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?
Gray Code Decoder 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 80th pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 80th edsrzf 🇳🇿 0 53 2,777ms 8 hours ago 83rd Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 83rd error256 0 54 28ms 2 May 2025 83rd albanian-laundromat 0 54 2,676ms 18 Feb 2026 83rd emgordon154 0 54 33ms 33 hours ago 83rd MeWhenI 🇻🇦 0 54 50ms 11 hours ago 83rd ComradeSquirrel 0 54 41ms 5 hours ago 89th error256 0 55 2,813ms 15 Feb 2026 90th kg583 🇺🇸 0 56 562ms 1 Dec 2024 90th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 90th kg583 🇺🇸 0 56 9ms 14 Jan 2026 90th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 90th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 90th edsrzf 🇳🇿 0 56 9ms 19 hours ago 90th helbling 🇨🇭 0 56 40ms 18 hours ago 90th CaedenHarper 🇨🇦 0 56 14ms 15 hours ago 98th edsrzf 🇳🇿 0 57 14ms 10 May 2025 98th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 98th GolfingSuccess 🇬🇷 0 57 213ms 16 days ago 98th rucin93 🇵🇱 0 57 211ms 16 days ago 102nd sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 103rd lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 103rd ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 103rd error256 0 59 68ms 13 Jan 2026 103rd madex 🇩🇪 0 59 2,743ms 4 days ago 107th khvdm 0 60 144ms 13 Jan 2025 107th emgordon154 0 60 379ms 9 May 2025 107th albanian-laundromat 0 60 369ms 22 Feb 2026 107th sean-niemann 🇺🇸 0 60 458ms 3 days ago 107th Seek64 🇩🇪 0 60 125ms 23 hours ago 107th HumanoidCPU 0 60 562ms 15 hours ago 113th DialFrost 🇸🇬 0 61 34ms 24 Feb 2025 113th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 113th albanian-laundromat 0 61 26ms 21 days ago 113th aksyristos 0 61 11ms 7 days ago 117th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 117th XenThe 🇬🇧 0 62 16ms 15 Jul 2025 117th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 117th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 117th JOrE20 0 62 28ms 25 days ago 117th edsrzf 🇳🇿 0 62 111ms 6 hours ago 123rd kg583 🇺🇸 0 63 904ms 1 Dec 2024 123rd hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 123rd Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 123rd sean-niemann 🇺🇸 0 63 7ms 9 May 2025 123rd rucin93 🇵🇱 0 63 7ms 10 May 2025 123rd edsrzf 🇳🇿 0 63 6ms 10 May 2025 123rd targrik 0 63 7ms 8 Oct 2025 123rd GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 123rd fuzzylojik-golf 🇺🇸 0 63 142ms 38 hours ago 123rd plcc0 0 63 20ms a min ago 133rd CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 133rd ndren 0 64 18ms 3 Dec 2024 133rd lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 133rd emgordon154 0 64 19ms 9 May 2025 133rd error256 0 64 4,375ms 15 Jan 2026 133rd anter69 🇭🇺 0 64 19ms 4 Feb 2026 133rd albanian-laundromat 0 64 18ms 22 Feb 2026 133rd albanian-laundromat 0 64 547ms 23 Feb 2026 133rd HumanoidCPU 0 64 256ms 15 hours ago 142nd Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 142nd GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 142nd dokutan 0 65 359ms 14 Feb 2026 145th dokutan 0 66 19ms 18 Aug 2025 145th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 145th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 145th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 145th edsrzf 🇳🇿 0 66 11ms 8 hours ago 150th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 150th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 150th namelessiw 0 67 407ms 2 Nov 2025 150th error256 0 67 111ms 30 Jan 2026 150th CaedenHarper 🇨🇦 0 67 553ms 3 days ago 150th fuzzylojik-golf 🇺🇸 0 67 490ms 38 hours ago 156th Yax42 🇫🇷 0 68 12ms 22 hours ago 157th 4atj 0 69 1,159ms 21 May 2025 157th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 157th error256 0 69 410ms 2 days ago 157th edsrzf 🇳🇿 0 69 394ms 7 hours ago First Prev 81–160 of 326 Next Last