The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 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 624th frankgraziano 0 56 2ms 19 May 2025 624th Shanethegamer 🇺🇸 0 56 3ms 6 Jun 2025 624th Shanethegamer 🇺🇸 0 56 2,011ms 4 Jul 2025 624th edsrzf 🇳🇿 0 56 7ms 19 Jul 2025 624th AbrahamJLR 🇻🇪 0 56 7ms 20 Jul 2025 624th albanian-laundromat 0 56 534ms 4 Aug 2025 624th snoozingnewt 🇨🇦 0 56 2ms 15 Sep 2025 624th snoozingnewt 🇨🇦 0 56 7ms 15 Sep 2025 624th CaedenHarper 🇨🇦 0 56 2ms 1 Oct 2025 624th GolfingSuccess 🇬🇷 0 56 2ms 12 Nov 2025 624th edsrzf 🇳🇿 0 56 3ms 12 Nov 2025 624th JOrE20 0 56 7ms 26 Nov 2025 624th HumanoidCPU 0 56 7ms 1 Jan 2026 654th edsrzf 🇳🇿 0 57 9ms 8 Feb 2025 654th emgordon154 0 57 4ms 14 Mar 2025 654th Yewzir 🇧🇪 0 57 2ms 16 Mar 2025 654th Natanaelel 🇸🇪 0 57 2ms 20 Dec 2025 654th error256 0 57 82ms 1 Feb 2026 659th kg583 🇺🇸 0 58 6ms 21 Nov 2024 659th khvdm 0 58 11ms 21 Nov 2024 659th ovs-code 🇩🇪 0 58 6ms 25 Nov 2024 659th GolfingSuccess 🇬🇷 0 58 6ms 25 Nov 2024 659th GolfingSuccess 🇬🇷 0 58 3ms 25 Nov 2024 659th AlephSquirrel 0 58 6ms 25 Nov 2024 659th kg583 🇺🇸 0 58 12ms 26 Nov 2024 659th emgordon154 0 58 3ms 26 Nov 2024 659th m-tkach 🇺🇦 0 58 3ms 26 Nov 2024 659th emgordon154 0 58 6ms 27 Nov 2024 659th hallvabo 🇳🇴 0 58 11ms 29 Nov 2024 659th lifthrasiir 🇰🇷 0 58 13ms 30 Nov 2024 659th Shanethegamer 🇺🇸 0 58 3ms 10 Dec 2024 659th MeWhenI 🇻🇦 0 58 3ms 11 Dec 2024 659th Shanethegamer 🇺🇸 0 58 6ms 17 Dec 2024 659th zacjl 0 58 6ms 31 Dec 2024 659th m-tkach 🇺🇦 0 58 11ms 3 Jan 2025 659th CaedenHarper 🇨🇦 0 58 3ms 4 Jan 2025 659th b-illy 🇬🇧 0 58 11ms 4 Jan 2025 659th HumanoidCPU 0 58 13ms 5 Jan 2025 659th JunkIce 0 58 13ms 7 Jan 2025 659th CLOStrophobic 🇮🇹 0 58 6ms 17 Jan 2025 659th sean-niemann 🇺🇸 0 58 11ms 23 Jan 2025 659th voytxt 🇨🇿 0 58 3ms 25 Jan 2025 659th aliberro39109 0 58 11ms 25 Jan 2025 659th sisyphus-ppcg 🇦🇺 0 58 3ms 28 Jan 2025 659th UnderKoen 🇳🇱 0 58 4ms 28 Jan 2025 659th CLOStrophobic 🇮🇹 0 58 12ms 3 Feb 2025 659th dokutan 0 58 570ms 3 Feb 2025 659th HumanoidCPU 0 58 3ms 4 Feb 2025 659th emgordon154 0 58 8ms 5 Feb 2025 659th qpwoeirut 0 58 11ms 7 Feb 2025 659th edsrzf 🇳🇿 0 58 5ms 9 Feb 2025 659th targrik 0 58 3ms 15 Feb 2025 659th edsrzf 🇳🇿 0 58 3ms 19 Feb 2025 659th plcc0 0 58 11ms 20 Mar 2025 659th orthoplex 🇨🇽 0 58 4ms 16 Apr 2025 659th Mukundan314 0 58 12ms 17 Apr 2025 659th MeWhenI 🇻🇦 0 58 11ms 17 Apr 2025 659th edsrzf 🇳🇿 0 58 4ms 17 Apr 2025 659th DialFrost 🇸🇬 0 58 6ms 17 Apr 2025 659th DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 659th Shanethegamer 🇺🇸 0 58 4ms 17 Apr 2025 659th DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 659th GolfingSuccess 🇬🇷 0 58 4ms 17 Apr 2025 659th emgordon154 0 58 12ms 18 Apr 2025 659th HumanoidCPU 0 58 6ms 18 Apr 2025 659th HumanoidCPU 0 58 4ms 18 Apr 2025 659th CaedenHarper 🇨🇦 0 58 6ms 18 Apr 2025 659th CaedenHarper 🇨🇦 0 58 4ms 18 Apr 2025 659th FEZfan 🇦🇺 0 58 13ms 19 Apr 2025 659th dokutan 0 58 3ms 28 Apr 2025 659th albanian-laundromat 0 58 11ms 2 May 2025 659th ryyyn 🇺🇸 0 58 12ms 21 May 2025 659th ffelixm 0 58 11ms 30 May 2025 659th rucin93 🇵🇱 0 58 12ms 31 May 2025 659th SoliGhost 0 58 11ms 8 Jun 2025 659th alemelis 0 58 13ms 20 Jun 2025 659th 2bular 0 58 3ms 8 Jul 2025 659th anter69 🇭🇺 0 58 12ms 9 Jul 2025 659th AbrahamJLR 🇻🇪 0 58 11ms 18 Jul 2025 659th RaBa21 🇭🇺 0 58 10ms 19 Jul 2025 First Prev 641–720 of 3,409 Next Last