90 🇺🇸 0 65 10ms 28 Nov 2024 857th lifthrasiir 🇰🇷 0 65 10ms 30 Nov 2024 857th zacjl 0 65 11ms 1 Dec 2024 857th zacjl 0 65 7ms 1 Dec 2024 First Prev 801–880 of 3,452 Next Last