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?
τ 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 zacjl 909 74 57ms 16 May 2025 242nd pardouin 🇫🇷 909 77 2,771ms 30 Nov 2024 243rd ovs-code 🇩🇪 909 130 4,323ms 18 Oct 2024 244th nwellnhof 🇩🇪 909 131 656ms 25 Sep 2025 245th HPWiz 🇳🇿 908 64 184ms 21 Dec 2024 245th zacjl 908 64 234ms 9 May 2025 247th sean-niemann 🇺🇸 908 93 741ms 25 Jun 2025 247th Steffan153 🇫🇮 908 93 801ms 11 Feb 2026 249th JayXon 🇺🇸 908 110 478ms 27 Dec 2025 250th sean-niemann 🇺🇸 907 72 164ms 13 Jul 2023 250th ovs-code 🇩🇪 907 72 142ms 4 Aug 2024 252nd Alex-x90 🇺🇸 906 43 245ms 25 Nov 2022 252nd FlorianCassayre 🇫🇷 906 43 1,972ms 2 Sep 2023 254th primo-ppcg 🇹🇭 906 153 141ms 5 Apr 2025 255th GrayJoKing 🇦🇺 903 54 498ms 13 Sep 2024 256th Constructor7 903 70 18ms 19 Mar 2018 256th RDShah 903 70 19ms 11 Jun 2022 256th inventshah 903 70 20ms 11 Jun 2022 256th bricknellj 903 70 11ms 6 Mar 2023 256th jared-hughes 903 70 12ms 14 Sep 2023 256th Herbert00709 🇵🇱 903 70 17ms 6 May 2024 256th lifthrasiir 🇰🇷 903 70 14ms 7 Dec 2024 263rd JayXon 🇺🇸 903 105 134ms 16 Oct 2022 264th Lydxn 🇨🇦 902 69 3,350ms 5 Aug 2023 265th MeWhenI 🇻🇦 902 77 18ms 26 Apr 2024 266th JayXon 🇺🇸 902 121 225ms 1 May 2023 266th DialFrost 🇸🇬 902 121 231ms 24 Mar 2025 268th KasperKivimaeki 🇫🇮 902 131 108ms 21 Nov 2025 269th sean-niemann 🇺🇸 901 109 1,325ms 15 Jul 2025 270th argusdusty 🇺🇸 901 160 314ms 26 Dec 2020 271st HPWiz 🇳🇿 900 143 4,054ms 10 Feb 2026 272nd o0lit3 🇺🇸 899 32 34ms 6 Jan 2022 273rd GrayJoKing 🇦🇺 899 67 417ms 16 Jan 2024 273rd MeWhenI 🇻🇦 899 67 430ms 17 Jan 2024 273rd m-tkach 🇺🇦 899 67 393ms 20 Jan 2024 273rd Steffan153 🇫🇮 899 67 433ms 20 Jan 2024 273rd emgordon154 899 67 423ms 12 Sep 2024 273rd CaedenHarper 🇨🇦 899 67 419ms 11 Aug 2025 279th sean-niemann 🇺🇸 899 111 476ms 7 Aug 2023 280th primo-ppcg 🇹🇭 899 149 271ms 20 Jan 2022 281st nwellnhof 🇩🇪 898 50 341ms 5 Dec 2022 282nd primo-ppcg 🇹🇭 898 112 58ms 26 Apr 2025 283rd primo-ppcg 🇹🇭 898 132 74ms 21 Jun 2022 284th GrayJoKing 🇦🇺 898 147 656ms 2 Feb 2024 285th sean-niemann 🇺🇸 897 36 55ms 22 Jul 2022 285th emgordon154 897 36 173ms 10 Sep 2025 285th CornerMercury 🇬🇧 897 36 58ms 1 Dec 2025 288th rucin93 🇵🇱 897 66 176ms 14 Mar 2025 288th sean-niemann 🇺🇸 897 66 165ms 28 Apr 2025 290th Steffan153 🇫🇮 897 105 689ms 11 Feb 2026 290th sean-niemann 🇺🇸 897 105 566ms 15 Feb 2026 292nd primo-ppcg 🇹🇭 896 112 9ms 5 Oct 2020 293rd primo-ppcg 🇹🇭 896 226 4,056ms 6 Jun 2021 294th sean-niemann 🇺🇸 895 123 260ms 23 Dec 2025 294th GrayJoKing 🇦🇺 895 123 259ms 25 Dec 2025 294th Steffan153 🇫🇮 895 123 264ms 18 Feb 2026 297th GrayJoKing 🇦🇺 893 41 14ms 20 Nov 2020 298th sean-niemann 🇺🇸 893 125 497ms 27 Mar 2025 299th GrayJoKing 🇦🇺 892 149 2,292ms 7 Feb 2024 300th ovs-code 🇩🇪 891 96 522ms 21 Jul 2024 300th Steffan153 🇫🇮 891 96 529ms 21 Jul 2024 302nd nwellnhof 🇩🇪 891 112 425ms 21 Nov 2021 302nd primo-ppcg 🇹🇭 891 112 423ms 21 Nov 2021 304th GrayJoKing 🇦🇺 891 182 185ms 1 Feb 2024 305th Irratix 🇳🇱 890 67 22ms 2 Jun 2022 305th KrausRaus 🇺🇸 890 67 24ms 2 Jun 2022 305th pardouin 🇫🇷 890 67 13ms 27 Sep 2024 305th DialFrost 🇸🇬 890 67 16ms 31 Aug 2025 309th CedricGebistorf 890 71 114ms 6 Mar 2022 309th Irratix 🇳🇱 890 71 23ms 1 Jul 2022 309th Mukundan314 890 71 12ms 19 Sep 2025 312th primo-ppcg 🇹🇭 889 133 70ms 11 Dec 2025 313th primo-ppcg 🇹🇭 888 197 39ms 12 May 2023 314th primo-ppcg 🇹🇭 887 123 473ms 10 Dec 2022 315th sean-niemann 🇺🇸 887 151 406ms 11 Jan 2025 316th jared-hughes 887 282 3,676ms 22 Jul 2023 317th sean-niemann 🇺🇸 886 68 415ms 15 Jan 2024 317th snoozingnewt 🇨🇦 886 68 381ms 20 Feb 2026 319th primo-ppcg 🇹🇭 886 142 106ms 18 Sep 2023 320th IanUtley 885 59 71ms 2 Nov 2022 First Prev 241–320 of 2,378 Next Last