The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 161st lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 161st emgordon154 0 64 19ms 9 May 2025 161st error256 0 64 4,375ms 15 Jan 2026 161st anter69 🇭🇺 0 64 19ms 4 Feb 2026 161st albanian-laundromat 0 64 18ms 22 Feb 2026 161st albanian-laundromat 0 64 547ms 23 Feb 2026 161st HumanoidCPU 0 64 256ms 2 days ago 168th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 168th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 168th dokutan 0 65 359ms 14 Feb 2026 171st dokutan 0 66 19ms 18 Aug 2025 171st Yax42 🇫🇷 0 66 470ms 6 Jan 2026 171st AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 171st GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 171st edsrzf 🇳🇿 0 66 11ms 2 days ago 171st Steffan153 🇫🇮 0 66 10ms 37 hours ago 177th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 177th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 177th namelessiw 0 67 407ms 2 Nov 2025 177th error256 0 67 111ms 30 Jan 2026 177th CaedenHarper 🇨🇦 0 67 553ms 5 days ago 177th fuzzylojik-golf 🇺🇸 0 67 490ms 3 days ago 177th madex 🇩🇪 0 67 9ms 11 hours ago 184th Yax42 🇫🇷 0 68 16ms 3 days ago 185th 4atj 0 69 1,159ms 21 May 2025 185th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 185th error256 0 69 410ms 4 days ago 185th edsrzf 🇳🇿 0 69 394ms 2 days ago 189th btnlq 0 70 193ms 4 Dec 2024 189th error256 0 70 133ms 15 Jan 2026 189th error256 0 70 18ms 14 days ago 189th DialFrost 🇸🇬 0 70 116ms 27 hours ago 193rd GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 193rd GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 193rd GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 193rd ovs-code 🇩🇪 0 71 134ms 3 days ago 193rd edsrzf 🇳🇿 0 71 18ms 2 days ago 193rd kg583 🇺🇸 0 71 18ms 2 days ago 193rd rhdqor213 0 71 4ms 2 days ago 193rd ovs-code 🇩🇪 0 71 129ms 26 hours ago 201st rucin93 🇵🇱 0 72 9ms 20 days ago 201st aksyristos 0 72 247ms 15 days ago 201st blaztoma 🇱🇹 0 72 123ms 3 days ago 201st Emutis 🇱🇹 0 72 121ms 3 days ago 201st KasperKivimaeki 🇫🇮 0 72 4ms 2 days ago 201st edsrzf 🇳🇿 0 72 9ms 2 days ago 201st zacjl 0 72 131ms 39 hours ago 201st Steffan153 🇫🇮 0 72 3ms 28 hours ago 209th saito-ta 🇯🇵 0 74 3ms 11 May 2025 209th error256 0 74 3ms 12 Jan 2026 209th dokutan 0 74 65ms 8 Feb 2026 209th lukegustafson 🇺🇸 0 74 189ms 18 days ago 209th albanian-laundromat 0 74 9ms 10 days ago 214th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 214th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 214th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 214th albanian-laundromat 0 75 108ms 5 Jan 2026 214th albanian-laundromat 0 75 455ms 6 Jan 2026 214th GolfingSuccess 🇬🇷 0 75 19ms 11 Jan 2026 214th albanian-laundromat 0 75 238ms 24 days ago 214th madex 🇩🇪 0 75 34ms 8 days ago 214th CaedenHarper 🇨🇦 0 75 149ms 5 days ago 214th Yax42 🇫🇷 0 75 4ms 3 days ago 214th edsrzf 🇳🇿 0 75 17ms 2 days ago 214th zgialor-lab 0 75 25ms 2 days ago 214th madex 🇩🇪 0 75 439ms 11 hours ago 227th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 227th ovs-code 🇩🇪 0 76 3ms 10 May 2025 227th AlephSquirrel 0 76 43ms 3 Dec 2025 227th AlephSquirrel 0 76 445ms 3 Dec 2025 227th albanian-laundromat 0 76 18ms 24 days ago 227th albanian-laundromat 0 76 188ms 18 days ago 227th MeWhenI 🇻🇦 0 76 586ms 11 days ago 227th MeWhenI 🇻🇦 0 76 184ms 44 hours ago 227th duckyluuk 🇳🇱 0 76 128ms 27 hours ago 236th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 236th DialFrost 🇸🇬 0 77 18ms 8 May 2025 236th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 236th addmai 0 77 20ms 24 Jul 2025 236th hiichbindermax 0 77 19ms 17 Aug 2025 First Prev 161–240 of 381 Next Last