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 157th edsrzf 🇳🇿 0 71 18ms 3 hours ago 157th kg583 🇺🇸 0 71 18ms 116 mins ago 163rd edsrzf 🇳🇿 0 72 546ms 9 May 2025 163rd rucin93 🇵🇱 0 72 9ms 17 days ago 163rd aksyristos 0 72 247ms 13 days ago 163rd blaztoma 🇱🇹 0 72 123ms 15 hours ago 163rd Emutis 🇱🇹 0 72 121ms 14 hours ago 163rd KasperKivimaeki 🇫🇮 0 72 4ms 9 hours ago 169th IISResetMe 0 73 310ms 10 Jan 2026 170th rhdqor213 0 74 3ms 11 May 2025 170th saito-ta 🇯🇵 0 74 3ms 11 May 2025 170th error256 0 74 3ms 12 Jan 2026 170th dokutan 0 74 65ms 8 Feb 2026 170th lukegustafson 🇺🇸 0 74 189ms 15 days ago 170th albanian-laundromat 0 74 9ms 7 days ago 176th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 176th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 176th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 176th albanian-laundromat 0 75 108ms 5 Jan 2026 176th albanian-laundromat 0 75 455ms 6 Jan 2026 176th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 176th albanian-laundromat 0 75 238ms 22 days ago 176th madex 🇩🇪 0 75 18ms 6 days ago 176th CaedenHarper 🇨🇦 0 75 149ms 3 days ago 176th Yax42 🇫🇷 0 75 4ms 10 hours ago 186th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 186th edsrzf 🇳🇿 0 76 114ms 10 May 2025 186th ovs-code 🇩🇪 0 76 3ms 10 May 2025 186th AlephSquirrel 0 76 43ms 3 Dec 2025 186th AlephSquirrel 0 76 445ms 3 Dec 2025 186th albanian-laundromat 0 76 18ms 22 days ago 186th albanian-laundromat 0 76 188ms 16 days ago 186th MeWhenI 🇻🇦 0 76 586ms 9 days ago 194th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 194th DialFrost 🇸🇬 0 77 19ms 8 May 2025 194th edsrzf 🇳🇿 0 77 1,938ms 9 May 2025 194th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 194th addmai 0 77 20ms 24 Jul 2025 194th hiichbindermax 0 77 19ms 17 Aug 2025 194th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 194th davecame 0 77 150ms 25 Sep 2025 194th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 194th jtaxen 0 77 19ms 16 Oct 2025 194th albanian-laundromat 0 77 412ms 6 Dec 2025 194th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 194th KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 194th StefanHabel 🇨🇦 0 77 1,207ms 23 hours ago 194th ahmetdemirag 🇨🇾 0 77 18ms 18 hours ago 194th tomh1012 0 77 17ms 16 hours ago 194th qpwoeirut 0 77 20ms 84 mins ago 211th jameswmccarty 0 78 20ms 29 Mar 2025 211th DialFrost 🇸🇬 0 78 940ms 10 May 2025 211th DialFrost 🇸🇬 0 78 3ms 10 May 2025 211th solisolu 0 78 20ms 10 Nov 2025 215th BREMAUCY 🇫🇷 0 79 18ms 19 hours ago 215th Andrey2001 0 79 18ms 13 hours ago 217th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 217th error256 0 80 466ms 16 Jan 2026 217th madex 🇩🇪 0 80 378ms 22 hours ago 217th stefangimmillaro 0 80 19ms 37 mins ago 221st Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 222nd bricknellj 0 82 17ms 30 Jan 2025 222nd scpchicken 🇵🇼 0 82 402ms 30 hours ago 222nd KatieLG 🇬🇧 0 82 18ms 30 hours ago 222nd madex 🇩🇪 0 82 4ms 22 hours ago 226th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 226th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 226th error256 0 83 430ms 12 Jan 2026 226th albanian-laundromat 0 83 9ms 26 Jan 2026 230th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 230th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 230th albanian-laundromat 0 85 92ms 6 Dec 2025 230th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 234th kg583 🇺🇸 0 86 23ms 2 Oct 2025 234th GolfingSuccess 🇬🇷 0 86 2,109ms 15 days ago 236th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 236th error256 0 87 2,931ms 14 Jan 2026 236th IanUtley 0 87 2,957ms 16 Jan 2026 236th CaedenHarper 🇨🇦 0 87 439ms 5 hours ago 240th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 First Prev 161–240 of 310 Next Last