The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 hours. Why not try and solve them ahead of time?
Tutorial 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 626th sean-niemann 🇺🇸 0 56 7ms 9 May 2025 626th DialFrost 🇸🇬 0 56 6ms 9 May 2025 626th frankgraziano 0 56 2ms 19 May 2025 626th Shanethegamer 🇺🇸 0 56 3ms 6 Jun 2025 626th Shanethegamer 🇺🇸 0 56 2,011ms 4 Jul 2025 626th edsrzf 🇳🇿 0 56 7ms 19 Jul 2025 626th AbrahamJLR 🇻🇪 0 56 7ms 20 Jul 2025 626th albanian-laundromat 0 56 534ms 4 Aug 2025 626th snoozingnewt 🇨🇦 0 56 2ms 15 Sep 2025 626th snoozingnewt 🇨🇦 0 56 7ms 15 Sep 2025 626th CaedenHarper 🇨🇦 0 56 2ms 1 Oct 2025 626th GolfingSuccess 🇬🇷 0 56 2ms 12 Nov 2025 626th edsrzf 🇳🇿 0 56 3ms 12 Nov 2025 626th JOrE20 0 56 7ms 26 Nov 2025 626th HumanoidCPU 0 56 7ms 1 Jan 2026 656th edsrzf 🇳🇿 0 57 9ms 8 Feb 2025 656th emgordon154 0 57 4ms 14 Mar 2025 656th Yewzir 🇧🇪 0 57 2ms 16 Mar 2025 656th Natanaelel 🇸🇪 0 57 2ms 20 Dec 2025 656th error256 0 57 82ms 1 Feb 2026 661st kg583 🇺🇸 0 58 6ms 21 Nov 2024 661st khvdm 0 58 11ms 21 Nov 2024 661st ovs-code 🇩🇪 0 58 6ms 25 Nov 2024 661st GolfingSuccess 🇬🇷 0 58 6ms 25 Nov 2024 661st GolfingSuccess 🇬🇷 0 58 3ms 25 Nov 2024 661st AlephSquirrel 0 58 6ms 25 Nov 2024 661st kg583 🇺🇸 0 58 12ms 26 Nov 2024 661st emgordon154 0 58 3ms 26 Nov 2024 661st m-tkach 🇺🇦 0 58 3ms 26 Nov 2024 661st emgordon154 0 58 6ms 27 Nov 2024 661st hallvabo 🇳🇴 0 58 11ms 29 Nov 2024 661st lifthrasiir 🇰🇷 0 58 13ms 30 Nov 2024 661st Shanethegamer 🇺🇸 0 58 3ms 10 Dec 2024 661st MeWhenI 🇻🇦 0 58 3ms 11 Dec 2024 661st Shanethegamer 🇺🇸 0 58 6ms 17 Dec 2024 661st zacjl 0 58 6ms 31 Dec 2024 661st m-tkach 🇺🇦 0 58 11ms 3 Jan 2025 661st CaedenHarper 🇨🇦 0 58 3ms 4 Jan 2025 661st b-illy 🇬🇧 0 58 11ms 4 Jan 2025 661st HumanoidCPU 0 58 13ms 5 Jan 2025 661st JunkIce 0 58 13ms 7 Jan 2025 661st CLOStrophobic 🇮🇹 0 58 6ms 17 Jan 2025 661st sean-niemann 🇺🇸 0 58 11ms 23 Jan 2025 661st voytxt 🇨🇿 0 58 3ms 25 Jan 2025 661st aliberro39109 0 58 11ms 25 Jan 2025 661st sisyphus-ppcg 🇦🇺 0 58 3ms 28 Jan 2025 661st UnderKoen 🇳🇱 0 58 4ms 28 Jan 2025 661st CLOStrophobic 🇮🇹 0 58 12ms 3 Feb 2025 661st dokutan 0 58 570ms 3 Feb 2025 661st HumanoidCPU 0 58 3ms 4 Feb 2025 661st emgordon154 0 58 8ms 5 Feb 2025 661st qpwoeirut 0 58 11ms 7 Feb 2025 661st edsrzf 🇳🇿 0 58 5ms 9 Feb 2025 661st targrik 0 58 3ms 15 Feb 2025 661st edsrzf 🇳🇿 0 58 3ms 19 Feb 2025 661st plcc0 0 58 11ms 20 Mar 2025 661st orthoplex 🇨🇽 0 58 4ms 16 Apr 2025 661st Mukundan314 0 58 12ms 17 Apr 2025 661st MeWhenI 🇻🇦 0 58 11ms 17 Apr 2025 661st edsrzf 🇳🇿 0 58 4ms 17 Apr 2025 661st DialFrost 🇸🇬 0 58 6ms 17 Apr 2025 661st DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 661st Shanethegamer 🇺🇸 0 58 4ms 17 Apr 2025 661st DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 661st GolfingSuccess 🇬🇷 0 58 4ms 17 Apr 2025 661st emgordon154 0 58 12ms 18 Apr 2025 661st HumanoidCPU 0 58 6ms 18 Apr 2025 661st HumanoidCPU 0 58 4ms 18 Apr 2025 661st CaedenHarper 🇨🇦 0 58 6ms 18 Apr 2025 661st CaedenHarper 🇨🇦 0 58 4ms 18 Apr 2025 661st FEZfan 🇦🇺 0 58 13ms 19 Apr 2025 661st dokutan 0 58 3ms 28 Apr 2025 661st albanian-laundromat 0 58 11ms 2 May 2025 661st ryyyn 🇺🇸 0 58 12ms 21 May 2025 661st ffelixm 0 58 11ms 30 May 2025 661st rucin93 🇵🇱 0 58 12ms 31 May 2025 661st SoliGhost 0 58 11ms 8 Jun 2025 661st alemelis 0 58 13ms 20 Jun 2025 661st 2bular 0 58 3ms 8 Jul 2025 661st anter69 🇭🇺 0 58 12ms 9 Jul 2025 First Prev 641–720 of 3,412 Next Last