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?
ROT13 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 1st Sakisan 🇧🇪 1,000 17 15ms 6 May 2025 1st HPWiz 🇳🇿 1,000 17 15ms 6 May 2025 1st DialFrost 🇸🇬 1,000 17 15ms 2 Aug 2025 1st Mukundan314 1,000 17 15ms 26 Dec 2025 1st GolfingSuccess 🇬🇷 1,000 17 14ms 31 Jan 2026 6th GolfingSuccess 🇬🇷 964 22 57ms 20 Mar 2025 6th Steffan153 🇫🇮 964 22 55ms 25 mins ago 8th ovs-code 🇩🇪 961 22 2ms 7 Jan 2025 8th 2bular 961 22 2ms 5 Sep 2025 8th zacjl 961 22 2ms 6 Sep 2025 11th commandz0 🇺🇸 960 59 11ms 5 Jan 2025 11th JayXon 🇺🇸 960 59 11ms 5 Jan 2025 11th btnlq 960 59 12ms 5 Jan 2025 11th pardouin 🇫🇷 960 59 32ms 5 Jan 2025 11th khvdm 960 59 11ms 5 Jan 2025 11th Seek64 🇩🇪 960 59 10ms 6 Jan 2025 11th m-tkach 🇺🇦 960 59 11ms 7 Jan 2025 11th thatbirdguythatuknownot 960 59 32ms 14 Jan 2025 11th GolfingSuccess 🇬🇷 960 59 11ms 22 Jan 2025 11th Lydxn 🇨🇦 960 59 10ms 23 Jan 2025 11th ndren 960 59 10ms 6 Feb 2025 11th CornerMercury 🇬🇧 960 59 10ms 6 Feb 2025 11th hallvabo 🇳🇴 960 59 11ms 10 Apr 2025 11th fuzzylojik-golf 🇺🇸 960 59 12ms 7 Jul 2025 11th xsot 🇸🇬 960 59 11ms 9 Jul 2025 11th duckyluuk 🇳🇱 960 59 31ms 9 Jul 2025 11th lukegustafson 🇺🇸 960 59 12ms 9 Jul 2025 11th kg583 🇺🇸 960 59 12ms 9 Jul 2025 11th Alex-x90 🇺🇸 960 59 10ms 11 Jul 2025 11th Mukundan314 960 59 10ms 13 Jul 2025 11th b-illy 🇬🇧 960 59 32ms 13 Jul 2025 11th emgordon154 960 59 11ms 18 Jul 2025 11th Babafaba 960 59 30ms 30 Oct 2025 11th CaedenHarper 🇨🇦 960 59 11ms 30 Oct 2025 11th luuumine 🇫🇷 960 59 11ms 30 Oct 2025 11th KasperKivimaeki 🇫🇮 960 59 10ms 31 Oct 2025 11th sunleonid 960 59 32ms 26 Nov 2025 11th cefqrn 960 59 11ms 26 Nov 2025 11th plcc0 960 59 11ms 12 Jan 2026 11th sean-niemann 🇺🇸 960 59 11ms 15 Feb 2026 11th Steffan153 🇫🇮 960 59 11ms 15 Feb 2026 11th snoozingnewt 🇨🇦 960 59 10ms 20 Feb 2026 11th dokutan 960 59 11ms 26 days ago 44th ovs-code 🇩🇪 946 35 36ms 3 Jan 2025 44th sisyphus-ppcg 🇦🇺 946 35 38ms 6 Jan 2025 44th pardouin 🇫🇷 946 35 37ms 7 Jan 2025 44th janlelis 946 35 36ms 9 Jan 2025 44th tatzyr 🇯🇵 946 35 35ms 14 Jan 2025 44th primo-ppcg 🇹🇭 946 35 38ms 21 Jan 2025 44th Steffan153 🇫🇮 946 35 35ms 14 Feb 2026 44th GolfingSuccess 🇬🇷 946 35 37ms 15 Feb 2026 44th sean-niemann 🇺🇸 946 35 36ms 15 Feb 2026 44th JayXon 🇺🇸 946 35 38ms 15 Feb 2026 44th xsot 🇸🇬 946 35 35ms 16 Feb 2026 55th DialFrost 🇸🇬 944 60 11ms 5 Jan 2025 55th rucin93 🇵🇱 944 60 11ms 31 May 2025 55th RaBa21 🇭🇺 944 60 10ms 19 Jul 2025 55th qpwoeirut 944 60 10ms 10 Aug 2025 55th Yewzir 🇧🇪 944 60 10ms 1 Dec 2025 55th ryyyn 🇺🇸 944 60 11ms 22 Jan 2026 55th Flekay 🇩🇪 944 60 11ms 15 Feb 2026 62nd saito-ta 🇯🇵 943 32 2ms 3 Jan 2025 62nd ovs-code 🇩🇪 943 32 3ms 3 Jan 2025 62nd HPWiz 🇳🇿 943 32 3ms 5 Jan 2025 62nd sisyphus-ppcg 🇦🇺 943 32 2ms 6 Jan 2025 62nd lynn 943 32 2ms 6 Jan 2025 62nd pardouin 🇫🇷 943 32 3ms 7 Jan 2025 62nd tatzyr 🇯🇵 943 32 3ms 16 Jan 2025 62nd primo-ppcg 🇹🇭 943 32 3ms 20 Jan 2025 62nd Steffan153 🇫🇮 943 32 3ms 14 Feb 2026 62nd GolfingSuccess 🇬🇷 943 32 3ms 15 Feb 2026 62nd sean-niemann 🇺🇸 943 32 3ms 15 Feb 2026 62nd JayXon 🇺🇸 943 32 3ms 16 Feb 2026 62nd xsot 🇸🇬 943 32 3ms 16 Feb 2026 75th sean-niemann 🇺🇸 931 40 5ms 31 Dec 2024 75th stefangimmillaro 931 40 4ms 4 Jan 2025 75th sisyphus-ppcg 🇦🇺 931 40 4ms 5 Jan 2025 75th xsot 🇸🇬 931 40 5ms 10 Jan 2025 75th JayXon 🇺🇸 931 40 4ms 11 Jan 2025 75th primo-ppcg 🇹🇭 931 40 5ms 21 Jan 2025 1–80 of 1,064 Next Last