The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
DFA Simulator in all languages in bytes. 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 Bytes Time Submitted 241st emgordon154 791 202 10ms 22 May 2025 242nd snyderek 🇺🇸 790 215 71ms 21 Jun 2025 243rd Shanethegamer 🇺🇸 790 408 1,515ms 24 Apr 2025 244th lifthrasiir 🇰🇷 788 160 535ms 2 Dec 2024 245th jared-hughes 787 396 57ms 18 Aug 2024 246th ndren 786 179 99ms 8 Nov 2023 246th inventshah 786 179 11ms 3 Dec 2023 246th solisolu 786 179 14ms 2 days ago 249th olleicua 🇺🇸 783 146 13ms 3 Feb 2024 249th emgordon154 783 146 9ms 24 Nov 2024 251st albanian-laundromat 783 161 549ms 4 Aug 2025 252nd cros107 🇦🇺 782 180 11ms 2 Nov 2023 252nd wyarde 782 180 12ms 2 Nov 2023 254th MeWhenI 🇻🇦 780 480 97ms 1 Aug 2024 255th anter69 🇭🇺 779 119 45ms 28 Mar 2024 256th edsrzf 🇳🇿 779 222 12ms 29 Jun 2025 257th duckyluuk 🇳🇱 778 147 10ms 6 Nov 2024 258th Shanethegamer 🇺🇸 778 193 2ms 7 Nov 2023 258th Alex-x90 🇺🇸 778 193 2ms 24 Nov 2023 260th Shanethegamer 🇺🇸 778 245 128ms 5 Apr 2025 261st albanian-laundromat 775 223 3ms 24 Jul 2025 262nd namelessiw 774 186 441ms 13 Jan 2026 263rd MeWhenI 🇻🇦 773 75 58ms 26 Jul 2025 264th Shanethegamer 🇺🇸 773 120 40ms 1 Nov 2023 265th Salutations45 773 148 10ms 16 Dec 2024 266th Shanethegamer 🇺🇸 771 213 154ms 28 Nov 2023 267th GolfingSuccess 🇬🇷 770 195 2ms 1 Nov 2023 268th MeWhenI 🇻🇦 769 192 10ms 7 Dec 2023 269th Command-Master 769 221 2,803ms 2 Nov 2023 270th snoozingnewt 🇨🇦 767 220 583ms 18 Oct 2025 271st SirBogman 🇺🇸 764 122 173ms 4 Nov 2023 272nd MeWhenI 🇻🇦 764 221 578ms 13 Jul 2024 273rd MeWhenI 🇻🇦 763 249 461ms 7 Nov 2025 274th MichalMarsalek 🇨🇿 762 150 10ms 1 Nov 2023 274th uttumuttu 🇫🇮 762 150 11ms 3 Nov 2023 276th pardouin 🇫🇷 759 179 2,741ms 19 Jul 2025 277th MeWhenI 🇻🇦 759 192 412ms 20 Jun 2024 278th Shanethegamer 🇺🇸 758 190 396ms 14 Nov 2023 279th Shanethegamer 🇺🇸 757 143 1,370ms 1 Nov 2023 280th coreynash 757 151 10ms 10 Jul 2024 281st commandz0 🇺🇸 757 186 13ms 6 Nov 2023 282nd stefangimmillaro 756 274 276ms 4 Nov 2023 283rd CatsAreFluffy 755 105 49ms 26 Nov 2023 284th Emutis 🇱🇹 753 187 13ms 12 Oct 2025 285th SirBogman 🇺🇸 752 141 546ms 2 Nov 2023 286th JOrE20 752 152 11ms 16 Feb 2026 287th Alex-x90 🇺🇸 752 226 2,903ms 2 Nov 2023 288th emgordon154 752 279 263ms 7 Mar 2025 289th sean-niemann 🇺🇸 749 206 3ms 19 Nov 2025 290th Protothor 747 153 12ms 10 Jun 2025 291st GolfingSuccess 🇬🇷 745 228 66ms 1 Nov 2023 292nd edsrzf 🇳🇿 742 212 162ms 14 days ago 293rd lifthrasiir 🇰🇷 740 86 3ms 6 Dec 2024 294th snoozingnewt 🇨🇦 738 239 112ms 20 Nov 2025 295th lelbal 737 191 11ms 12 Nov 2025 296th MeWhenI 🇻🇦 734 282 280ms 25 Nov 2023 297th adamnielson42 🇺🇸 733 192 12ms 1 Nov 2023 298th elgan65536 🇺🇸 729 193 12ms 11 Apr 2024 299th tailorspy 729 233 64ms 14 Aug 2024 300th olleicua 🇺🇸 724 128 37ms 19 Jan 2024 301st MeWhenI 🇻🇦 724 199 387ms 20 Jun 2024 301st snoozingnewt 🇨🇦 724 199 415ms 18 Oct 2025 303rd albanian-laundromat 724 267 44ms 11 Nov 2025 304th commandz0 🇺🇸 721 175 510ms 1 Sep 2025 305th billings7 🇬🇧 720 200 431ms 11 Nov 2023 305th bpharaldsson 720 200 394ms 13 Feb 2026 307th prplz 🇦🇺 719 209 2ms 2 Nov 2023 308th MeWhenI 🇻🇦 718 172 41ms 18 Aug 2024 309th bpharaldsson 718 196 12ms 13 Feb 2026 310th Ripick 718 203 376ms 15 Aug 2024 311th HumanoidCPU 715 197 11ms 13 Sep 2024 311th klixel 🇨🇦 715 197 11ms 19 Jul 2025 311th vhoulbreque 🇫🇷 715 197 11ms 26 Nov 2025 314th KatieLG 🇬🇧 711 198 11ms 12 Jan 2025 314th Bmrl7 711 198 12ms 23 Nov 2025 316th emgordon154 708 131 39ms 23 Nov 2024 317th stefangimmillaro 706 162 10ms 5 Nov 2023 318th btjones0 704 200 14ms 7 Nov 2023 319th annaproxy 703 244 22ms 1 Nov 2023 320th helbling 🇨🇭 702 163 11ms 23 Sep 2024 First Prev 241–320 of 523 Next Last