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 400th edsrzf 🇳🇿 847 46 2,090ms 7 Sep 2025 400th Lv0Sys 🇵🇱 847 46 152ms 20 Feb 2026 403rd GrayJoKing 🇦🇺 847 72 122ms 27 May 2022 404th DialFrost 🇸🇬 847 112 117ms 23 Mar 2025 405th GrayJoKing 🇦🇺 846 48 70ms 15 Jun 2021 406th pardouin 🇫🇷 846 70 146ms 27 Sep 2024 407th Herbert00709 🇵🇱 844 140 70ms 25 Oct 2024 408th emgordon154 844 177 1,742ms 24 Dec 2025 409th b10011 🇫🇮 843 75 10ms 8 Jan 2023 409th SB-945 843 75 11ms 1 Feb 2024 409th FortuiteMan 🇫🇷 843 75 11ms 1 Sep 2025 409th dokutan 843 75 11ms 14 Feb 2026 413th annaproxy 842 62 530ms 3 Aug 2023 414th Kacarott 🇦🇺 841 58 491ms 13 Sep 2024 415th primo-ppcg 🇹🇭 841 157 531ms 16 Jan 2021 416th fuzzylojik-golf 🇺🇸 840 71 14ms 2 Sep 2025 417th MeWhenI 🇻🇦 838 102 542ms 28 Feb 2022 417th emgordon154 838 102 494ms 25 May 2025 419th sean-niemann 🇺🇸 838 141 75ms 25 Jun 2025 420th namelessiw 837 72 438ms 5 Mar 2024 421st SirBogman 🇺🇸 836 120 12ms 7 Jul 2023 422nd jslip 835 59 14ms 25 May 2022 422nd ovs-code 🇩🇪 835 59 18ms 11 Mar 2023 422nd Steffan153 🇫🇮 835 59 15ms 12 Mar 2023 422nd xsot 🇸🇬 835 59 11ms 6 Oct 2024 426th jared-hughes 833 142 72ms 7 Feb 2023 427th marcin7Cd 832 76 16ms 4 Feb 2021 427th namelessiw 832 76 19ms 3 Dec 2023 427th andrewjc2000 832 76 11ms 21 Mar 2025 427th solisolu 832 76 26ms 16 Nov 2025 427th YAJUE114514 832 76 12ms 11 Dec 2025 432nd emplv 🇱🇻 832 114 128ms 2 Jan 2023 433rd ovs-code 🇩🇪 832 118 3,224ms 16 Aug 2023 434th namelessiw 832 120 399ms 22 Jul 2025 435th Andriamanitra 🇫🇮 829 47 191ms 23 Sep 2022 435th neel11235813 829 47 203ms 14 Feb 2023 435th voytxt 🇨🇿 829 47 2,125ms 22 May 2023 438th GrayJoKing 🇦🇺 829 143 68ms 2 Feb 2024 439th Herbert00709 🇵🇱 828 39 58ms 5 May 2024 440th primo-ppcg 🇹🇭 828 49 49ms 5 Oct 2020 440th ovs-code 🇩🇪 828 49 76ms 22 Oct 2023 442nd DialFrost 🇸🇬 825 73 491ms 15 Jan 2024 443rd Shanethegamer 🇺🇸 825 115 143ms 14 Oct 2022 444th Steffan153 🇫🇮 824 74 100ms 10 Feb 2024 445th nwellnhof 🇩🇪 823 122 10ms 5 May 2020 445th sean-niemann 🇺🇸 823 122 23ms 25 Jun 2025 445th jared-hughes 823 122 33ms 23 Sep 2025 448th emgordon154 822 72 149ms 15 Nov 2024 449th LogicalJoe 821 77 19ms 10 Nov 2022 449th stefangimmillaro 821 77 11ms 19 Dec 2022 449th snydej 821 77 12ms 3 Dec 2024 449th moustave 821 77 11ms 14 Mar 2025 449th jatloe 821 77 11ms 17 Mar 2025 454th SirBogman 🇺🇸 821 144 61ms 27 May 2023 455th fuzzylojik-golf 🇺🇸 821 145 565ms 24 Sep 2025 455th DialFrost 🇸🇬 821 145 550ms 25 Sep 2025 457th DialFrost 🇸🇬 818 56 1,224ms 31 Aug 2025 458th stefangimmillaro 818 122 423ms 1 Aug 2023 458th CaedenHarper 🇨🇦 818 122 404ms 21 Oct 2025 460th AlephSquirrel 817 73 13ms 10 Feb 2023 460th KingSkyrock 🇺🇸 817 73 14ms 14 Oct 2024 462nd SirBogman 🇺🇸 816 55 1,119ms 26 Oct 2021 463rd DialFrost 🇸🇬 816 94 76ms 23 Mar 2025 464th rhdqor213 816 123 20ms 27 Jun 2024 465th dokutan 814 74 392ms 14 Feb 2026 466th nwellnhof 🇩🇪 812 50 63ms 1 May 2020 467th nwellnhof 🇩🇪 812 62 320ms 1 Nov 2021 467th SirBogman 🇺🇸 812 62 343ms 11 Aug 2023 469th rifatx 812 123 452ms 14 Jul 2024 470th MeWhenI 🇻🇦 811 117 124ms 15 Oct 2022 471st RaBa21 🇭🇺 810 78 13ms 19 Jul 2025 472nd sean-niemann 🇺🇸 810 147 546ms 25 Sep 2025 473rd MeWhenI 🇻🇦 810 178 307ms 9 Feb 2023 474th GrayJoKing 🇦🇺 809 124 29ms 19 Jun 2024 474th ovs-code 🇩🇪 809 124 14ms 9 Dec 2025 476th billings7 🇬🇧 805 124 429ms 21 Nov 2021 476th annaproxy 805 124 407ms 20 Aug 2022 478th saito-ta 🇯🇵 803 118 4,745ms 8 Nov 2023 479th Herbert00709 🇵🇱 803 125 13ms 25 Jan 2025 480th m-tkach 🇺🇦 803 202 124ms 17 Dec 2023 First Prev 401–480 of 2,378 Next Last