The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 77th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 82nd edsrzf 🇳🇿 0 57 13ms 10 May 2025 82nd pardouin 🇫🇷 0 57 572ms 14 Feb 2026 82nd GolfingSuccess 🇬🇷 0 57 213ms 15 days ago 82nd rucin93 🇵🇱 0 57 211ms 15 days ago 86th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 87th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 87th ovs-code 🇩🇪 0 59 502ms 23 Feb 2025 87th error256 0 59 68ms 13 Jan 2026 87th madex 🇩🇪 0 59 2,743ms 3 days ago 91st khvdm 0 60 156ms 13 Jan 2025 91st emgordon154 0 60 379ms 9 May 2025 91st albanian-laundromat 0 60 369ms 22 Feb 2026 91st sean-niemann 🇺🇸 0 60 458ms 2 days ago 95th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 95th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 95th albanian-laundromat 0 61 26ms 20 days ago 95th aksyristos 0 61 11ms 6 days ago 99th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 99th XenThe 🇬🇧 0 62 11ms 15 Jul 2025 99th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 99th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 99th JOrE20 0 62 28ms 24 days ago 104th kg583 🇺🇸 0 63 904ms 1 Dec 2024 104th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 104th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 104th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 104th rucin93 🇵🇱 0 63 7ms 10 May 2025 104th edsrzf 🇳🇿 0 63 6ms 10 May 2025 104th targrik 0 63 7ms 8 Oct 2025 104th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 104th fuzzylojik-golf 🇺🇸 0 63 142ms 14 hours ago 113th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 113th ndren 0 64 18ms 3 Dec 2024 113th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 113th emgordon154 0 64 19ms 9 May 2025 113th error256 0 64 4,375ms 15 Jan 2026 113th anter69 🇭🇺 0 64 19ms 4 Feb 2026 113th albanian-laundromat 0 64 18ms 22 Feb 2026 113th albanian-laundromat 0 64 547ms 23 Feb 2026 121st Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 121st GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 121st dokutan 0 65 359ms 14 Feb 2026 124th dokutan 0 66 19ms 18 Aug 2025 124th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 124th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 124th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 128th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 128th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 128th namelessiw 0 67 407ms 2 Nov 2025 128th error256 0 67 111ms 30 Jan 2026 128th CaedenHarper 🇨🇦 0 67 770ms 2 days ago 128th fuzzylojik-golf 🇺🇸 0 67 490ms 14 hours ago 134th 4atj 0 69 1,159ms 21 May 2025 134th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 134th error256 0 69 410ms 42 hours ago 137th btnlq 0 70 193ms 4 Dec 2024 137th kg583 🇺🇸 0 70 128ms 3 Oct 2025 137th error256 0 70 133ms 15 Jan 2026 137th error256 0 70 18ms 11 days ago 141st GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 141st GolfingSuccess 🇬🇷 0 71 25ms 12 Jan 2026 141st GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 144th edsrzf 🇳🇿 0 72 546ms 9 May 2025 144th kg583 🇺🇸 0 72 18ms 2 Oct 2025 144th rucin93 🇵🇱 0 72 9ms 17 days ago 144th aksyristos 0 72 247ms 12 days ago 144th blaztoma 🇱🇹 0 72 122ms 42 mins ago 149th IISResetMe 0 73 429ms 10 Jan 2026 149th Seek64 🇩🇪 0 73 111ms 5 hours ago 151st rhdqor213 0 74 3ms 11 May 2025 151st saito-ta 🇯🇵 0 74 3ms 11 May 2025 151st error256 0 74 3ms 12 Jan 2026 151st dokutan 0 74 65ms 8 Feb 2026 151st lukegustafson 🇺🇸 0 74 190ms 15 days ago 151st albanian-laundromat 0 74 9ms 7 days ago 157th ovs-code 🇩🇪 0 75 19ms 23 Feb 2025 157th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 157th edsrzf 🇳🇿 0 75 669ms 9 May 2025 157th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 First Prev 81–160 of 285 Next Last