The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 160th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 160th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 160th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 160th edsrzf 🇳🇿 0 66 11ms 36 hours ago 160th Steffan153 🇫🇮 0 66 10ms 12 hours ago 166th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 166th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 166th namelessiw 0 67 407ms 2 Nov 2025 166th error256 0 67 111ms 30 Jan 2026 166th CaedenHarper 🇨🇦 0 67 553ms 4 days ago 166th fuzzylojik-golf 🇺🇸 0 67 490ms 2 days ago 172nd Yax42 🇫🇷 0 68 16ms 2 days ago 173rd 4atj 0 69 1,159ms 21 May 2025 173rd GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 173rd error256 0 69 410ms 3 days ago 173rd edsrzf 🇳🇿 0 69 394ms 35 hours ago 177th btnlq 0 70 193ms 4 Dec 2024 177th error256 0 70 133ms 15 Jan 2026 177th error256 0 70 18ms 13 days ago 177th DialFrost 🇸🇬 0 70 116ms 2 hours ago 181st GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 181st GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 181st GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 181st ovs-code 🇩🇪 0 71 134ms 2 days ago 181st edsrzf 🇳🇿 0 71 18ms 41 hours ago 181st kg583 🇺🇸 0 71 18ms 39 hours ago 181st rhdqor213 0 71 4ms 34 hours ago 181st ovs-code 🇩🇪 0 71 129ms 2 hours ago 189th rucin93 🇵🇱 0 72 9ms 19 days ago 189th aksyristos 0 72 247ms 14 days ago 189th blaztoma 🇱🇹 0 72 123ms 2 days ago 189th Emutis 🇱🇹 0 72 121ms 2 days ago 189th KasperKivimaeki 🇫🇮 0 72 4ms 47 hours ago 189th edsrzf 🇳🇿 0 72 9ms 33 hours ago 189th zacjl 0 72 131ms 14 hours ago 189th Steffan153 🇫🇮 0 72 4ms 3 hours ago 197th IISResetMe 0 73 310ms 10 Jan 2026 198th saito-ta 🇯🇵 0 74 3ms 11 May 2025 198th error256 0 74 3ms 12 Jan 2026 198th dokutan 0 74 65ms 8 Feb 2026 198th lukegustafson 🇺🇸 0 74 189ms 17 days ago 198th albanian-laundromat 0 74 9ms 9 days ago 203rd Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 203rd Natanaelel 🇸🇪 0 75 19ms 11 May 2025 203rd commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 203rd albanian-laundromat 0 75 108ms 5 Jan 2026 203rd albanian-laundromat 0 75 455ms 6 Jan 2026 203rd GolfingSuccess 🇬🇷 0 75 19ms 11 Jan 2026 203rd albanian-laundromat 0 75 238ms 23 days ago 203rd madex 🇩🇪 0 75 18ms 7 days ago 203rd CaedenHarper 🇨🇦 0 75 149ms 4 days ago 203rd Yax42 🇫🇷 0 75 4ms 2 days ago 203rd edsrzf 🇳🇿 0 75 17ms 33 hours ago 203rd zgialor-lab 0 75 25ms 25 hours ago 215th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 215th ovs-code 🇩🇪 0 76 3ms 10 May 2025 215th AlephSquirrel 0 76 43ms 3 Dec 2025 215th AlephSquirrel 0 76 445ms 3 Dec 2025 215th albanian-laundromat 0 76 18ms 23 days ago 215th albanian-laundromat 0 76 188ms 17 days ago 215th MeWhenI 🇻🇦 0 76 586ms 10 days ago 215th MeWhenI 🇻🇦 0 76 184ms 19 hours ago 215th duckyluuk 🇳🇱 0 76 128ms 3 hours ago 224th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 224th DialFrost 🇸🇬 0 77 18ms 8 May 2025 224th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 224th addmai 0 77 20ms 24 Jul 2025 224th hiichbindermax 0 77 19ms 17 Aug 2025 224th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 224th davecame 0 77 135ms 25 Sep 2025 224th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 224th jtaxen 0 77 19ms 16 Oct 2025 224th albanian-laundromat 0 77 412ms 6 Dec 2025 224th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 224th KasperKivimaeki 🇫🇮 0 77 564ms 10 days ago 224th StefanHabel 🇨🇦 0 77 1,217ms 2 days ago 224th ahmetdemirag 🇨🇾 0 77 18ms 2 days ago 224th tomh1012 0 77 17ms 2 days ago 224th qpwoeirut 0 77 20ms 39 hours ago 224th btjones0 0 77 19ms 36 hours ago First Prev 161–240 of 361 Next Last