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 241st Steffan153 🇫🇮 853 99 15ms 23 hours ago 242nd m-tkach 🇺🇦 853 118 26ms 9 Jan 2025 242nd JayXon 🇺🇸 853 118 5ms 11 Jan 2025 242nd Steffan153 🇫🇮 853 118 5ms 97 mins ago 245th Steffan153 🇫🇮 852 76 137ms 26 hours ago 246th error256 852 97 11ms 9 Jan 2025 246th nwellnhof 🇩🇪 852 97 11ms 27 Jul 2025 246th JOrE20 852 97 11ms 26 days ago 249th ovs-code 🇩🇪 851 84 402ms 6 Jan 2025 250th janAkali 🇷🇺 850 20 1,022ms 5 May 2025 250th snoozingnewt 🇨🇦 850 20 1,021ms 4 Dec 2025 252nd MeWhenI 🇻🇦 849 39 36ms 3 Jan 2025 252nd m-tkach 🇺🇦 849 39 37ms 6 Jan 2025 252nd KatieLG 🇬🇧 849 39 33ms 7 Jan 2025 252nd BREMAUCY 🇫🇷 849 39 36ms 6 Aug 2025 256th edsrzf 🇳🇿 849 83 31ms 30 Nov 2025 257th ovs-code 🇩🇪 848 25 62ms 5 Jan 2025 258th canissimia 🇦🇶 848 83 10ms 14 days ago 259th edsrzf 🇳🇿 847 45 739ms 14 Feb 2026 259th albanian-laundromat 847 45 827ms 17 Feb 2026 259th CaedenHarper 🇨🇦 847 45 722ms 17 Feb 2026 262nd error256 847 85 129ms 9 Jan 2025 262nd edsrzf 🇳🇿 847 85 15ms 26 Dec 2025 264th Steffan153 🇫🇮 847 99 425ms 27 hours ago 265th HumanoidCPU 846 44 4ms 1 Feb 2025 265th plcc0 846 44 5ms 9 Apr 2025 267th m-tkach 🇺🇦 846 105 31ms 9 Feb 2026 268th Yewzir 🇧🇪 845 60 386ms 2 Jan 2025 268th DialFrost 🇸🇬 845 60 425ms 5 Jan 2025 268th HumanoidCPU 845 60 404ms 7 Jan 2025 268th commandz0 🇺🇸 845 60 439ms 1 Sep 2025 268th snoozingnewt 🇨🇦 845 60 360ms 15 Oct 2025 273rd edsrzf 🇳🇿 845 75 105ms 1 Dec 2025 274th Steffan153 🇫🇮 845 78 2ms 28 hours ago 275th edsrzf 🇳🇿 845 110 17ms 9 Jul 2025 276th frankgraziano 845 111 2,342ms 13 Feb 2026 277th Steffan153 🇫🇮 844 92 101ms 3 hours ago 277th JayXon 🇺🇸 844 92 115ms 3 hours ago 279th GolfingSuccess 🇬🇷 844 93 25ms 24 days ago 280th edsrzf 🇳🇿 844 121 167ms 28 Jan 2026 281st primo-ppcg 🇹🇭 843 117 42ms 27 Apr 2025 282nd JayXon 🇺🇸 842 99 1,307ms 10 Jan 2025 283rd Shanethegamer 🇺🇸 842 100 2ms 5 Jan 2025 283rd Waffle3z 842 100 2ms 7 Jan 2025 285th Steffan153 🇫🇮 841 100 10ms 2 hours ago 286th ovs-code 🇩🇪 840 60 1,370ms 5 Jan 2025 287th edsrzf 🇳🇿 840 130 307ms 25 Aug 2025 287th GolfingSuccess 🇬🇷 840 130 288ms 31 Jan 2026 289th Shanethegamer 🇺🇸 838 36 3ms 4 Jan 2025 290th snyderek 🇺🇸 838 100 61ms 7 Jan 2025 291st JayXon 🇺🇸 838 147 1,675ms 15 Sep 2025 292nd DialFrost 🇸🇬 835 43 100ms 7 Jan 2025 292nd SirBogman 🇺🇸 835 43 98ms 10 Jan 2025 292nd nwellnhof 🇩🇪 835 43 97ms 14 Jan 2025 292nd GrayJoKing 🇦🇺 835 43 106ms 17 Nov 2025 292nd edsrzf 🇳🇿 835 43 105ms 10 Jan 2026 292nd denkyuu1 835 43 89ms 23 Feb 2026 298th MeWhenI 🇻🇦 835 77 58ms 6 Jan 2025 299th vlpx 🇫🇮 835 99 11ms 6 Jan 2025 300th sean-niemann 🇺🇸 835 127 42ms 4 Jan 2025 301st ovs-code 🇩🇪 834 79 4ms 5 Jan 2025 302nd GrayJoKing 🇦🇺 834 101 2ms 14 Jul 2025 303rd m-tkach 🇺🇦 834 130 12ms 7 Jan 2025 304th MeWhenI 🇻🇦 833 41 19ms 5 Jan 2025 305th DialFrost 🇸🇬 833 55 74ms 1 Jan 2025 305th snoozingnewt 🇨🇦 833 55 74ms 11 Sep 2025 307th ovs-code 🇩🇪 833 68 11ms 5 Jan 2025 307th Bulmenisaurus 833 68 11ms 5 Jan 2025 307th zacjl 833 68 12ms 5 Jan 2025 307th HPWiz 🇳🇿 833 68 12ms 5 Jan 2025 307th AlephSquirrel 833 68 10ms 5 Jan 2025 307th fourth-bit 833 68 10ms 6 Jan 2025 307th lynn 833 68 10ms 6 Jan 2025 307th xnor-gate 833 68 12ms 8 Jan 2025 307th Powerroff 833 68 11ms 9 Jan 2025 307th esmaycat 833 68 12ms 13 Jan 2025 307th lambda-abstraction 833 68 10ms 15 Jan 2025 307th firegene 🇮🇪 833 68 10ms 15 Jan 2025 307th FieryIceStickie 833 68 11ms 17 Jan 2025 307th CLOStrophobic 🇮🇹 833 68 10ms 20 Jan 2025 First Prev 241–320 of 1,061 Next Last